A plant embryo (young sporophyte) packaged with a food supply in a tough outer coat is a:
a. Gemmae
b. Pollen grain
c. Seed
d. Sperm
e. Fruit
Answer: c. Seed
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Halobacterium salinarum lives in and requires a high salt concentration. This is an example of an archaeon described as a ______.
A. halophile B. thermophile C. barophile D. psychrophile
How are the membranes of many eukaryotic organisms able to remain fluid when the temperature
becomes extremely cold?
a. The percentage of unsaturated fatty acids in the membrane is increased. b. The percentage of saturated fatty acids in the membrane is increased. c. The percentage of cholesterol molecules in the membrane is increased. d. The percentage of both unsaturated fatty acids and cholesterol is increased. e. The percentage of both saturated fatty acids and cholesterol is increased.
What happens when living R strain Streptococcus pneumoniae bacteria are mixed with heat-killed S
strain Streptococcus pneumoniae bacteria?
a. The S strain bacteria come back to life. b. The R strain bacteria are killed, and the S strain bacteria remain dead. c. The R strain bacteria are transformed into S strain bacteria. d. The S strain bacteria are transformed into R strain bacteria. e. The R strain bacteria are killed, and the S strain bacteria come back to life.
A peptidoglycan-like polymer found in the cell walls of some Archaea is called ________.
Fill in the blank(s) with the appropriate word(s).