Carbon-12 and carbon-13 are different in the number of their _____.

Answer the following statements true (T) or false (F)

1. Proteins can have separate domains with distinct structures and functions. 2. The primary structure of a protein ultimately determines its three-dimensional structure. 3. All amino acids within a protein are either polar charged or polar uncharged. 4. The four nucleotide bases found in DNA are identical to those in RNA.

A DNA molecule that can accept foreign DNA and be replicated inside a host cell is known as a ____

a. genetic probe b. DNA library c. recombinant DNA d. cloning vector e. restriction enzyme

How many molecules of glycerol (; molecular mass = 92) would be present in 1 L of a 1 M glycerol solution?

a) 92 × 6.02 × 10^23 b) 14 × 6.02 × 10^23 c) 1 × 10^6 d) 6.02 × 10^23 e) 6.02 × 10^26

The immunoglobulin class that is the only one capable of crossing the placenta is

A. IgA. B. IgE. C. IgM. D. IgG. E. IgD.