The two copies of each type of chromosome found in normal somatic (body) cells in an organism, throughout the cell cycle, are called:
A. Sister chromatids
B. Homologous chromosomes
C. Daughter chromosomes
D. Kinetochores
B. Homologous chromosomes
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Which ion is not transported out of the cells when a person has cystic fibrosis?
a. Nitrogen b. Hydrogen c. Sodium d. Potassium e. Chloride
How does the lactose repressor block transcription of the lactose operon?
a. By "turning off" the lacA intron b. By degrading the lacZ protein product c. By binding allosterically to the lacZ gene d. By slowing the uptake of lactose into the cell e. By binding to the operator
Which of the following statements about plant cytokinesis is true?
a. It begins when telophase ends. b. A division furrow completely separates the cytoplasm. c. It is under the control of Ca2+. d. Vesicles fuse to form a cell plate. e. The spindle fibers break down to form a cell plate.
The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of the protocol makes the heat-stability most necessary?
A. Synthesis B. Denaturation C. Primer annealing D. Antibody binding