Which one of the following is correct regarding the structure of an antibody?
A) An antibody is made up of two polypeptide chains linked by hydrogen bonds.
B) The four polypeptide chains that make up an antibody molecule are linked by disulfide bonds.
C) The constant regions of the polypeptides in an antibody form antigen-binding sites.
D) Only one polypeptide in an antibody has a constant region and a variable region.
E) The polypeptides making up an antibody are connected by hydrogen bonds.
B
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Which of the following is most closely related to the lobe-finned fishes?
a. ray-finned fishes b. tunicates c. mammals d. cartilaginous fishes e. lancelets
A red blood cell is placed in a solution. After a period of time, the cell has shrunk to half its original size. Which of the
following is true? a. Water moved from the solution into the cell. b. The solution inside the cell is hypertonic. c. The cell was placed in a hypertonic solution. d. The cell was placed in an isotonic solution. e. Salt left the cell resulting in its change in size.
What are VNTRs?
A) fragments of DNA that have been denatured B) nucleotide sequences that correspond to specific genes C) distinct nucleotide sequences that everyone has in different numbers D) nucleotide sequences that are different in different individuals
The head louse and body louse both are of the genus
a) Trichophyton. b) Candida. c) Sarcoptes. d) Pediculus.