Ovulation is triggered by ____
a. high levels of LH
b. low levels of LH
c. low levels of estrogen
d. high levels of estrogen
e. high levels of progesterone
ANSWER: a
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The most common infectious disease of humans is
A. the common cold. B. dental caries. C. hepatitis A. D. halitosis
What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules. B. Odors are distinguished by the way in which they bind both olfactory and taste receptors-it is the overall "picture" generated this way that we perceive. C. Many different types of odors bind to just a few different types of receptor molecules. D. None of the answers are correct.
A young dog has never had much energy. He is brought to a veterinarian for help and she decides to conduct several diagnostic tests
She discovers that the dog's mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best explanation of the dog's condition? A) His mitochondria lack the transport protein that moves pyruvate across the outer mitochondrial membrane. B) His cells cannot move NADH from glycolysis into the mitochondria. C) His cells lack the enzyme in glycolysis that forms pyruvate. D) His cells have a defective electron transport chain, so glucose goes to lactate instead of to acetyl CoA.
Salmonella typhi
What will be an ideal response?