It is thought that the first multicellular organisms arose about _____ years ago.
A. 6 billion
B. 1.2 billion
C. 3 billion
D. 500 million
E. 3.5 billion
B. 1.2 billion
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At which phase are centrioles beginning to move apart in animal cells?
A) telophase B) anaphase C) prometaphase D) metaphase E) prophase
You breed a black, long-haired rabbit with a white, short-haired rabbit. All of the offspring have long, black hair. If the genes for hair color and length are closely linked on the same chromosome, what would you expect to see in the F2 generation?
A. 15 black, long-haired: 1 black, short-haired: 1 white, long-haired: 5 white, short-haired B. 3 black, long-haired: 1 white, short-haired C. 9 black, long-haired: 3 black, short-haired: 3 white, long-haired: 1 white, short-haired D. 3 black, long-haired: 9 black, short-haired: 9 white, long-haired: 1 white, short-haired E. All long-haired black
An individual is moderately dehydrated and reaches for a beer to quench his thirst. Although this person thinks that he is hydrating himself, he is actually causing additional dehydration. Why is this the case?
A) The alcohol in the beer inhibits antidiuretic hormone. B) The alcohol in the beer causes a decrease in sodium reabsorption in the nephron. C) The alcohol in the beer inhibits aldosterone. D) The alcohol in the beer causes an increase in the activity of renin.
The "start" sequence for translating mRNA code represents the amino acid _____.The "start" sequence for translating mRNA code represents the amino acid _____.
A) methionine B) arginine C) valine D) leucine