The most common type of population distribution is ____
a. clumped
b. uniform
c. random
d. near-uniform
e. semi-random
ANSWER: a
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When pair-rule genes and segment-polarity genes are mutated, larvae display disturbances in segmentation patterns
A. true B. false
Malpighian tubules are lined with which of the following to increase their absorptive surface area?
a. nephridia b. transport vesicles c. microvilli d. lysosomes
In the ecosystems of the world, fungi act primarily as
A. primary consumers. B. producers. C. decomposers. D. detritovores. E. secondary consumers.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to radioactively label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogen atoms. Thus, labeling the nitrogen atoms would provide a stronger signal than labeling the phosphates. Why won't this experiment work?
a) Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive b) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long c) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins d) There is no radioactive isotope of nitrogen