Which of the following characteristics of genetic material accounts for the need to get a flu vaccine every year, but a polio vaccine once in a life time?
A. transmission
B. variation
C. information
D. replication and transmission
E. replication
Answer: B
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Which of the following is correct regarding natural selection?
A. It is based on competition for resources B. Beneficial traits are passed on to the next generation C. It enables a species to become better adapted to its environment D. It may drastically change a species over time E. All of the answers are correct
The TATA box is a key element of the ____ of most eukaryotic protein-coding genes
a. terminator b. coding region c. promoter d. transcription start point e. introns
According to pressure-flow theory, how does sap move from the sieve tube into a sink?
A. a positive pump pressure B. osmosis of the dissolved sugars across the sieve tube and the sink plasma membranes C. a negative pump pressure D. gravitational action as phloem moves down from the source E. active membrane transport through the plasma membranes
A(n) ________ is a diagram in which blocks represent each trophic level
Fill in the blank(s) with correct word