The nitrogenous base found in DNA but not in RNA is
a. adenine.
b. cytosine.
c. guanine.
d. uracil.
e. thymine.
E
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The experiment in Figure 8.2 demonstrates that the ratio of 18O2 /16O2 increases when:
A. the water in the experiment contains 18O2. B. the carbon dioxide in the experiment contains 18O2. C. the water and carbon dioxide in the experiment both contain 18O2.
At least some of the cells of a mammalian heart in the final phase of development would most likely be
A. undergoing apoptosis B. dividing rapidly C. expressing segmentation genes D. expressing cardiac-specific transcription factors E. either undergoing apoptosis or expressing cardiac-specific transcription factors
In this diagram of a neuron, which item, A, B, C, or D, is an axon terminal?
1.A
2.B
3.C
4.D
The ABO blood types have __________ different
genotypes. a. 4 b. 6 c. 8 d. 12 e. 16