Which is a likely result of a mass extinction?
a. The creation of “empty niche spaces,” which can stimulate radiation of surviving groups.
b. The elimination of non-beneficial alleles from gene pools.
c. The increase in the rate of new mutations in remaining species.
d. The decrease in the rate of new mutations in remaining species.
e. The introduction of mutations that have a greater than usual effect.
ANSWER: a
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If cells of an individual contain the same set of genes, how do these cells become different from each other during development?
A) Different cell type-specific regulatory elements in DNA are created during development. B) Different cell type-specific regulatory elements in DNA are selectively lost during development. C) Differences in extracellular signals received by each cell lead to differences in the types of regulatory proteins present in each cell. D) Differences develop in promoter sequences that lead to different signals being produced by each type of cell.
The ____ is the largest organ in the human body
a. brain b. lungs c. liver d. stomach e. skin
The most common cancer in woman is cancer of the ____
a. blood b. skin c. colon d. lung e. breast
What will always have an equal percentage of A and G, and an equal percentage of C and T?
What will be an ideal response?