Which of the following is an example of the prevention of cellular signaling?
A. The nicotine in cigarette smoke binds to
and activates the acetylcholine receptor in
plasma membranes of neurons in the brain.
B. Proteins on the surface of cells in taste
buds called umami receptors bind to
glutamates and nucleotides in food which
changes the membrane potential of these
cells and tells the brain, "This is savory."
C. Allergy medicines called antihistamines
bind to and block histamine receptors to keep
fluids in capillaries that would normally be
released and cause stuffy noses and watery
eyes.
C
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Individuals who have an active case of tuberculosis may spread the disease simply by ________ uninfected individuals
A) coughing near B) shaking hands with C) hugging D) sexual contact with
Bacteria contain plasmids because
A. they are essential for growth. B. they provide genes that allow the bacteria to grow and thrive in the presence of potential toxins. C. they are essential for cellular respiration. D. humans artificially created plasmids and then inserted them into bacteria. E. they are essential for chromosome replication and binary fission.
Members of this lineage are highly active, have a closed circulatory system, and have a high oxygen
requirement.
a. Cephalopoda b. Polyplacophora c. Bivalvia d. Gastropoda e. Scaphopoda
The total resources a population consumes and the wastes it produces is its ____
a. ecological footprint b. vital capacity
c. carrying capacity d. non-renewable resources e. limiting factor