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Andrea
Andrea, Graduate Student
Category: Homework
Satisfied Customers: 187
Experience:  Doctoral Candidate and Adjunct Prof. of Biology
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Hi are there any biology experts available

Resolved Question:

Hi are there any biology experts available?
Submitted: 5 years ago.
Category: Homework
Expert:  asciandwildlifebio replied 5 years ago.
Hello lekpeh, please post your question.
Customer: replied 5 years ago.

Hi,

Thanks for taking my question.

I would like to know when you are online, so we can work together, because 10 hrs and 36 minutes later is a little too late for the question I had, however, I would like to be online when you are on.

 

Thanks, XXXXX XXXXX look forward to working with you.

Expert:  asciandwildlifebio replied 5 years ago.
Lekpeh, I am online as much as I can be. If you post your question, an expert will get to it as soon as possible. If you would like me to answer it you can always request me, or put my username in the title of your question. I look forward to working with you. And, just as a heads-up I will be away this weekend. Also, it's best to post upcoming assignments ahead of time so experts can double check details of the assignment and be as complete and comprehensive as possible.
Customer: replied 5 years ago.

Hi asciandwildlifebio,

are you available to help me please?

Expert:  Andrea replied 5 years ago.

HelloCustomer

 

I am a biology expert and I can help you, if you'd like. Asciandwildlifebio opted out of this question, so she has allowed other experts to help you.

 

I am not available this weekend, but I can be online on Monday morning around 9:30am or in the afternoon around 3pm, depending on which you prefer. If you need help sooner, I can opt out and allow another expert to help you.

 

You could also post your question and let me know when you need the answer by, which would allow me to start working on the question if you are not online. It's up to you!

 

Thanks!

AndreaSBP

Customer: replied 5 years ago.
Part A
Which of the following is a function of meiosis but not mitosis in eukaryotes? (Concept 12.1)
Hint A.1

Hint not displayed

ANSWER:
repair of damaged organs
cell replacement
asexual reproduction
production of animal gametes
growth

Answer not displayed

Part B
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain? (Concept 12.1)
Hint B.1

Hint not displayed

ANSWER:
23
46
92
23 or 46, depending on the portion of prophase examined
46 or 92, depending on the portion of prophase examined

Answer not displayed

Part C
It is difficult to observe individual chromosomes with a light microscope during interphase because _____. (Concept 12.1)
Hint C.1

Hint not displayed

ANSWER:
they have uncoiled to form long, thin strands
the DNA has not been replicated yet
sister chromatids do not pair up until division starts
the spindle must move them to the metaphase plate before they become visible
they leave the nucleus and are dispersed to other parts of the cell

Answer not displayed

Part D
The kinetochores _____. (Concept 12.2)
Hint D.1

Hint not displayed

ANSWER:
attach to the ring of actin along the cytoplasmic surface of the plasma membrane, causing the actin to contract to form the cleavage furrow
are located at the center of the centrosome; their function is to organize tubulin into elongated bundles called spindle fibers
of each spindle interdigitate at the cell's equator and then move apart, causing the cell to elongate
are sites at which microtubules attach to chromosomes
are the primary centromere structures that maintain the attachment of the sister chromatids prior to mitosis

Answer not displayed

Part E
Which of the following correctly matches a phase of the cell cycle with its description? (Concept 12.2)
Hint E.1

Hint not displayed

ANSWER:
G2: cell division
G1: follows cell division
M: duplication of DNA
S: immediately precedes cell division
All of the above are correctly matched.

Answer not displayed

Part F
In some organisms such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this? (Concept 12.2)
Hint F.1

Hint not displayed

ANSWER:
a decrease in chromosome number
large cells containing many nuclei
inability to duplicate DNA
a rapid rate of gamete production
division of the organism into many cells, most lacking nuclei

Answer not displayed

Part G
Which of the following is/are difference(s) between the fission of a bacterium and mitosis in human cells? (Concept 12.2)
Hint G.1

Hint not displayed

ANSWER:
Bacteria are smaller and simpler than human cells.
A bacterium has only one chromosome, human chromosomes are paired.
Human chromosomes are larger and more complex.
Duplicated bacterial chromosomes attach to the plasma membrane. Duplicated human chromosomes are attached to each other.
All of the above are differences between the fission of a bacterium and human cell division.

