Which of the following nitrogenous bases is not found in DNA?
A. guanine
B. thymine
C. uracil
D. cytosine
E. adenine
Answer: C
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The photosynthetic electron transport causes the accumulation of protons in which part of the chloroplast?
A. matrix B. stroma C. outer membrane D. internal thylakoid space
The organisms that live in a kelp forest and the sediment or rocks the kelp uses to attach to is an example of what?
a. None of these choices b. An ecosystem c. Biosphere d. Ecology
In what way are animals that are normally active during the daytime different than animals that are normally active at night?
a. Animals that are normally active during the daytime display worse visual acuity under high-light conditions compared to animals that are normally active during the night. b. Animals that are normally active during the daytime display improved visual acuity under high-light conditions compared to animals that are active during the night. c. Animals that are normally active at night display worse visual acuity under low-light conditions compared to animals that are normally active during the daytime. d. Animals that are normally active at night display improved visual acuity under low-light conditions compared to animals that are normally active during the daytime.
Biologists usually classify things according to their:
a. appearance b. habitat c. when they lived