The fluid portion of semen is produced by
a. the prostate gland.
b. the seminal vesicle.
c. the bulbourethral gland.
d. the urinary bladder.
e. all of these except the urinary bladder
E
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Altruism involves ____, but reciprocal altruism involves ____
a. the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return for present aid b. aid given to nonrelatives; benefits given to close relatives only c. the expectation of a future favor in return for present aid; close relatives helping each other d. low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others e. aid given to relatives; benefits given to nonrelatives only
Water constantly enters the cells of a freshwater sponge by osmosis. How is the sponge adapted to handle this problem? a. Contractile vacuoles expel fluid to the outside of each individual cell
b. Action of cilia in flame cells drives interstitial fluid into tubes, then out of pores at the surface. c. Extra water and wastes are transported into Malpighian tubules that route them out of the body. d. Water is excreted through tubular excretory organs called nephridia.
If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATA ETH EBI GRA T?
A. Missense B. Deletion C. Insertion D. Nonsense E. Silent
Which of the following could NOT be an RNA
transcript?
a. GGCUAG b. CCGATC c. UUAACC d. ACGGAU e. GAGCAU