Chapter 9 Assessment (29/30)
1. In the bone marrow, stem cells produce erythrocytes which lose their nucleus and
function for a few months in the bloodstream before they die. Erythrocytes never divide.
Based on this information, erythrocytes
a. Leave the cell cycle in a G3 phase, which immediately follows G2
b. Leave the cell cycle in a G0 phase, after exiting G1
c. Halt in the midst of the S phase
d. Reverse from G2 to G1
e. Continually cycle but simply fail to go through cytokinesis
2. Which of the following are necessary for a cell to pass the G2 checkpoint?
a. Growth signals must be present
b. Sufficient nutrients must be available
c. The DNA must be undamaged
d. All of these
e. None of these
3. Apoptosis refers to cell death and
a. Is merely the accumulation of genetic errors
b. Can be programmed and is essential to normal development
c. Is any failure of the genetic machinery to work properly
d. Is always biologically detrimental to an organism
e. Is a failure in the translation of transcription mechanism
4. Which represents the correct sequence of stages in the cell sycle?
a. G1, G2, M, S
b. G1, G2, S, M
1. In the bone marrow, stem cells produce erythrocytes which lose their nucleus and
function for a few months in the bloodstream before they die. Erythrocytes never divide.
Based on this information, erythrocytes
a. Leave the cell cycle in a G3 phase, which immediately follows G2
b. Leave the cell cycle in a G0 phase, after exiting G1
c. Halt in the midst of the S phase
d. Reverse from G2 to G1
e. Continually cycle but simply fail to go through cytokinesis
2. Which of the following are necessary for a cell to pass the G2 checkpoint?
a. Growth signals must be present
b. Sufficient nutrients must be available
c. The DNA must be undamaged
d. All of these
e. None of these
3. Apoptosis refers to cell death and
a. Is merely the accumulation of genetic errors
b. Can be programmed and is essential to normal development
c. Is any failure of the genetic machinery to work properly
d. Is always biologically detrimental to an organism
e. Is a failure in the translation of transcription mechanism
4. Which represents the correct sequence of stages in the cell sycle?
a. G1, G2, M, S
b. G1, G2, S, M
