What is the catalytic subunit of prokaryotic RNA polymerase?
A. a
B. b
C. b'
D. ?
D
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A sheep eating by pulling the plant out of the
ground is an example of
a. parasitism. b. predation. c. commensalism. d. mutualism. e. competitive exclusion
__________ refers to multiple independent pairs of genes having similar and additive effects on the
same characteristic. a. Codominance b. Epistasis c. Polygenic inheritance d. Complete dominance e. Additive dominance
Which of the following is not true of Streptococcus pneumoniae?
A. It produces an alpha-hemolysin and hydrogen peroxide. B. It has a polysaccharide capsule that resists phagocytosis. C. It is a small, gram-negative coccus. D. It is the most frequent cause of community-acquired meningitis.
Teratogens affect the ____ more than any other part of the fetal body
a. central nervous system
b. upper limbs
c. heart
d. lower limbs
e. external genitalia