Which of the following are the male gametophytes in flowering plants?
a. stamens
b. sperm
c. shoot parts bearing male flowers
d. pollen grains
e. anthers
D
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In studies designed to determine the origin of HIV, how did the researchers first know that Marilyn the chimp may be infected with HIV?
A. She had been used in HIV research. B. She had tested positive for antibodies against HIV. C. She had HIV DNA in her tissues. D. She had symptoms of HIV infection, or AIDS. E. She had HIV RNA in her blood.
The directionality of nuclear protein import is determined by
a. a Ran/GTP gradient b. importin c. an ion gradient d. the nuclear lamina
Choose the letter of the best match from the following:A. protodermB. vascular cambiumC. apical meristemD. procambiumE. ground meristemProduces parenchyma, collenchyma, and sclerenchyma cells.
Fill in the blank(s) with the appropriate word(s).
A urine dipstick test can diagnose urinary tract infections by indicating
A) elevated levels of leukocyte esterase. B) the presence of glucose in the urine. C) conversion of nitrite to nitrate in the urine. D) direct detection of Gram-positive or Gram-negative bacteria. E) elevated creatine and BUN levels.