Researchers in Alaska were interested in increasing the sockeye salmon (Oncorhynchus nerka) population in three coastal lakes. To accomplish this, the ponds were treated with fertilizers. As a result, zooplankton biomass increased between 40% and 700% in the three lakes. The substantial growth in zooplankton would suggest that prior to these experiments, these lakes were ________.
A. subject to low light levels
B. stratified
C. oligotrophic
D. eutrophic
Answer: C
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Which of the following serves as a switching mechanism in the photoperiodic response in plants?
a. phytochrome b. auxin c. cryptochrome d. calmodulin e. phytoalexin
The photoreceptors of an earthworm are
located
a. on short antennae. b. on their body surface. c. in their eyes. d. near the tip of their tail. e. nowhere- earthworms do not have photoreceptors.
In Drosophila, the allele red eyes (bw+) is dominant to the allele for brown eyes (bw). At another gene locus on the same chromosome, the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv). Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F1 progeny.What would be the results of a test cross with the F1 flies?
A. 1 brown eye, thin wing veins: 1 red eye, heavy wing veins B. 1 brown eye, heavy wing veins: 2 red eye, thin wing veins: 1 red eye, thin wing veins C. 1 brown eye, thin wing veins: 2 red eye, thin wing veins: 1 red eye, heavy wing veins D. 1 brown eye, heavy wing veins: 1 red eye, thin wing veins
The start codon for translation is
A. AGU. B. AUG. C. AAA. D. UAA. E. UAG.