Which of the following is incorrectly paired?
A) sexual selection: mating based on phenotype
B) bottleneck effect: changes in allele frequencies due to chance events
C) gene flow: genes move from one population to another
D) founder effect: only a small portion of an original population's gene pool are represented
Answer: B
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Primate evolution and behavior, such as hunting skills, have been directed in part by the development of depth perception. What anatomical change made depth perception possible?
A) a larger brain B) the formation of compound eyes C) movement of the eyes to the front of the head D) diurnal activity
Many retroviruses have sequences complementary to the 3' end of the tRNA molecules present in the host cell infected by the virus. What is the purpose of the complementarity?
A. The tRNA acts as a primer for DNA synthesis by reverse transcriptase. B. The tRNA activates the reverse transcriptase. C. The tRNA prevents binding of integrase until after the double-stranded DNA is delivered to the nucleus. D. The tRNA is needed for proper compacting of the RNA genome. E. None of the choices given is correct.
Gram-positive bacteria have a thinner layer of peptidoglycan than gram-negative bacteria.
Answer the following statement true (T) or false (F)
Which division of the nervous system is divided into two opposing systems that control smooth muscles and glands?
a. autonomic b. somatic c. afferent d. central nervous system e. voluntary nervous system