Which organelle contains powerful enzymes for digesting cellular waste?
a. Golgi body
b. ribosome
c. mitochondrion
d. lysosome
e. peroxisome
ANSWER: d
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Why is it an advantage for animals that migrate long distances to store energy as lipids rather than carbohydrates?
What will be an ideal response?
Codon bias suggests that
A) some codons evolved earlier than others. B) not all nonsynonymous substitutions are neutral. C) some codons are selectively favored over others. D) small fitness effects can make a large difference over time. E) some tRNAs are more abundant than others.
Answer the following statements true (T) or false (F)
1. Meiosis does not occur in gametophytes. 2. Although land plants, mosses are still tied to water because of their flagellated sperm. 3. The conspicuous green patches of mosses that you see in the woods are mostly sporophytes. 4. The conspicuous green parts of ferns that you see in the woods are mostly sporophytes. 5. Woody plants and herbaceous plants are the two major monophyletic clades of the seed plants.
Which of the following is most likely to be responsible if, when your blood sugar level rose, the level went back down?
A) the use of the sugar for energy by your cells B) a homeostatic mechanism based on negative feedback C) type 2 diabetes D) a homeostatic mechanism based on positive feedback