Amphibians were diverse and abundant in the lush swamp forests of the ________, which is sometimes referred to as the age of the amphibians
A) Cambrian period
B) Pleistocene epoch
C) Mesozoic era
D) Carboniferous period
Answer: D
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In a small population of cockroaches living in your kitchen, only a few roaches mate in one year. This can lead to random changes in allele frequency in the population through ______
A. nonrandom mating. B. selection. C. genetic drift. D. mutation. E. migration.
Which of the following statements is not true concerning peptidyl transferase?
A) It is a ribozyme having catalytic activity. B) It catalyzes peptide bond formation. C) It moves the ribosome, so translation continues. D) It is associated with the large subunit of ribosomes. E) It requires no outside source of additional energy, such as ATP.
Chromatids are
a. attached at the centriole. b. a pair of chromosomes, one from the mother and one from the father. c. attached at their centromeres. d. identical until crossing over occurs. e. attached at their centromeres and are identical until crossing over occurs.
Over a lifetime about how many primary oocytes move through the ovarian cycle?
a. 300 b. 1000 c. 20,000 d. 200,000 e. 2,000,000