Which of the following immunoglobulins is produced by plasma cells in response to an allergen?
A. IgA
B. IgD
C. IgE
D. IgG
E. IgM
Answer: C
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Which one of the following is NOT an activity attributed to the checkpoint regulated by the G1/S cyclin-CDK complex in mammals?
A. Protein complexes involved in DNA replication are activated. B. Radiation damage to DNA activates phosphorylation of a p53 protein, preventing its export from the nucleus. C. Excess p53 in the nucleus increases expression of an inhibitor of CDK activity. D. Radiation damage to DNA results in the inhibition of the G1/S cyclin-CDK complex and blocks progression of the cell cycle to S phase. E. Histone expression is inhibited, allowing replication to proceed.
In general, mammals are not good at dispersing chili plant seeds because
a. the seeds die as they pass through the digestive tract. b. the mammals do not travel very far before they release the chili seeds. c. the chili seeds do not stick to the mammals' fur. d. chili seeds are dispersed mainly by the wind. e. the mammals are the main pollinators for the chili plant.
What evidence is there that choanoflagellates were the ancestors to animals? What will be an ideal response?
The genetic material of bacteria can be found in the
A) nucleosome. B) nucleus. C) nucleolus. D) cytoskeleton. E) nucleoid.