The directionality of nuclear transport is determined by _______ in the nucleus and _______ in the cytosol.
a. high Ran; low Ran
b. low Ran; high Ran
c. high Ran/GTP; high Ran/GDP
d. high Ran/GDP; high Ran/GTP
Ans: c. high Ran/GTP; high Ran/GDP
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A tick population in a rural, wooded area uses deer as its primary host species. Eventually, humans begin to move into the area, bringing their pets along with them. Certain individuals within the tick population start to use dogs as their primary hosts, and eventually start to prefer dogs over deer. Other individuals continue to use deer for their primary host. Could this difference in host preference lead to speciation? Why or why not? Select all correct answers.
_____ Yes, because temporal isolation could occur due to differences in host quality. _____ No, because the ticks inhabit the same region and therefore experience the same mechanisms of evolution. _____ Yes, because the ticks' host preference may be inherited, leading to an accumulation of genetic differences between ticks that use deer and ticks that use dogs. _____ No, because one of the hosts will lead to higher fitness and the ticks that prefer the other host will be eradicated.
A dihybrid cross of linked genes theoretically gives a phenotypic ratio of
A. 1:1. B. 9:3:3:1. C. 3:1. D. 1:1:1:1. E. 2:1.
Which pancreatic secretion works in conjunction with bile?
a. protein digesting enzymes b. secretin c. carbohydrate digesting enzymes d. fat digesting enzymes e. bicarbonate
Factors of weather and climate that operate on a population regardless of its size are called ________ effects.
Fill in the blank(s) with the appropriate word(s).