In which of these groups does it appear that the cuticle evolved?
A. Streptophytes
B. Bryophytes
C. Algae
D. Land plants
E. Pterophytes
D. Land plants
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Which letter indicates the direction of incoming light in a typical vertebrate?
Vision differs from the other senses in two interesting ways. Although most sensory receptor neurons are depolarized when the receive a stimulus, rod and cone cells become hyperpolarized when they receive light. When hyperpolarized, they stop releasing inhibitory neurotransmitter and allow the bipolar cells to fire. A second unusual aspect is that the vision circuit seems to be organized "backwards" -- the light must pass through the layers of ganglion and bipolar cells to reach the rods and cones.
A. A
B. B
C. C
D. D
E. All of the directions are possible.
The probability of producing a normal child by
two parents who are carriers for an autosomal recessive disorder is
a. 50 percent. b. 0 percent. c. 100 percent. d. 25 percent. e. 75 percent
Transformation of bacteria was shown to occur when ________ bacteria were injected into mice and the mice ________.
A. live S strain; died B. live S and R strain; died C. live R strain and dead S strain; died D. live S strain and dead R strain; didn't die E. live R strain; didn't die
A compound is extracted from a microbial culture and is modified in the laboratory for use as an oral medication. This product would be a(n)
A) antibiotic. B) analog. C) semisynthetic antimicrobial. D) synthetic antimicrobial. E) probiotic.