Question 1

The illustration below shows a summary of the events in the life cycle of a human. Which of the lettered transitions or events require mitosis?

Accepted Answer

A) all but F 
B) A, B, and C 
C) D and E 
D) F only 
A) all but F 
B) A, B, and C 
C) D and E 
D) F only B

Question 2

When examining the rapidly dividing cells of the onion root tip, you see a cell whose chromosomes are visible and are arranged in approximately the same size and shape as the nucleus. What stage of mitosis is this cell in?

Accepted Answer

A) metaphase 
B) prophase 
C) anaphase 
D) telophase 
A) metaphase 
B) prophase 
C) anaphase 
D) telophase B

Question 3

The successful union of one male and one female gamete forms a new single cell known as a

Accepted Answer

A) histone. 
B) zygote. 
C) vesicle. 
D) gametocyte. 
A) histone. 
B) zygote. 
C) vesicle. 
D) gametocyte. B

Question 4

Many honeybee species are parthenogenic; unfertilized halpoid ____________________ develop to become haploid male bees called drones.

Accepted Answer

The answer of Many honeybee species are parthenogenic; unfertilized halpoid...

Question 5

Both meiosis I and meiosis II decrease the number of chromosomes found in a cell.

Accepted Answer

A) True 
 B)False

Question 6

The attachment of microtubules to the centromeres of chromosomes during ____________________ of mitosis sets the stage for the positioning of the chromosomes at the metaphase plate.

Accepted Answer

The answer of The attachment of microtubules to the centromeres...

Question 7

What feature(s)distinguish an embryo from a zygote?

Accepted Answer

A) The cells of an embyro are diploid, whereas those of the zygote are haploid. 
B) A zygote consists of a single cell, whereas an embryo is multicellular. 
C) An embryo has differentiated to the extent that rudimentary organs are present, whereas a zygote's cells are still undifferentiated. 
D) both a and c 
A) The cells of an embyro are diploid, whereas those of the zygote are haploid. 
B) A zygote consists of a single cell, whereas an embryo is multicellular. 
C) An embryo has differentiated to the extent that rudimentary organs are present, whereas a zygote's cells are still undifferentiated. 
D) both a and c

Question 8

Why must DNA be packed into chromosomes before mitosis or meiosis can occur?

Accepted Answer

A) In their unpacked state, the strands of DNA would be difficult to pull apart during cell division. 
B) The zygote would be unable to live if the DNA were not packed into chromosomes. 
C) We would be unable to see the karyotype if the DNA were not packed into chromosomes. 
D) Some of the genes would escape during cell division if they were not packed tightly into chromosomes. 
A) In their unpacked state, the strands of DNA would be difficult to pull apart during cell division. 
B) The zygote would be unable to live if the DNA were not packed into chromosomes. 
C) We would be unable to see the karyotype if the DNA were not packed into chromosomes. 
D) Some of the genes would escape during cell division if they were not packed tightly into chromosomes.

Question 9

The daughter cells of meiosis I are haploid.

Accepted Answer

A) True 
 B)False

Question 10

The parthenogenetic whiptail lizards of the desert Southwest create no new genetic combinations during crossing-over, like other animals, because

Accepted Answer

A) all the crosses are double, eventually restoring each chromosome to its original condition. 
B) they possess no homologous chromosomes; crossing-over in this species occurs between genetically identical sister chromatids. 
C) parthenogenetic species forgo meiosis I, when crossing-over normally occurs. 
D) accumulated mutation within the species has modified the centromeres, disrupted the formation of a bivalent, and prevented crossing-over from taking place. 
A) all the crosses are double, eventually restoring each chromosome to its original condition. 
B) they possess no homologous chromosomes; crossing-over in this species occurs between genetically identical sister chromatids. 
C) parthenogenetic species forgo meiosis I, when crossing-over normally occurs. 
D) accumulated mutation within the species has modified the centromeres, disrupted the formation of a bivalent, and prevented crossing-over from taking place.

Question 11

Sexual and asexual reproduction can both offer distinct advantages under certain circumstances. In which of the following situations would asexual reproduction be disadvantageous?

Accepted Answer

A) Decomposers discover a dolphin carcass that had recently drifted to the ocean floor. 
B) A persistently cooling climate results in a significant increase in average winter snow depth. 
C) A cut breaches the defensive ability of the skin and infectious pathogens invade the injury. 
D) Coastal currents, water temperature, nutrient concentrations, and light intensity temporarily combine to produce ideal growth conditions for marine phytoplankton. 
A) Decomposers discover a dolphin carcass that had recently drifted to the ocean floor. 
B) A persistently cooling climate results in a significant increase in average winter snow depth. 
C) A cut breaches the defensive ability of the skin and infectious pathogens invade the injury. 
D) Coastal currents, water temperature, nutrient concentrations, and light intensity temporarily combine to produce ideal growth conditions for marine phytoplankton.