Answer not displayed

Part H
Cytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere with _____. (Concept 12.2)
Hint H.1

Hint not displayed

ANSWER:
cleavage
binary fission
formation of the mitotic spindle
formation of the cell plate
DNA replication

Answer not displayed

Part I
Cells will usually divide if they receive the proper signal at a checkpoint in the _____ phase of the cell cycle. (Concept 12.3)
Hint I.1

Hint not displayed

ANSWER:
cytokinesis
S
G1
G2
M

Answer not displayed

Part J
A benign tumor, but not a malignant tumor, is one in which the cancerous cells _____. (Concept 12.3)
Hint J.1

Hint not displayed

ANSWER:
have an unusual number of chromosomes
migrate from the initial site of transformation to other organs or tissues
remain confined to their original site
are the result of the transformation of normal cells
can divide indefinitely if an adequate supply of nutrients is available

Answer not displayed

Score Summary: Your score on this assignment is 0%.
You received 0 out of a possible total of 10 points.
Customer: replied 5 years ago.

Hi Andrea,

I have 50 questions, and I need the answers by mid night on friday 7/6/09.

Please let me know if you have time to complete them or not.

I just sent you the first 10 of the 50.

I am going to send 10 at a time cuz that is all I am able to post.

Also, please let me know if you are able to view them or not.

 

 

Thanks

Customer: replied 5 years ago.

sorry. I meant monday 7/6/09

here is the second set, the third, fourth, and fifth will follow, please watch for them.

Part A
Asexual reproduction _____. (Concept 13.1)
Hint A.1

Hint not displayed

ANSWER:
is limited to plants
requires both meiosis and mitosis
produces offspring genetically identical to the parent
leads to a loss of genetic material
is limited to single-cell organisms

Answer not displayed

Part B
A human somatic cell contains _____. (Concept 13.1)
Hint B.1

Hint not displayed

ANSWER:
45 autosomes and 1 sex chromosome
44 autosomes and 2 sex chromosomes
22 autosomes and 1 sex chromosome
n chromosomes
21 autosomes and 2 sex chromosomes

Answer not displayed

Part C
For what purpose might a karyotype be prepared? (Concept 13.2)
Hint C.1

Hint not displayed

ANSWER:
for prenatal screening, to determine if a fetus has the correct number of chromosomes
to determine whether a fetus is male or female
to detect the possible presence of chromosomal abnormalities such as deletions, inversions, or translocations
The first and second answers are correct.
The first three answers are correct.

Answer not displayed

Part D
In alternation of generations, the diploid stage of a plant that follows fertilization is the _____. (Concept 13.2)
Hint D.1

Hint not displayed

ANSWER:
gametophyte
chiasmata
sporophyte
spore
karyotype

Answer not displayed

Part E
How are sister chromatids and homologous chromosomes different from each other? (Concepts 13.2 and 13.3)
Hint E.1

Hint not displayed

ANSWER:
They are not different. Homologous chromosomes and sister chromatids are both identical copies of each other.
Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.
Homologous chromosomes are identical copies of each other. One sister chromatid comes from the father, and one comes from the mother.
Sister chromatids are only formed during mitosis. Homologous chromosomes are formed during meiosis.
Homologous chromosomes are closely associated with each other in both mitosis and meiosis. Sister chromatids are only associated with each other during mitosis.

Answer not displayed

Part F
Mitosis results in the formation of _____; meiosis results in the formation of _____. (Concept 13.3)
Hint F.1

Hint not displayed

ANSWER:
two diploid cells ... two diploid cells
two diploid cells ... four haploid cells
four haploid cells ... two diploid cells
two diploid cells ... two haploid cells
four diploid cells ... four haploid cells

Answer not displayed

Part G
Which of the following occurs during meiosis but not during mitosis? (Concept 13.3)
Hint G.1

Hint not displayed

ANSWER:
A spindle apparatus forms.
Synapsis occurs.
Chromosomes migrate to opposite poles.
Chromosomes condense.
Chromosomes align at the metaphase plate.

