Which process results in a zygote?
a. meiosis.
b. mitosis.
c. fertilization.
d. none of the above.
a
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The oldest proglottid of a tapeworm is
(a) the scolex. (b) the one nearest its neck. (c) the one in its middle. (d) the one at its end.
Which of the following is not a component of the mating-type switch mechanism?
A. HO nuclease B. Rad51 C. synthesis-dependent strand annealing (SDSA) D. RecA E. HML?
Which of the following is heterosporous?
a. whisk fern b. spike moss c. horsetail d. liverwort e. hornwort
It has been observed that when plants are subjected to extreme physical stress such as drought or high salinity, the transcription and activity of transposase genes increases. Increased transposase activity may
A) increase the rate of mutation under stressful conditions. B) aid in repairing DNA damage caused by stressful conditions. C) halt DNA replication and cell division. D) increase homologous recombination and genetic diversity. E) explain why some plants can't withstand drought conditions.