Quiz #8

Multiple Choice:  Identify the choice that best completes the statement or answers the question.

 

____          1.   Mitosis and cytoplasmic division function in

a.

growth.

b.

repair of damaged tissue.

c.

replacement of worn-out cells.

d.

asexual reproduction.

e.

all of these

 

 

____          2.   Which process is absolutely necessary for sexual reproduction to occur in a life cycle but is not necessarily required for organisms that only reproduce asexually?

a.

prokaryotic fission

b.

Mitosis

c.

Meiosis

d.

Cytokinesis

e.

growth factor activation

 

 

____          3.   Proteins that resemble spools on which DNA molecules are wound are called

a.

kinetochores.

b.

centrioles.

c.

motor proteins.

d.

histones.

e.

spindles.

 

 

____          4.   A portion of a DNA molecule wound around a spool of histone protein is called a

a.

centromere.

b.

nucleosome.

c.

spindle.

d.

furrow.

e.

cell cycle.

 

 

____          5.   Each of the two strands in this illustration is called a

 

 

a.

chromosome.

b.

sister chromatid.

c.

nucleosome.

d.

centromere.

e.

none of these

 

 

____          6.   Chromosomes are duplicated during what portion of the cell cycle?

a.

M

b.

D

c.

G1

d.

G2

e.

S

 

 

____          7.   During the "gap" phases (G1 and G2)of the cell cycle, most of the activity is directed toward

a.

DNA replication.

b.

nuclear membrane synthesis.

c.

resting for the next step.

d.

sorting the chromosomes.

e.

synthesizing cytoplasmic organelles.

 

 

____          8.   In mitosis, if a parent cell has 16 chromosomes, each daughter cell will have how many chromosomes?

a.

64

b.

32

c.

16

d.

8

e.

4

 

 

____          9.   Which statement is true of the behavior of chromosomes in mitosis?

a.

Each new cell receives half of the number of chromosomes in the original cell.

b.

Each new cell receives copies of all the original chromosomes.

c.

If the original number of chromosomes was 46, each new cell will have 23.

d.

The sister chromosomes are not identical due to breakages in the DNA.

e.

All chromosomes are duplicated except the sex chromosomes.

 

 

____          10. Cells with two of each kind of chromosome are described by the term

a.

polyploid.

b.

diploid.

c.

triploid.

d.

haploid.

e.

tetraploid.

 

 

____          11. The spindle apparatus is made of

a.

Golgi bodies.

b.

microtubules.

c.

endoplasmic reticulum.

d.

nucleoprotein.

e.

chromatids.

 

 

____          12. The chromosomes are aligned at the spindle equator during

a.

anaphase.

b.

metaphase.

c.

interphase.

d.

prophase.

e.

telophase.

 

 

____          13. The chromosomes move to opposite poles during

a.

anaphase.

b.

metaphase.

c.

interphase.

d.

prophase.

e.

telophase.

 

 

____          14. The chromosomes arrive at opposite poles during

a.

anaphase.

b.

metaphase.

c.

interphase.

d.

prophase.

e.

telophase.

 

 

____          15. The nuclear membrane re-forms during

a.

anaphase.

b.

metaphase.

c.

interphase.

d.

prophase.

e.

telophase.

 

 

____          16. Which of the following statements is false?

a.

Chromosomes do not pair during mitosis.

b.

Genes and chromosomes are duplicated during prophase.

c.

Each species has a specific number of chromosomes.

d.

New nuclei are formed during telophase.

e.

A diploid cell will produce two diploid daughter cells by mitosis.

 

 

____          17. Which of the following is the proper sequence for mitosis?

 

I.

metaphase

II.

telophase

III.

prophase

IV.

anaphase

 

a.

I, III, IV, II

b.

I, II, III, IV

c.

III, I, IV, II

d.

IV, I, III, II

e.

III, IV, I, II

 

 

____          18. Sexual reproduction

a.

leads to uniform characteristics in a population.

b.

results in new combinations of genetic traits.

c.

produces genetic clones.

d.

requires less tissue differentiation than asexual reproduction.

e.

produces genetic clones and requires less tissue differentiation than asexual reproduction.

 

 

____          19. Different, or alternative, forms of the same gene are

a.

genetomorphs.

b.

alleles.

c.

mutants.

d.

chromatids.

e.

homologous.

 

 

____          20. Homologous chromosomes

a.

pair up during meiosis.

b.

have alleles for the same characteristics even though the gene expression may not be the same.

c.

are in pairs, one chromosome of each pair from the father and one from the mother.

d.

separate from each other during meiosis I.

e.

all of these

 

 

____          21. Duplicated chromosomes linked together at their centromeres at the beginning of meiosis are appropriately called what kind of chromatids?

a.

mother

b.

daughter

c.

Sister

d.

homologous

e.

haploid

 

 

____          22. Sister chromatids are separated from each other during

a.

metaphase I.

b.

anaphase I.

c.

telophase II.

d.

anaphase II.

e.

metaphase II.

 

 

____          23. The cell in this illustration is in ____.

 

 

a.

prophase I.

b.

metaphase I.

c.

anaphase I.

d.

prophase II.

e.

anaphase II.

 

 

____          24. Crossing over occurs during

a.

anaphase I.

b.

metaphase II.

c.

prophase I.

d.

prophase II.

e.

telophase II.

 

 

____          25. Paired homologous chromosomes are found at the spindle equator during

a.

metaphase I.

b.

telophase I.

c.

prophase II.

d.

metaphase II.

e.

anaphase II.

 

 

____          26. Crossing over is one of the most important events in meiosis because

a.

it produces new combinations of alleles on chromosomes.

b.

homologous chromosomes must be separated into different daughter cells.

c.

the number of chromosomes allotted to each daughter cell must be halved.

d.

homologous chromatids must be separated into different daughter cells.

e.

all of these

 

 

____          27. Which of the following is true at the end of telophase I in corn (20 chromosomes)?

a.

Each cell has 10 chromosomes.

b.

Each chromosome is duplicated.

c.

Centromeres connect sister chromatids.

d.

Each cell has 10 chromosomes, and each chromosome is duplicated.

e.

Each cell has 10 chromosomes, each chromosome is double-stranded (“duplicated” is better phrasing), and centromeres connect sister chromatids.

 

 

____          28. During meiosis II,

a.

cytokinesis results in the formation of a total of two cells.

b.

sister chromatids of each chromosome are separated from each other.

c.

homologous chromosomes pair.

d.

homologous chromosomes separate.

e.

sister chromatids exchange parts.

 

 

____          29. Meiosis typically results in the production of

a.

two diploid cells.

b.

four diploid cells.

c.

four haploid cells.

d.

two haploid cells.

e.

one triploid cell.

 

 

____          30. Which of the following is NOT true for human cells?

a.

The haploid number is 23.

b.

The diploid number is 46.

c.

The X and Y chromosomes determine the sex of the individual.

d.

Human gametes have two of each type of 23 chromosomes.

e.

Human gametes have one of each type of 23 chromosomes.