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Chapters 9 and 10

c

What features in prokaryotes substitutes for the spindle action in eukaryotes? A) Centrioles with asters B) fission instead of cytokinesis C) elongation of plasma membrane D) looped DNA E) presence of one chromosome.

b

How does a prokaryotic chromosome differ from a eukaryotic Chromosome? A prokaryotic cell A) is shorter and fatter B) has a single loop od DNA C) never replicates. D) contains many histones E) all of these are correct

e

The diploid number of chromosomes A) is the 2n number. B) is in a parent cell and therefore in the two daughter cells following mitosis. C) varies according to the particular organism. D) is in every somatic cell. E) all of these are correct.

d

Point of attachment for sister chromatids A) Centriole B) chromatid C) chromosome D) centromere E) cyclin

a

Found at a spindle pole in the center of an aster. A) Centriole B) chromatid C) chromosome D) centromere E) cyclin

c

Coiled and condensed chromatin. A) Centriole B) chromatid C) chromosome D) centromere E) cyclin

b

If a parent cell has 14 chromosomes prior to mitosis, how many chromosomes will each daughter cell have? A) 28 b/c each chromatid is a chromosome B) 14 b/c the chromatids seperate. C) Only 7 after mitosis is finished. D) any number between 7 and 28 E) 7 in the nucleus and 7 in the cytoplasm, for a total of 14.

d

In which phase of mitosis are the chromosomes moving toward the poles? A) Prophase B) prometaphase C) metaphase D) anaphase E) telophase

e

telephase A) is the same as prophase, metaphase, anaphase, and telophase B) includes stages G1, S, and G2. C) requires the use of polar spindle fibers and kinetochore spindle fiber D) Is a part of a cell E) both b and d are correct.

b

cytokinesis A) is mitosis in plants B) requires the formation of a cell plate in plants. C) is the longest part of the cell cycle D) is half a chromosome E) is a form of apoptosis.

b

At the metaphase plate during metaphase of mitosis, there are A) single chromosomes B) unpaired duplicated chromosomes C) G1 stage chromosomes D) always 23 chromosomes.

e

A cell plate A) is characteristic of plant cells B) will become the cell wall C) is necessary to the movement of chromosomes. D) helps make the spindle fibers E) both a and b are correct.

c

During which mitotic phases are duplicated chromosomes present? A) All but telophase B) prophase and anaphase C) all but anaphase and telophase D) only during metaphase at the metaphase plate. E) both a and b are correct.

e

Which of these is paired incorrectly? A) prometaphase-the kinetochores become attatched to spindle fibers B) anaphase- daughter chromosomes are located at the spindle poles. C) prophase- the nucleolus dissapears and the nuclear envelope disintegrates. D) metaphase-the chromosomes are aligned in the metaphase plate. E) telophase- a resting phase between cell division cycles.

a

When cancer occurs; A) mutations have occured B) the p53 gene is operational C) apoptosis has occured D) the cells can no longer enter the cell cycle E) all of these are correct.

c

Which of the following is not a characteristic of cancer cells? A) cancer cells often undergo angiogenesis B) cancer cells tend to be nonspecialized C) cancer cells undergo apoptosis. D) cancer cells often have abnormal nuclei. E) cancer cells can metastasize

d

If a cell is cancerous, you mmight find abnormality in A) a receptor protein B) a signaling protein C) genes D) all of these are correct.

b

At the end of this stage, each chromosome consists of two identical DNA molecules. A) G1 stage B) S stage C) G2 stage D) M(mitotic) stage

d

During this stage, daughter chromosomes are distrubuted to two daughter nuclei. A) G1 stage B) S stage C) G2 stage D) M(mitotic) stage

a

The cell doubles its organelles and accumulates the materials needed for DNA synthesis. A) G1 stage B) S stage C) G2 stage D) M(mitotic) stage

a

The cell synthesizes the proteins needed for cell division.A) G1 stage B) S stage C) G2 stage D) M(mitotic) stage

d

Which is not true of the cell cycle? A) The cell cycle is controlled by internal/external signals. B) During the cell cycle, cyclin increases and decreases as the cycle continues. C) DNA damage can stop the cell cycle at the G1 checkpoint. D) apoptosis occurs frequently during the cell cycle.

