Which of the following can affect a small, endangered population so severely that it goes extinct?
A) Lost alleles and/or low genetic diversity
B) Increased mating opportunities
C) Sexual selection
D) Artificially adding new genes
E) Matings with a closely related species
A
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A thin layer chromatogram is useful for
(a) measuring the amount of photosynthesis. (b) determining the amount of gas produced during photosynthesis. (c) separating pigments based on their physical characteristics. (d) determining the presence of sugars in a leaf.
In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with virus. This activity can be attributed to
A) the presence of transposons integrating into polymerase genes. B) the presence of viroids. C) the presence of retrotransposons. D) infection with small bacteria known as mycoplasmas. E) a novel prion infection.
Crossing over occurs during ______________________
a. prophase I. b. prophase II. c. telophase II. d. metaphase I.
The stomach is an extremely hostile place. What protects it from digesting itself?
What will be an ideal response?