Question

QUESTION 1

A gene that encodes a protein that stimulates progression of the cell cycle is known as a proto-oncogene.

True

False

QUESTION 2

Cytokinesis occurs after which stage or phase of the cell cycle?

	a.	G2
	b.	S
	c.	G0
	d.	G1
	e.	M phase

QUESTION 3

During cell-cycle checkpoints, protein kinases known as CDKs phosphorylate target proteins only when they associate with a cyclin.

True

False

QUESTION 4

During mitosis, many of the spindle fibers attach to chromosomes at their

	a.	kinetochores
	b.	telomeres
	c.	small arms
	d.	long arms

QUESTION 5

During which stage or phase of the cell cycle does the cell replicate its chromosomes?

	a.	G1
	b.	M phase
	c.	G2
	d.	G0
	e.	S

QUESTION 6

Each duplicated chromosome prior to division is held together at a region called the

	a.	tetrad
	b.	centromere
	c.	cross-over
	d.	microtubule
	e.	chromatid

QUESTION 7

Haploid cells do not undergo mitosis.

True

False

QUESTION 8

Mitosis is a process of cell division that results in

	a.	two unique daughter cells.
	b.	two identical daughter cells.
	c.	three identical daughter cells.
	d.	four unique daughter cells.

QUESTION 9

Select which statement(s) is(are) correct:

	a.	DNA is slightly more compact during mitosis than during interphase
	b.	DNA is dramatically more compact during mitosis than during interphase
	c.	DNA is slightly more compact during interphase than during mitosis
	d.	DNA is dramatically more compact during interphase than during mitosis
	e.	None of the above. The degree of DNA compaction depends on the cell type

QUESTION 10

The S phase of the cell cycle results in the production of two identical copies of each chromosome, known as

	a.	sister chromatids
	b.	tetrad
	c.	daughter chromosomes
	d.	homologous chromosomes

QUESTION 11

The levels of cyclin proteins___________

	a.	increase exponentially as the cell progresses through the cell cycle. After the cell divides, all cyclins are degraded.
	b.	are the highest in the beginning of the cell cycle, and then they gradually decrease as the cell progresses through the cell cycle.
	c.	vary coincident with the different stages of the cell cycle: different cyclins are stage-specifically regulated.
	d.	increase only when the cell enters cell-cycle arrest.

QUESTION 12

The mitotic spindles are bipolar arrays of

	a.	actin filaments
	b.	intermediate filaments
	c.	microtubules composed of tubulin
	d.	two of the above

QUESTION 13

What type(s) of protein complex interact(s) with DNA during mitosis?

	a.	condensin
	b.	cohesin
	c.	mitosin
	d.	transcription factors
	e.	A and B
	f.	A, B and C
	g.	All of the above

QUESTION 14

What would happen if a mutation in both copies of the RB1 gene results in an abnormal retinoblastoma protein that can no longer bind E2F?

	a.	The cell would enter G0 and differentiate.
	b.	The cell would bypass the G1 checkpoint and enter S phase.
	c.	Cyclin D1-Cdk4 would no longer phosphorylate pRB.
	d.	E2F would phosphorylate cyclin D1.

QUESTION 15

Which organelle migrates during M phase to form the two opposite poles of the dividing cell and acts as the source of the spindle fiber microtubules?

	a.	kinetochore
	b.	chromosome
	c.	centromere
	d.	chiasmata
	e.	centrosome

QUESTION 16

Which pathway is affected by an inherited mutation in the ATM gene?

	a.	nucleotide excision repair pathway
	b.	RecA
	c.	p53
	d.	reactivation repair pathway

QUESTION 17

Which statement is not true?

	a.	When the cell enters G0, it stops dividing and terminally differentiate.
	b.	Each chromatid has one kinetochore.
	c.	Chromosomes start duplicating during prometaphase, and then they separate during anaphase.
	d.	Somatic cells divide by mitosis and the diploid number of chromosomes is maintained throughout the cell cycle.

Need answers asap.i would really appreciate your help.

Answer 1

1) The genes which encodes for proteins which stimulate progression of cell cycle is known as proto-oncogene. Therefore, the given statement is true.

Similarly, the genes which code for proteins that have inhibitory effect and arrests cell division are known as tumor suppressor genes.