The nuclear localization signal is typically a(n) _______, rich in the amino acids _______.
a. -helix; Pro, Lys, and Arg
b. -helix; Leu, Phe, and Gly
c. short chain; Lys and Arg
d. short chain; Phy and Gly
Ans: c. short chain; Lys and Arg
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Multiple sensory receptors can synapse on a single neuron. The receiving neuron has a firing rate proportional to the number of signals received. Which of the following is this an example of?
A. temporal summation B. spatial summation C. action potential D. hyperpolarization
Suppose a group of researchers analyzed a new species of flowering plant. In this species, flower color is determined by two genes. They crossed a truebreeding red-flowered stock with a truebreeding white-flowered stock. They then crossed the F_1 offspring together and analyzed the next generation. Upon examining the flower color, they found that the F_2 generation contained 178 purple, 60 red, and 80 white flowers. What genetic term best describes the inheritance pattern of flower color for this species?
a. genes in one pathway b. no gene interaction c. dominant epistasis d. recessive epistasis
The hormone oxytocin stimulates ____
a. meiosis of oogonia b. ovulation c. implantation of the embryo d. development of the fetal heart e. contraction of uterine muscles during childbirth
Which of the following has been associated with a form of liver cancer?
A. Hepatitis A virus B. Hepatitis B virus C. Human T-cell lymphotropic virus D. Human papilloma virus