If a plant contains seven bud scale scars this would indicate that the plant is ________ years old.
A. seven
B. four
C. fourteen
D. You cannot tell the age of a plant by the number of bundle scars.
Answer: A
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T cells produce and secrete factors that do not directly interact with invading microorganisms but that augment the body's defense mechanisms. These molecules are called ________.
A. augmetins B. antibodies C. cytokines D. immunogens
Which of the following statements about the types and subtypes of the influenza (flu) virus is FALSE?
A. Of the three major types of flu virus (A, B, and C), only Type A can occur in humans, other mammals, and birds. B. Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus. C. The A(H2N2) and the A(H3N2) strains of the virus require different vaccines. D. High mutation rates create more diversity in strains of flu than does genetic recombination. E. Genetic recombination between influenza and other types of viruses is common.
What property describes the plasma membrane's ability to regulate movement of molecules into and out of the cell?
a. polarity b. integrity c. permeability d. solubility
The dark middle layer of the eye that prevents the scattering of light is the
a. fovea. b. retina. c. sclera. d. choroid. e. cornea.