Question

Question 25

Put the steps of the process of signal transduction in the order they occur.

1. A conformational change in the signal-receptor complex activates an enzyme.

2. Protein kinases are activated.

3. A signal molecule binds to a receptor.

4. Target proteins are phosphorylated.

5. Second messenger molecules are released.

		1, 2, 3, 4, 5
		3, 1, 2, 4, 5
		3, 1, 5, 2, 4
		1, 2, 5, 3, 4

Question 26

Cancer cells require many nutrients which are supplied by blood vessels. The growth of new blood vessels into cancerous tissue is called

		angiogenesis.
		metastasis.
		carcinogenesis.
		apoptosis.

Question 27

Apoptosis

		is programmed cell death.
		is a process that acts to decrease the number of somatic cells.
		frees the fingers and toes of the human embryo from their "webbed" structure to independent structures.
		All of the choices are correct.

Question 28

Interphase

		occupies the majority of the cell cycle
		includes G1, S, and G2 stages
		results in an increase in cell size
		All of the answer choices are correct.

Question 29

What might prevent a cell from passing the G1 checkpoint?

		The DNA has not completed replication.
		The cell may need to enter the G0 stage.
		The cell may have damaged DNA and need to undergo apoptosis.
		Only B and C are correct.

Question 30

Which stage of the cell cycle focuses on cell growth, replication of organelles, and the accumulation of material for synthesizing DNA?

		M phase
		G1 phase
		G2 phase
		S phase

Question 31

Which sequence of the mitotic stages is correct?

		prophase, anaphase, prometaphase, metaphase, telophase
		prophase, telophase, anaphase, prometaphase, metaphase
		prophase, prometaphase, metaphase, anaphase, telophase
		telophase, anaphase, prophase, prometaphase, metaphase

Answer 1

Question 25

Solution - Option C - 3, 1, 5, 2, 4

Process of signal transduction occur in the following order

Question 26

Solution- Option A. Angiogenesis

The growth of new blood vessels into cancerous tissue is called Angiogenesis

Metastasis- is the process of spread of cancerous cells from the primary site of cancer. Therefore option B is wrong

Carcinogenesis is the process of cancer formation. Therefore option C is wrong

Apoptosis.is the death of cells after injury it is also called cellular suicide- Therefore option D is wrong

Question 27

Solution- Option D.  All of the choices are correct.

• Apoptosis is programmed cell death.
• Apoptosis is a process that acts to decrease the number of somatic cells.
• Apoptosis frees the fingers and toes of the human embryo from their "webbed" structure to independent structures.

Question 28

Solution- Option D. All the choices are correct

• Interphase occupies 90%-96% of the duration of the cell cycle
• Interphase includes G1, S, and G2 stages
• During interphase, cell double or increase its size

Question 29

Solution- Option D Optionc B and C are correct

• The cell may need to enter the G₀ stage. Entry to G₀ stage prevent a cell from passing the G1 checkpoint
• Damaged DNA also  prevent a cell from passing the G1 checkpoint

The DNA replication occurs during S-phase. Therefore option A is incorrect