Answer not displayed

Part H
Crossing over is _____. (Concept 13.3)
Hint H.1

Hint not displayed

ANSWER:
also referred to as the "independent assortment of chromosomes"
a direct consequence of the separation of sister chromatids
the movement of genetic material from one chromosome to a nonhomologous chromosome
making an RNA copy of a DNA strand
the exchange of homologous portions of nonsister chromatids

Answer not displayed

Part I
Genetic variation occurs when chromosomes are shuffled in _____ and fertilization. (Concept 13.4)
Hint I.1

Hint not displayed

ANSWER:
genetic drift
meiosis
mitosis
natural selection
mutation

Answer not displayed

Part J
Heritable variation is required for _____. (Concept 13.4)
Hint J.1

Hint not displayed

ANSWER:
evolution
meiosis
asexual reproduction
the production of a clone
mitosis

Answer not displayed

Score Summary: Your score on this assignment is 0%.
You received 0 out of a possible total of 10 points.

 

 

Customer: replied 5 years ago.
Part A
In his breeding experiments, Mendel first crossed true-breeding _____ generation plants to produce the _____ generation, which were then allowed to self-pollinate to generate the _____ offspring. (Concept 14.1)
Hint A.1

Hint not displayed

ANSWER:
P1 ... P2 ... F
P1 ... P2 ... P3
F ... P1 ... P2
F1 ... F2 ... F3
P ... F1 ... F2

Answer not displayed

Part B
A plant with the genotype AABbcc _____. (Concept 14.1)
Hint B.1

Hint not displayed

ANSWER:
Will not express the recessive c allele.
is heterozygous at two loci
is triploid
has recessive alleles at three loci
is homozygous at two loci

Answer not displayed

Part C
An allele is _____. (Concept 14.1)
Hint C.1

Hint not displayed

ANSWER:
the dominant form of a gene
the recessive form of a gene
an alternative version of a gene
a type of chromosome
a variety of pea plant used by Mendel

Answer not displayed

Part D
GgTt pea plants can produce _____ type(s) of gametes, but a ggtt plant can produce _____ type(s) of gametes. (Concept 14.2)
Hint D.1

Hint not displayed

ANSWER:
one ... one
four ... two
four ... one
one ... two
two... one

Answer not displayed

Part E
Two organisms with genotype AaBbCcDdEE mate. These loci are all independent. What fraction of the offspring will have the same genotype as the parents? (Concept 14.2)
Hint E.1

Hint not displayed

ANSWER:
3/4
1/4
4/3
1/16
9/64

Answer not displayed

Part F
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one. All of the F1 are pink. What does this say about the alleles for the parental traits? (Concept 14.3)
Hint F.1

Hint not displayed

ANSWER:
Red and white are codominant.
Red shows incomplete dominance over white.
Red is completely dominant.
Both red and white are pleiotropic.
Pink is dominant, while red and white are recessive.

Answer not displayed

Part G
Height in humans generally shows a normal (bell-shaped) distribution. What type of inheritance most likely determines height? (Concept 14.3)
Hint G.1

Hint not displayed

ANSWER:
A combination of epistasis and environmental factors.
A combination of multiple alleles and codominance
incomplete dominance
A combination of complete dominance and environmental factors.
A combination of polygenic inheritance and environmental factors.

Answer not displayed

Part H
Folk singer Woody Guthrie died of Huntington's disease, an autosomal dominant disorder. Which statement below must be true? (Concept 14.4)
Hint H.1

Hint not displayed

ANSWER:
His daughters will die of Huntington's disease but not his sons.
At least one of Woody Guthrie's parents must also have had the allele for Huntington's disease.
All of his children will develop Huntington's disease.
His sons will develop Huntington's disease but not his daughters.
There is not enough information to answer the question.

Answer not displayed

Part I
Various procedures can be used to detect genetic disorders before birth. Among the tests discussed in this chapter, _____ is the least invasive, while _____ and _____ allow the chromosomes of the fetus to be examined. (Concept 14.4)
Hint I.1

Hint not displayed

ANSWER:
amniocentesis ... fetoscopy ... chorionic villus sampling
ultrasound imaging ... fetoscopy... amniocentesis
amniocentesis ... ultrasound imaging ... chorionic villus sampling
ultrasound imaging ... chorionic villus sampling ... amniocentesis
chorionic villus sampling ... fetoscopy ... amniocentesis

