What controls circadian rhythms, and which environment sets this clock?
a. an internal clock; an external environment
b. an artificial clock; a natural environment
c. an external clock; an internal environment
d. a natural clock; an artificial environment
Answer: a. an internal clock; an external environment
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The colinearity rule describes rev
A. the correlation between the spatial arrangement of homeotic genes along the chromosome with their expression. B. The correlation between the timing and location of expression of homeotic genes. C. the long stretches of DNA between homeotic gene complexes. D. the parallel arrangement of homeotic genes between different chromosomes. E. the spatial arrangement of alpha helices in proteins encoded by homeotic genes.
what does the T helper 1 cell do? (TH1)
What will be an ideal response?
In an island population, the frequencies of the three MN blood types are given here:
M: 550 MN: 725 N: 225 a. Calculate the allele frequency of M and N. b. Assuming random mating, what are the expected frequencies for each blood type? c. Use chi-square analysis to test your hypothesis that mating is random for this population.
Which term refers to the fusion of the cytoplasm of two genetically different cells?
a. karyogamy b. osmosis c. plasmogamy d. symbiosis