Which mammal group is characterized by offspring that are born early in development and then finish embryonic development while nursing in their mother's abdominal pouch?
a. Monotremes
b. Eutherians
c. Placental mammals
d. Marsupials
e. Sloths
Answer: d. Marsupials
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The ammocoete is the larva of
(a) lampreys. (b) sharks. (c) bony fishes. (d) amphibians.
Nematodes
A. are roundworms. B. are found in the gastrointestinal tract or the blood. C. are carried by bacteria. D. have flat segmented bodies. E. are roundworms AND are found in the gastrointestinal tract or the blood.
The electrons that are present in NADH and FADH2 are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved in a way to use the various steps of cellular respiration to produce ATP?
a. It would be less efficient to produce ATP directly from NADH and FADH2. b. There are insufficient amounts of ADP to phosphorylate and make ATP. c. All living organisms must use oxygen and therefore must carry out cellular respiration. d. The steps in respiration allow for a controlled release of energy in small increments. e. Not all cells have NADH and FADH2 present in their cytoplasm.
Why can measles virus and poxvirus infect many human tissues and influenza virus can infect only
one type of tissue? What will be an ideal response?