Which of the following lymphocytes secretes large quantities of antibodies?
A) B cells
B) T cells
C) Natural killer cells
D) All of the above
Ans: A) B cells
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During DNA replication, the leading strand is synthesized continuously, whereas the lagging strand is synthesized as Okazaki fragments. Why is this so?
A. There are thousands of origins of replication on the lagging strand, but only one on the leading strand B. DNA polymerase can only bind on one strand at a time C. DNA synthesis can only take place in the 5' to 3' direction D. DNA strands are baked in the oven for 40 minutes at 200 degrees Celsius
The protist Stentor contracts when it is touched for the first time but gradually stops retracting if the touching is continued. This behavior is called
A) habituation. B) a sensitive period. C) imprinting. D) insight learning. E) operant conditioning.
When scientists placed ATP Synthase linked to fluorescent actin on a microscope slide and added ATP, the actin could be seen spinning counterclockwise. If the experiment could be replicated in a cell going through oxidative phosphorylation what would happen?
A. The actin would spin counterclockwise because ATP would be produced instead of hydrolyzed. B. The actin would spin counterclockwise because ATP would be hydrolyzed. C. The actin would spin clockwise because ATP would be produced instead of hydrolyzed. D. The actin would spin clockwise because ATP would be hydrolyzed.
What germicidal category has demonstrated better effectiveness as liquid disinfectants?
A. Hydrogen peroxide B. Aldehydes C. Hypochlorites D. Ethylene oxide