Photosynthesis and the Cell Cycle

Which of the following is NOT a checkpoint that controls the progression of the cell cycle?

• The G1/S checkpoint determines if conditions are favorable for cell division.

• The S/G2 checkpoint checks for DNA damage and determines if all the DNA is replicated.

• The metaphase/anaphase checkpoint determines if all chromosomes are attached to the spindle apparatus.

• The telophase/cytokinesis checkpoint checks the formation of a cleavage furrow to separate the cells.

Which of the following statements is FALSE concerning sister chromatids?

• The formation of sister chromatids doubles the amount of DNA in a cell.

• Sister chromatids separate during telophase.

• Sister chromatids are held together at the centromere by cohesion proteins.

• Sister chromatids are formed during the S phase of the cell cycle.

What does NOT happen in the cytokinesis of plant cells?

• Formation of cleavage furrow to separate the cells.

• Cell wall forms between the two daughter cells.

• The two nuclei are segregated into separate daughter cells.

• When the vesicles fuse, their membranes contribute to the formation of plasma membrane on either side of the cell plate.

Sister chromatids separate during

• prophase of meiosis I

• metaphase of meiosis I

• anaphase of meiosis II

• anaphase of meiosis I

What is the first stable intermediate of the Calvin Cycle and what enzyme made this intermediate?

• 3GP, Rubisco

• 3GP, PEP Carboxylase

• 3PG, Rubisco

• 3PG, PEP Carboxylase

Given that the C4 pathway gets around the problems of photorespiration, why don't all plants use it?

• It is a more recent process, and many plants have not had time to evolve this pathway.

• It also has an energetic cost.

• It requires extra enzymes that many plants lack.

• It requires special transport tissues that many plants lack.

The Calvin Cycle requires all of the following except

• CO2

• ATP

• NADPH

• O2

In eukaryotic cells the DNA is replicated during the S phase

• False

• True

The correct order of the eukaryotic cell cycle is

• G1, G2, S, M

• M, S, G2, G1

• G1, S, G2, M

• S, G1, G2, M

How many chromosomes are in a normal human cell?

• 46

• 23

• 48

• 24