The flu differs from a cold in that the flu ________.
A. responds to streptomyocin
B. is more virulent
C. infects only the upper respiratory tract
D. two of the above
Answer: B. is more virulent
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Single-celled parasites known as ____ infect insects, fish, and humans (especially those with compromised immune
systems).
a. amoebae b. red algae c. microsporidia d. dinoflagellates e. apicomplexans
In your fertility clinic, you look at the lab results of a young man. He has a prostate gland the size of a golf ball, a fructose-rich semen, and 10 million sperm per ml. His sperm consist of little more than DNA, mitochondria, and a flagellum, with almost no cytoplasm. Also, he has follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in his bloodstream. Which of these is the likely cause of his fertility problems?
A. enlarged prostate gland B. fructose in the semen C. sperm count D. sperm morphology E. FSH and LH
A bear at a national park has discovered that if it can open the lid of the trash cans, it is likely to find tasty food inside. Soon it is trying to open the trash cans all over the park. What mechanism of learning has occurred?
A. classical (Pavlovian) conditioning B. habituation C. operant conditioning D. air conditioning Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about different learning mechanisms? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which mRNA modification is likely absent if the mRNA is degrading prematurely from the 5? end of the mRNA?
A) removal of introns B) RNA editing C) addition of the 7-methylguanosine cap to the 5? end D) addition of the 3? polyadenylated tail E) splicing together of exons