Which of the following implies movement with regard for direction?
a. taxis only
b. kinesis only
c. migration only
d. taxis and migration only
e. taxis, migration, and kinesis
ANSWER: d
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In codominance, ____
a. one allele is dominant to another allele b. the genotype is determined by the phenotype c. the heterozygous phenotype is intermediate to the homozygous phenotypes d. the intermediate phenotype may be the result of enzyme insufficiency e. two alleles may be equally expressed
The testes are housed in which structure to maintain proper temperature for sperm production?
a. urethra b. vas deferens c. ejaculatory duct d. epididymis e. scrotum
The original atmosphere of Earth is thought to have been rich in
a. CO2, N2, H2, H2S, and CO. b. CO2, N2, O2, Ar, and Ne. c. CO2, N2, O2, Rn, and Ne. d. CO2, N2, H2, Kr, and Xe.
In an experiment with amphibian embryos, cells from a blastomere that was divided in two developed normally under which condition?
A. When they contained at least half of the gray crescent B. Only when cells did not have the gray crescent C. Only when cells received the full amount of gray crescent D. When cells were cleaved bilaterally E. When cells were cleaved radially