What are bacteroids?
a. specialized nitrifying bacteria
b. small buds from ammonifying bacteria
c. specialized bacteria that help some plant roots absorb phosphorus
d. enlarged and immobilized nitrogen-fixing bacteria
Answer: d. enlarged and immobilized nitrogen-fixing bacteria
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The organization of the vasa recta around the loop of Henle:
A. allows urea to be concentrated in the distal convoluted tubule. B. allows water to be maximally reabsorbed from the distal convoluted tubule. C. allows the concentration gradient established by the loop of Henle to be maintained. D. allows urea to be concentrated in the distal convoluted tubule and allows the concentration gradient established by the loop of Henle to be maintained. E. allows water to be maximally reabsorbed from the distal convoluted tubule and allows the concentration gradient established by the loop of Henle to be maintained.
Destruction of the motor areas in the right cerebral cortex results in the loss of
a. sensation on the right side of the body. b. sensation on the left side of the body. c. voluntary movement on the left side of the body. d. voluntary movement on the right side of the body. e. involuntary control of the right side of the body.
The planet Mercury is closer to the sun than the planet Venus. However, temperatures on Venus are hotter than temperatures on Mercury. Why would this be the case?
A) Mercury has a thicker atmosphere than Venus that blocks heat from the sun. B) Mercury spins more quickly than Venus, so its surface cannot heat up as quickly. C) Venus has a thicker atmosphere than Mercury that traps heat from the sun. D) Venus is cooled by high concentrations of water vapor in its atmosphere.
Which of the following is most like the formation of identical twins?
A) cell cloning B) therapeutic cloning C) use of adult stem cells D) organismal cloning