Predict which food item would be most effective at increasing metabolic rate via digestion of same.
A. baked potato
B. meat
C. cola
D. butter
Answer: B
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Frameshift mutations may involve _____
a. the substitution of nucleotides b. the substitution of codons c. the substitution of amino acids d. the insertion of one to several base pairs e. mutations in the promoter
What do capsules protect bacteria from?
a. osmotic lysis b. invaders c. radiation d. viruses
In T4 phages, which of the following makes the initial contact with the appropriate receptor site?
A. Tail fiber B. Tail tube C. Collar D. Base plate
Investigators decide to analyze the purity of a preparation of antibody molecules using SDS polyacrylamide-gel electrophoresis (SDS-PAGE). On Lane 1 of the gel, they load a sample of the antibody. On Lane 2, they load an antibody sample that has been treated with a reducing agent called mercaptoethanol, which breaks disulfide linkages. Following electrophoresis, they see distinct bands representing polypeptides with molecular weights of 50 kD and 25 kD in Lane 2 and only one band weighing 150 kD in Lane 1. What can the investigators conclude about their antibody based on the results of this experiment?
A.) their antibody preparation was pure; the 50-kD and 25-kD polypeptides are subunits of the mature antibody that were together by noncovalent bonds B.) their antibody preparation as not pure because it contains polypeptides of different molecular weights in Lane 2 C.) their antibody consists of a single polypeptide chain of 150 kD; treatment with mercaptoethanol cleaves the polypeptide backbone at random sites D.) their antibody is composed of subunits (50 kD and 25 kD in molecular weight) that each must include at least one cysteine residue E.) their antibody consists of a single polypeptide chain of 150 kD; treatment with mercaptoethanol cleaves the polypeptide backbone at specific sites