The Gram-negative chlamydiae are ________.
A. motile due to periplasmic flagella
B. Gram-positive, spore-forming rods
C. photosynthetic
D. obligate intracellular parasites
Answer: D
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A(n) _____ substance repels water
a. acidic c. hydrophobic b. basic d. polar
The process by which two molecules covalently bond into a larger one is
a. condensation. b. cleavage. c. functional group transfer. d. electron transfer. e. rearrangement.
The accompanying figure shows the history of large meteorite impacts on both the earth and the moon. What is the graph's major implication for the origin of life on Earth?
A) Huge impacts make it unlikely that life arose and survived on Earth before about 3.8 billion years ago. B) Meteorites could not have brought the organic molecules that were necessary for life appear. C) The moon is considerably older than the Earth. D) Life must have originated on a different body in the solar system and been brought to Earth. E) The Oparin-Haldane model of life's origins applies to the moon as well as to the Earth.
Which plants are known for their pneumatophores?
A) cattails B) ash trees C) mangroves D) Spartina