Answer not displayed

Part J
If an individual is heterozygous for the sickle-cell trait _____. (Concept 14.4)
Hint J.1

Hint not displayed

ANSWER:
he or she will show no symptoms of the disease because the allele that causes sickle-cell disease is recessive
he or she will not develop full-blown sickle-cell disease but may show symptoms under certain circumstances
he or she will have full-blown sickle-cell disease because the allele is dominant
he or she will be more apt to acquire a serious case of malaria
none of the above

Answer not displayed

Score Summary: Your score on this assignment is 0%.
You received 0 out of a possible total of 10 points.
Customer: replied 5 years ago.
Part A
Mendel's Principle of Segregation can be visualized when we observe _____. (Concept 15.1)
Hint A.1

Hint not displayed

ANSWER:
Sister chromatids separating during mitosis.
Homologous chromosomes separating during Meiosis I.
The behavior of sex-linked genes.
Homologous chromosomes separating during Meiosis II.
The replication of DNA.

Answer not displayed

Part B
The most common phenotype in a natural population is referred to as the _____. (Concept 15.1)
Hint B.1

Hint not displayed

ANSWER:
mutant phenotype
wild type
autosome
genotype
locus

Answer not displayed

Part C
A white-eyed female Drosophila is crossed with a red-eyed male Drosophila. Which statement below correctly describes the results? (Concept 15.1)
Hint C.1

Hint not displayed

ANSWER:
Twenty-five percent of the females will have white eyes.
None of the females will have red eyes.
None of the females will have white eyes.
Twenty-five percent of the females will have red eyes.
Fifty percent of the females will have red eyes.

Answer not displayed

Part D
In humans, the _____ determines the sex of the offspring because _____. (Concept 15.2)
Hint D.1

Hint not displayed

ANSWER:
female gamete ... only the female gametes can have one of two functional sex chromosomes
male ... the sperm can fertilize either a female egg or a male egg
male gamete ... each male gamete can contribute either an X or a Y chromosome
female gamete ... only the female gamete provides cytoplasm to the zygote
chromosome contribution from both parents ... the offspring uses all the parents' chromosomes

Answer not displayed

Part E
In general, the frequency with which crossing over occurs between two linked genes depends on _____. (Concept 15.3)
Hint E.1

Hint not displayed

ANSWER:
whether the genes are on the X or some other chromosome
how far apart they are on the chromosome
whether the genes are dominant or recessive
the characters the genes code for
the phase of meiosis in which the crossing over occurs

Answer not displayed

Part F
How many map units is a recombination frequency of 5% equal to? (Concept 15.3)
Hint F.1

Hint not displayed

ANSWER:
5 centimorgans
5 centisturtevants
5%
10 centimorgans
2.5 centimorgans

Answer not displayed

Part G
A situation in which chromosome number can be represented as either 2n+1 or 2n-1 is called_____. (Concept 15.4)
Hint G.1

Hint not displayed

ANSWER:
Methylation.
Gene linkage.
inversion.
Polyploidy.
aneuploidy

Answer not displayed

Part H
If a fragment of a chromosome breaks off and then reattaches to the original chromosome at the same place but in the reverse direction, the resulting chromosomal abnormality is called _____. (Concept 15.4)
Hint H.1

Hint not displayed

ANSWER:
a deletion
a translocation
polyploidy
a nondisjunction
an inversion

Answer not displayed

Part I
A particular allele will either be expressed or silenced, depending on whether it is inherited from a male rather than a female. This phenomenon is known as _____. (Concept 15.5)
Hint I.1

Hint not displayed

ANSWER:
aneuploidy
polyploidy
genomic imprinting
extranuclear inheritance
sex linkage

Answer not displayed

Part J
Human mitochondria _____. (Concept 15.5)
Hint J.1

Hint not displayed

ANSWER:
have linear DNA
are inherited as an X-linked trait
are all inherited from the father
are all inherited from the mother
do not contain DNA

Answer not displayed

Score Summary: Your score on this assignment is 0%.
You received 0 out of a possible total of 10 points.
Customer: replied 5 years ago.
Part A
Griffith's experiments with S. pneumoniae were significant not only because they showed that traits could be transferred from one organism to another, but because they showed that _____. (Concept 16.1)
Hint A.1

Hint not displayed

ANSWER:
Heat kills bacteria.
A virus made the bacteria pathogenic.
DNA was the genetic material.
Protein could not be the genetic material.
The transferred traits were heritable.