a

In human beings, mitosis is necassary to; A) Growth and repair of tissues B) formation of the gametes C) maintaining the chromosome number in all body cells D) the death of unnecessary cells. E) both A and C are correct.

b

A bivalent is A) a homologous chromosome B) the paired homologous chromosomes C) a duplicated chromosome composed of sister chromatids D) the two daughter cells after meiosis E) the two centrioles in the centrosome

d

If a parent cell has 12 chromosomes, then each of the daughter cells following meiosis will have A) 48 chromosomes B) 24 chromosomes C) 12 chromosomes D) 6 chromosomes E) any one of these could be correct.

e

At the metaphase plate during metaphase 1 of meiosis, there are A) chromosomes consisting of one chromatid B) unpaired duplicated chromosomes C) bivalents D) homologous pairs of chromosomes E) both c and d are correct.

b

At the metaphase plate during meiosis 2 of meiosis, there are A) chromosomes consisting of one chromatid B) unpaired duplicated chromosomes C) bivalents D) homologous pairs of chromosomes E) both c and d are correct.

a

gametes containn one of each kind of chromosome b/c A) the homologous chromosomes seperate during meiosis B) the chromatids seperate during meiosis C) only one replication of DNA occurs during meiosis D) crossing over occurs during prophase 1 E) the parental cell contains only one of each kind of chromosome

d

crossing over occurs between A) sister chromatids of the same chromosome B) two different kinds of bivalents C) two different kinds of chromosomes D) nonsister chromatids of a bivalent E) two daughter nuclei

d

During which phase of meiosis do homologous chromosomes seperate? A) prophase 2 B) telophase 1 C) metaphase 1 D) anaphase 1 E) anaphase 2

e

Fertilization A) is a source of variation during sexual reproduction B) is fusion of gametes C) occurs in both animal and plant life cycles D) restores the dilpoid number of chromosomes E) all of these are correct

`t

T/F: Normally, a person has 46 chromosomes in his or her karyotype.

t

T/F: Nondisjunction can occur during meiosis 1 or meiosis 2.

f

T/F: During meiosis 1, chromatids seperate, and during meiosis 2 the members of homologous pairs seperate.

f

T/F: The chromosomes are aligned at the metaphase plate of the spindle during anaphase.

t

T/F: Half of your chromosomes were inherited from your father, and half from your mother.

f

T/F: Homologous chromosomes pair during prohase of mitosis.

24,12

If the parent cell has 24 chromosomes, the daughter cells following mitosis will have --- chromosomes and following meiosis will have --- chromosomes.

spermatogenesis, oogenesis

Meiosis in males is a part of -------, and meiosis in females is a part of --------.

fertilization

Oogenesis will not go to completion unless -------- occurs.

gametes, spore

In humans, meiosis produces ----, and in plants, meiosis produces -----.

diploid, haploid

During oogenesis, the primary oocyte is ----- and the secondary oocyte is ------.

d

Spindle fibers are attached to kinetochores. A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

b

The parent cell has ten duplicated chromosomes, and the daughter cells have 5 duplicated chromosomes. A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

d

consists of a numbr of phases. A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

c

The parent cell has 5 duplicated chromosomes, and the daughter cell has 5 chromosomes, consisting of one chromatid each. A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

b,c

In humans, occurs only in the sexual organs. A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

e

The parent cell has 10 duplicated chromosomes, and the daughter cells have 10 duplicated chromosomes.A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

a

Involved in growth and repair of tissues. A) mitosis B) meiosis 1 C) meiosis 2 D) all of these are correct E) none of these are correct

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