Which of the following is true about the role normal microbiota plays in maintaining host health?
A. They provide a surface that is incompatible for attachment of an invader.
B. They establish competition for nutrients and vitamins.
C. They produce antimicrobial substances.
D. They stimulate the immune system.
E. All of the choices are true.
E
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In an experiment, the development of the frontal lobe of a rat was inhibited. Predict the most likely consequence of
this procedure.
a. The rat was not able to make noises. b. The rat was unable to move. c. The rat was unable to detect touch. d. The rat was not able to process visual input. e. The rat could not hear.
How many kinds of gametes will be expected from an individual with the genotype PpCcTTRr?
What will be an ideal response?
What was Lamarck's idea about how organisms changed?
A) He proposed that body parts changed as a result of extra use or disuse. B) He proposed that variations in populations were selected by the environment. C) He proposed that all organisms were unchanging over time. D) He proposed that humans evolved from fish.
Conjugation is a process in which:
a. a virus, containing pieces of bacterial DNA that it inadvertently picked up from its previous host, infects a bacterial cell. b. a bacterial cell bursts open, releasing short lengths of DNA, which are taken up by another bacterial cell and inserted into its own genome. c. exact copies of a bacterial cell's DNA are transferred into daughter cells. d. a bacterium transfers a copy of some or all of its DNA to another bacterium.