Of the following, which event occurs first in
the light-dependent reactions of
photosynthesis?
a. hydrolysis of water.
b. synthesis of sugar.
c. ejection of an electron from chlorophyll.
d. manufacture of ATP.
e. synthesis of NADPH
C
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Bacterial cells with thick peptidoglycan and numerous teichoic acid cross-linkages are Gram stained. The organisms stain pink. Which one of the following statements explains this discre-pancy?
a. The bacterial cells were most likely not heat-fixed to the slide. b. The bacterial cells were subjected to the decolorizer too long and were overdecolo-rized. c. The lot of Gram-stain reagent is most likely expired. d. No discrepancy exists; cells with this composition stain pink on Gram stain.
Why do harmful agents cause the most severe birth defects during the embryonic period?
A) This is a period of rapid differentiation when cells and tissues acquire specific functions and organs form. B) This is the period when substances pass most easily through the placenta. C) The mother's hormones are at the highest levels at this time. D) The embryo has not yet implanted into the uterus.
Granulosa cells surround a:
a. primary oocyte. b. secondary oocyte. c. primary spermatocyte. d. secondary spermatocyte. e. Sertoli cell
HIV uses a 5' cap structure to distinguish copies of the genome destined for translation versus copies used for replication.
Answer the following statement true (T) or false (F)