Which element is being studied for use in fuel cells to power cars?
a. iron
b. hydrogen
c. oxygen
d. nitrogen
e. uranium
B
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Photosynthesis ceases when leaves wilt, mainly because _____
A) the chlorophyll in wilting leaves is degraded B) flaccid mesophyll cells are incapable of photosynthesis C) stomata close, preventing carbon dioxide from entering the leaf D) photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency E) accumulation of carbon dioxide in the leaf inhibits enzymes
Menstrual flow results in the discharge of
a. the follicle. b. the corpus luteum. c. the lining of the endometrium. d. surface cells from the vagina. e. blood from vessels on the outer side of the uterus.
You have just placed several molecules inside a lysosome. What is going to happen to them?
Which of the following is a microbial product used to reduce crop damage?
A) Bt toxin B) saxitoxin C) ice-minus D) both Bt toxin and ice-minus E) both Bt toxin and saxitoxin