Which statement about cryptochrome is false?
a. It is implicated in resetting the biological clock.
b. It is a "clock protein."
c. It absorbs green light.
d. Its counterparts are found in fruit flies and mice.
e. It sometimes interacts with phytochrome.
c
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During human gestation, rudiments of all organs develop _____
A) in the first trimester B) in the second trimester C) in the third trimester D) while the embryo is in the oviduct E) during the blastocyst stage
The formula p2 + 2pq + q2 = 1 is associated with which of the following?
A. Calculations of heterozygosity B. Hardy-Weinberg equilibrium C. Calculations of recombination frequencies D. Degrees of freedom
A long piece of ribbon wired along both long edges is twisted into a helix and wrapped around individual pipe cleaners that have been rolled into spools; this grouping is then twisted (super coiled) again to condense it. This could be best used as a simple model for
a. a plasma membrane, where the pipe cleaners represent the phospholipid bilayer and the ribbon represents proteins embedded in the membrane. b. a cell wall. c. a mitochondrion. d. a chromosome, where the pipe cleaners represent bundles of proteins around which the DNA double helix (wired ribbon) is wrapped.
Crossing a heterozygous parent with a homozygous recessive parent should produce a ratio of dominant-to-recessive phenotypes of approximately _____.
A) 1:1 B) 2:1 C) 3:1 D) 9:3:3:1