The M cyclin-CDK complex:
A. controls the cell cycle during the M and G2
phases.
B. initiates many events of mitosis.
C. triggers phosphorylation of certain nuclear
proteins, resulting in breakdown of the
nuclear envelope during prophase.
D. phosphorylates proteins that promote
formation of the mitotic spindle.
E. All of these choices are correct.
E
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Once in the female reproductive tract, sperm undergo ____ , a series of physiological changes that allow them to fertilize the egg
Fill in the blank with the appropriate word.
Which of the following catalyzes the process of transcription?
a. RNA polymerase b. DNA polymerase c. ligase d. gyrase e. ribosomes
In what tissues can adult stem cells be found?
A) Stem cells are found only in embryonic tissues. B) Adult stem cells can be found in bone marrow and the liver. C) Stem cells can be found in any tissue that reproduces. D) Adult stem cells are found in hair and fingernail tissues.
What is the major carbohydrate-storage molecule in plants?
a. Starch b. Cellulose c. Glycogen d. Deoxyribonucleic acid