A frog sees a fly and immediately sticks his tongue out to catch it. Which type of cell transmitted the visual signal from
his eye to his brain?
a. afferent neuron
b. efferent neuron
c. interneuron
d. motor neuron
e. Schwann cell
ANSWER: a
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Ecosystems may lose nitrogen through
a. denitrification. b. nitrification. c. nitrogen fixation. d. all of these. e. none of these
___________, such as sea stars, are invertebrate
members of the deuterostome lineage. Fill in the blank(s) with the appropriate word(s).
Coloration in the peppered moth (Biston betularia) is determined by a single gene with two alleles showing complete dominance. Dark moths are homozygous dominant or heterozygous for the gene, light moths are homozygous recessive. In a sample of 100 moths, you determine that 64 of the moths are dark. According to the Hardy-Weinberg rule, the expected frequency of the dominant allele is ________.
A. 0.6 B. 0.64 C. 0.36 D. 0.4 E. It cannot be determined.
The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.
A. Birds B. Amphibians C. Mammals D. Reptiles E. Fish