Much of the loss of biologically available nitrogen in the ocean is now thought to be due to a consortium of microbes carrying out ________.
A. denitrification
B. the anammox reaction
C. nitrogen fixation
D. nitrification
Answer: B
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When differentiation occurs, cells may also change in
_____ genetic content. _____ size. _____ shape.
Proper functioning of the human kidney requires considerable active transport of sodium in the kidney tubules. If these active transport mechanisms were to stop completely, how would urine production be affected?
A. No urine would be produced. B. A lower-than-normal volume of urine which was less concentrated than the blood (hypotonic) would be produced. C. A lower-than-normal volume of urine which was more concentrated than the blood (hypertonic) would be produced. D. A greater-than-normal volume of urine equal in concentration to the blood (isotonic) would be produced. E. A greater-than-normal volume of urine that was more concentrated than the blood (hypertonic) would be produced.
What component is not found in the cytoplasm of an egg?
a. Yolk proteins b. mRNA transcripts c. Yolk fatty acids d. tRNAs e. Ribosomes
Human chorionic gonadotropin (hCG)
a. is produced by the amnion. b. can be used to reveal pregnancy. c. is stored in the ovaries. d. acts as a hormone signaling menstruation. e. is needed to form the placenta.