The immediate threat posed by the pesticide DDT to predatory birds is:
A) mortality of adult birds.
B) male sterility.
C) overly thin eggshells and deaths of embryos.
D) inability of adults to fly.
Ans: C) overly thin eggshells and deaths of embryos.
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Which of the following is TRUE of ligand-gated ion channels?
A. They bind ions with high affinity. B. They tend to allow any ion to pass through the channel. C. The intracellular domain of the channel contains the binding site for the ligand. D. They open upon binding the ligand to allow specific ions to pass through them. E. Ligand binding closes the channels preventing further ion passage through the channel.
Which of the following linkage maps correctly shows the order and distance between the y, f, and v genes?
In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. The F2 are distributed as follows:
A) f——35 m.u.——y——15 m.u.——v
B) f——22 m.u.——y——15 m.u.——v
C) y——35 m.u.——f——22 m.u.——v
D) y——22 m.u.——v——15 m.u.——f
E) y——15 m.u.——v——22 m.u.——f
During the cell cycle, DNA replicates during the late G1 phase
Indicate whether the statement is true or false
All of the following increase blood vessel permeability EXCEPT
A) kinins. B) prostaglandins. C) lysozymes. D) histamine. E) leukotrienes.