Answer not displayed

Part B
In the Hershey and Chase experiment that helped confirm that DNA, not protein, was the hereditary material, the key finding was that _____. (Concept 16.1)
Hint B.1

Hint not displayed

ANSWER:
radioactively labeled sulfur was present inside the infected bacteria
radioactively labeled phosphorus was present inside the infected bacteria
radioactively labeled carbon was present inside the infected bacteria
radioactively labeled sulfur was found outside of the infected bacteria
radioactively labeled phosphorus was found outside of the infected bacteria

Answer not displayed

Part C
The X-ray diffraction studies conducted by _____ were key to the discovery of the structure of DNA. (Concept 16.1)
Hint C.1

Hint not displayed

ANSWER:
Griffith
McClintock
Meselson and Stahl
Franklin
Chargaff

Answer not displayed

Part D
DNA replication is said to be semiconservative. This means that _____. (Concept 16.2)
Hint D.1

Hint not displayed

ANSWER:
one of the two resulting double helices is made of two old strands, and the other is made of two new strands
the old double helix is degraded and half of its nucleotides are used in the construction of two new double helices
half of the old strand is degraded and half is used as a template for the replication of a new strand
each new double helix consists of one old and one new strand
one strand of the new double helix is made of DNA and the other strand is made of RNA

Answer not displayed

Part E
What is the function of helicase in DNA replication? (Concept 16.2)
Hint E.1

Hint not displayed

ANSWER:
It relieves strain from twisting of the double helix as it is unwound.
It adds nucleotides to the new strand in the 5' to 3' direction.
It joins together Okazaki fragments.
It checks for errors in the newly synthesized DNA strand.
It untwists the double helix and separates the two DNA strands.

Answer not displayed

Part F
_____ fixes mistakes made during DNA replication; _____ repairs damage to a preexisting double helix. (Concept 16.2)
Hint F.1

Hint not displayed

ANSWER:
The leading strand ... the lagging strand
Mismatch repair ... nucleotide excision repair
Operon repair ... histone repair
Proto-oncogene repair ... oncogene
Transformation ... transduction

Answer not displayed

Part G
In nucleotide excision repair, damaged DNA is excised by _____. (Concept 16.2)
Hint G.1

Hint not displayed

ANSWER:
nuclease
restriction enzymes
helicase
ligase
primase

Answer not displayed

Part H
The repetitive DNA sequences present at the ends of eukaryotic chromosomes are called _____. (Concept 16.2)
Hint H.1

Hint not displayed

ANSWER:
telomeres
chromomeres
centromeres
sarcomeres
polypeptides

Answer not displayed

Part I
Chromosomes are made up of _______ (Concept 16.3)
Hint I.1

Hint not displayed

ANSWER:
DNA and euchromatin.
DNA, RNA, and proteins.
DNA, heterochromatin, and histone proteins.
DNA and proteins.
DNA.

Answer not displayed

Part J
During interphase DNA is in the form of ______ and is ______. (Concept 16.3)
Hint J.1

Hint not displayed

ANSWER:
Chromatin; less condensed than mitotic chromosomes.
Highly condensed chromosomes; unavailable for gene expression.
Chromatin; unavailable for gene expression.
Highly condensed chromosomes; called heterochromatin.
Chromatin; completely uncoiled and loose.

Answer not displayed

Score Summary: Your score on this assignment is 0%.
You received 0 out of a possible total of 10 points.
Expert:  Andrea replied 5 years ago.

HelloCustomer

 

I can do this for you, no problem! I'll get started right away.

 

Thanks!

Andrea

Customer: replied 5 years ago.

Thanks for taking my problems, I really appreciate it.

I will keep checking in.

 

Thanks

Expert:  Andrea replied 5 years ago.
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Andrea, Graduate Student
Category: Homework
Satisfied Customers: 187
Experience: Doctoral Candidate and Adjunct Prof. of Biology
Andrea and 3 other Homework Specialists are ready to help you
Customer: replied 5 years ago.

Thanks so much Andrea.

I am going to accept, and appreciate your help.

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