Chemical reactions in which large molecules are built from small molecules are classified as ______ reactions. In contrast, ______ reactions involve breaking large molecules down into smaller ones.

Did genomic Eve ever know genomic Adam?

What will be an ideal response?

Tritiated hydrogen (3H) differs from hydrogen (1H) in that

A. 3H has 2 more protons than 1H. B. 3H has 2 more electrons than 1H. C. 3H has 2 more neutrons than 1H. D. 3H has the same number of neutrons as 1H. E. 3H has a different electron configuration than 1H.

How many planes divide the body of a biradially symmetric animal into two equal parts?

a. none b. 1 c. 2 d. 4 e. more than 4

Arctic foxes typically have a white coat in the winter. In summer, when there is no snow on the ground, the foxes typically have a darker coat. Which of the following is most likely responsible for the seasonal change in coat color?

(A) The decrease in the amount of daylight in winter causes a change in gene expression, which results in the foxes growing a lighter- appearing coat. (B) The diet of the foxes in summer lacks a particular nutrient, which causes the foxes to lose their white coat and grow a darker- colored coat. (C) Competition for mates in the spring causes each fox to increase its camouflage with the environment by producing a darker- appearing coat. (D) The lower temperatures in winter denature the pigment molecules in the arctic fox coat, causing the coat to become lighter in color.