Which organelle has enzymes that break down fatty acids, amino acids, and toxins?
a. lysosomes
b. peroxisomes
c. Golgi bodies
d. vacuoles
e. rough ER
ANSWER: b
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DNA is the main hereditary material of all life. However, DNA lacks one important characteristic for the first forms of life. Why have researchers rejected the idea that DNA was found in the first life form?
A) It does not function as a catalyst. B) It is not stable enough to have withstood early Earth's harsh atmosphere. C) DNA only has four types of bases. Therefore, DNA cannot adapt and evolve. D) The type of sugar found in DNA is too complicated to have been present early in Earth's history.
____ of a trait in a population can be measured and is the proportion of the total variation in the trait (phenotypic variation) that is due to genetic differences among individuals
Fill in the blank with the appropriate word.
The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.
Yeast are
a. single-celled fungi. b. multicellular plants. c. single-celled plants. d. single-celled protists. e. multicellular fungi.