What triggers the entry of a cell into mitosis?
a) the addition of inhibitory phosphate groups to Cdk1 by the Wee1 kinase
b) the removal of inhibitory phosphase groups from Cdk1 by the Wee1 kinase
c) the addition of inhibitory phosphate groups to Cdk1 by the Cdc25 phosphatase
d) the removal of inhibitory phosphate groups from Cdk1 by the Cdc25 phosphatase
Ans: d) the removal of inhibitory phosphate groups from Cdk1 by the Cdc25 phosphatase
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Sequences of DNA that are identical when read from the 5' to 3' direction on one strand and the 3' to 5' direction on the other strand are ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
Constipation can be caused by
a. emotional stress. b. a low-fiber diet. c. a sedentary lifestyle. d. dehydration. e. all of these.
Which of the following symptoms can help you recognize a person who is undergoing anaphylactic shock?
A. Immediate allergic response after a person is exposed to the allergen that can produce the following symptoms: drop in blood pressure, increased dilation of the capillaries, constriction of the bronchi and the inability to breathe. B. Immediate allergic response after a person is exposed to the allergen that can produce the following symptoms: drop in blood pressure, decreased dilation of the capillaries, constriction of the bronchi and the inability to breathe. C. Immediate allergic response after a person is exposed to the allergen that can produce the following symptoms: an increase in blood pressure, increased dilation of the capillaries, constriction of the bronchi and the inability to breathe. D. A gradual allergic response after a person is exposed to the allergen that can produce the following symptoms: drop in blood pressure, increased dilation of the capillaries, constriction of the bronchi and the inability to breathe. E. None of these are the symptoms of a person undergoing anaphylactic shock.
How many distinct aminoacyl-tRNA synthetases does each cell make?
A. ~180 B. ~60 C. ~20 D. ~1 E. ~120