Insulin and glucagon are produced by a:
A) small proportion of the cells in the pituitary.
B) large proportion of the cells in the pancreas.
C) large proportion of the cells in the adrenal glands.
D) small proportion of the cells in the pancreas.
Answer: D
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Small chromosomal duplications provide raw material for the addition of genes into a species' genome. These duplications create two or more copies of the same gene, where one or both of the genes can subsequently mutate. These genes are referred to as
A. sister chromatids. B. homologous chromosomes. C. homologous genes. D. transposable elements. E. duplicated chromosomes.
The molarity of a solution is
A. often expressed as grams per unit volume. B. a scientific term for determining the solubility of a substance in water. C. a measure of solute concentration. D. reflects a measure of the amount of oil dissolved in water. E. the weight of a solid substance.
During gastrulation, the cellular process by which ectoderm in the animal pole spreads toward the vegetal pole is called
A. epiboly. B. invagination. C. involution. D. convergent extension. E. apical constriction.
The structure labeled "A" in this figure of a replication fork represents ____
a. single-stranded binding protein b. primase c. DNA ligase d. helicase e. DNA polymerase