When a cell loses telomerase activity, what is the predicted effect?
A) Telomeres will increase slightly with each cell division.
B) After 30–50 divisions, the cell will show signs of senescence and then die.
C) An immune stem cell will increase white blood cell production.
D) A normal somatic cell will gain the ability to divide indefinitely.
E) The cell will die immediately.
B) After 30–50 divisions, the cell will show signs of senescence and then die.
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A bacterium with which metabolism is MOST likely to form a relationship with Syntrophobacter wolinii?
A) acetate oxidation B) ammonia oxidation C) molecular hydrogen oxidation D) propionate catabolism
What nucleotide change is a shared derived character for species A, B, and C, but not for species G?
A,T,G, and C refer to nucleotide bases, and the numbers refer to the position of the base in the nucleotide sequences.
For example, A6 refers to an adenine at the sixth position.
A. Changing the second G to an A is common to species A, B, and C, but not to species G.
B. Changing the fifth T to a G is common to species A, B, and C, but not to species G.
C. Changing the second G to a T is common to species A, B, and C, but not to species G.
D. Changing the second G to an A and the fifth T to a G is common to species A, B, and C, but not to species G.
E. None of these show a change in derived characteristics for A, B, and C that are not found in G.
Apical dominance is an effect that causes ____
a. a directional adjustment of growth in response to environmental stimuli b. leaves and other plant parts to fall off, or senesce c. roots to lengthen while inhibiting shoot growth d. lateral buds to become active when a shoot is lengthening at its tip e. lateral buds to stay dormant when a shoot is lengthening at its tip
Which of the following statements about the role of fire in biomes / ecosystems is true?
A) Forest fires did not occur in the times before human settlement. B) Fires decrease the number of animal communities in ecosystems by destroying habitat. C) Forest fires are extremely destructive to ecosystems and should be put out as quickly as possible. D) Fire is essential to maintaining some ecosystems. E) Fire is not an important factor in developing and maintaining ecosystems.