Mastering Biology Chapter 12

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In the figure above, mitosis is represented by which number?

D. IV

If a pharmaceutical company wished to design a drug to maintain low blood sugar levels, one approach might be to design a compound

E) All of the above are possible approaches.

the best conclusion concerning the difference between the S phases for beta and gamma is
that

A) gamma contains more DNA than beta

Which number represents DNA synthesis

B) II

Which of the following best describes a karyotype?

C. a display of each of the chromosomes of a single cell

At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?

B) Metaphase

Which diagram(s) represent anaphase II of meiosis?

V only

Which of the following occurs in meiosis but not in mitosis?

both B and D
(synapsis and alignment of tetrads at metaphase plate)

Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because

C) they amplify the original signal manyfold.

The function of phosphatases in signal transduction is best described as to

A) inactivate protein kinases and turn off the signal transduction.

47) Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesions. Such molecules must have which of the following properties?

A. They must be removed before anaphase can occur.

Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of

cAMP.

The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following?

Either anaphase 1 or 2

What is the correct chromosomal condition for one daughter nucleus at telophase of mitosis?
Which of the following is true of a species that has a chromosome number of 2n = 16?
All cell cycle checkpoints are similar in which way?

...E

One of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?

D) receptor tyrosine kinases

When we see chiasmata under a microscope, that lets us know which of the following has occurred?

prophase I

MPF reaches its threshold concentration at the end of this stage.

...

A drug designed to inhibit the response of cells to testosterone would almost certainly result in which of the following?

...

The beginning of anaphase is indicated by which of the following?

D. Cohesin is cleaved

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

...B) Golgi-derived vesicles

The MPF protein complex turns itself off by

...A) activating a process that destroys cyclin components.

The beginning of anaphase is indicated by which of the following?

D. Cohesin is cleaved

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

D. Golgi-derived vesicles

44) Independent assortment of chromosomes is a result of

...

Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

..., cyclin

If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?

...

Which of the following is characterized by a cell releasing a signal molecule into the environment , followed by a number of cells in the immediate vicinity responding?

...

44) Which of the steps take place in both mitosis and meiosis?

...

The toxin of Vibrio cholerae causes profuse diarrhea because it

...A) modifies a G protein involved in regulating salt and water secretion.

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis. Specifically, taxol must affect

E. the formation of the mitotic spindle.

Movement of the chromosomes during anaphase would be most affected by a drug that prevents

..., Shortening of microtubules

Which of the following would be inhibited by a drug that specifically blocks the addition of phosphate groups to proteins?

..., receptor tyrosine kinase activity

Using which of the following techniques would enable your lab group to distinguish between a cell in G2 and a cell from the same organism in G1

...C. receptor tyrosine kinase activity

To view and analyze human chromosomes in a dividing cell, which of the following is/are required?

..., DNA stain and a light microscope

Which of the following is a true statement about sexual vs. asexual reproduction?

..., In sexual reproduction, individuals transmit 50% of their genes to each of their offspring

If a cell has completed the first meiotic division and is just beginning meiosis II, which of the following is an appropriate description of its contents?

..., It has half the amount of DNA as the cell that began meiosis.

In which of the following ways do plant hormones differ from hormones in animals?

...B. Plant hormones may travel in air or through vascular systems

In yeast signal transduction, a yeast cell

...C. secretes molecules that result in responses by other yeast cells.

A female with a paternal set of one orange and one long gene chromosome and a maternal set comprised of one blue and one short gene chromosome is expected to produce which of the following types of eggs after meiosis?

D) Each egg has 1/4 chance of having blue long, blue short, orange long, or orange short combinations.

Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that

..., A) gamma contains more DNA than beta.

31) If an organism is diploid and a certain gene found in the organism has 18 known alleles (variants), then any given organism of that species can/must have which of the following?

...A) At most, 2 alleles for that gene

37) Density-dependent inhibition is explained by which of the following?

...Density-dependent inhibition is explained by which of the following?
A) As cells become more numerous, they begin to squeeze against each other, restricting their size and
ability to produce control factors.
B) As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they
stop dividing.

There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome by excessive mutations.

crossing over of homologs

Which of the following is true of a species that has a chromosome number of 2n = 16? All cell cycle checkpoints are similar in which way?

...

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