Question 12

Cytokinesis occurs during interphase.

Accepted Answer

A) True 
 B)False

Question 13

Gametes are produced by meiosis rather than mitosis because

Accepted Answer

A) mitosis would produce too many sister cells. 
B) meiosis reduces the chromosome number so that zygotes produced will have one full genome. 
C) meiosis doubles the chromosome number so that each gamete has twice the usual number of genes. 
D) meiosis ensures that the gametes are identical to the cell that produced them. 
A) mitosis would produce too many sister cells. 
B) meiosis reduces the chromosome number so that zygotes produced will have one full genome. 
C) meiosis doubles the chromosome number so that each gamete has twice the usual number of genes. 
D) meiosis ensures that the gametes are identical to the cell that produced them.

Question 14

The most critical stage of interphase for a cell that needs to undergo cell division is the ____________________ phase. If the cell does not complete this phase, it cannot undergo DNA segregation.

Accepted Answer

The answer of The most critical stage of interphase for...

Question 15

The random distribution of chromosomes into daughter cells during ____________________ of meiosis is one way to create genetic diversity.

Accepted Answer

The answer of The random distribution of chromosomes into daughter...

Question 16

An unduplicated chromosome contains

Accepted Answer

A) two sister chromatids. 
B) a single molecule of DNA combined with a large number of proteins. 
C) the cell's karyotype. 
D) its own spindle poles. 
A) two sister chromatids. 
B) a single molecule of DNA combined with a large number of proteins. 
C) the cell's karyotype. 
D) its own spindle poles.

Question 17

Which of the following foods is most likely to contain haploid cells?

Accepted Answer

A) a sirloin steak 
B) an apple 
C) an egg 
D) a stalk of celery 
A) a sirloin steak 
B) an apple 
C) an egg 
D) a stalk of celery

Question 18

Cancers are groups of cells that divide rapidly and uncontrollably. Thus cancer cells

Accepted Answer

A) are always in the G0 phase. 
B) never enter the cell cycle. 
C) have a relatively short G1 phase and ignore the G1 and G2 checkpoints. 
D) are stuck at the metaphase plate. 
A) are always in the G0 phase. 
B) never enter the cell cycle. 
C) have a relatively short G1 phase and ignore the G1 and G2 checkpoints. 
D) are stuck at the metaphase plate.

Question 19

During meiosis I, the microtubules from only one spindle pole attach to only one member of a bivalent.

Accepted Answer

A) True 
 B)False

Question 20

The cell depicted below has a diploid number of 8 (2n = 8).  
Assuming cell division started with a diploid cell, in what stage of what type of cell division is the cell?

Accepted Answer

A) anaphase of mitosis 
B) anaphase I of meiosis 
C) anaphase II of meiosis 
D) Both a and c are possible. 
A) anaphase of mitosis 
B) anaphase I of meiosis 
C) anaphase II of meiosis 
D) Both a and c are possible.

Exam 10: Cell Division

The illustration below shows a summary of the events in the life cycle of a human. Which of the lettered transitions or events require mitosis?

When examining the rapidly dividing cells of the onion root tip, you see a cell whose chromosomes are visible and are arranged in approximately the same size and shape as the nucleus. What stage of mitosis is this cell in?

The successful union of one male and one female gamete forms a new single cell known as a

Many honeybee species are parthenogenic; unfertilized halpoid ____________________ develop to become haploid male bees called drones.

Both meiosis I and meiosis II decrease the number of chromosomes found in a cell.

The attachment of microtubules to the centromeres of chromosomes during ____________________ of mitosis sets the stage for the positioning of the chromosomes at the metaphase plate.

What feature(s)distinguish an embryo from a zygote?

Why must DNA be packed into chromosomes before mitosis or meiosis can occur?

The daughter cells of meiosis I are haploid.

The parthenogenetic whiptail lizards of the desert Southwest create no new genetic combinations during crossing-over, like other animals, because

Sexual and asexual reproduction can both offer distinct advantages under certain circumstances. In which of the following situations would asexual reproduction be disadvantageous?

Cytokinesis occurs during interphase.

Gametes are produced by meiosis rather than mitosis because

The most critical stage of interphase for a cell that needs to undergo cell division is the ____________________ phase. If the cell does not complete this phase, it cannot undergo DNA segregation.

The random distribution of chromosomes into daughter cells during ____________________ of meiosis is one way to create genetic diversity.

An unduplicated chromosome contains

Which of the following foods is most likely to contain haploid cells?

Cancers are groups of cells that divide rapidly and uncontrollably. Thus cancer cells

During meiosis I, the microtubules from only one spindle pole attach to only one member of a bivalent.

The cell depicted below has a diploid number of 8 (2n = 8). Assuming cell division started with a diploid cell, in what stage of what type of cell division is the cell?

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