If the p53 gene is damaged, a cell can behave as though there are which of the following?
a. more mutations
b. apoptotic mutations
c. no mutations
d. proto-oncogene mutations.
c. no mutations
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The binding of a neurotransmitter to ligand-gated K+ channels will cause ____ in the postsynaptic membrane
a. depolarization only b. hyperpolarization c. repolarization only d. apolarization e. depolarization and repolarization
Two contraceptive methods that are generally irreversible and which block the gametes from moving to a site where fertilization can occur are _____
A) the male condom and female condom B) the male condom and oral contraceptives C) vasectomy and tubal ligation D) the diaphragm and subcutaneous progesterone implant
Which of the following statements regarding vectors is FALSE?
A. Vectors are usually autonomously replicating DNA molecules. B. A useful vector contains multiple restriction sites for insertion of DNA. C. Vectors are generally over 100,000 base pairs in size. D. Cloning vectors frequently contain sequences necessary for expression of inserted sequences. E. Cloning vectors include a "marker" to facilitate identification of cells containing them.
Which condition favors sexual reproduction over asexual reproduction?
a. a stable environment b. uniform environments c. sparsely settled populations d. sessile animals e. an unstable environment