Antibodies are _____
a. antigen receptors c. proteins
b. made only by B cells d. all of these
D
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Which of the following statements does NOT describe an attribute of conifer resin?
A. It hardens on contact with air. B. It forms amber. C. It traps insects and other organisms. D. It is an antibiotic and prevents infections. E. It flows through ducts in the wood and leaves.
Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:
A. producing sufficient surface tension to overcome the pull of gravity. B. having a strong cohesive force and attaching to the surrounding vessel walls. C. storing heat and thus moving faster because of heat of vaporization. D. having an adhesive force, which allows them to attach to the vessel walls. E. being associated with hydrophobic molecules, which can result in upward movement.
Which of the following statements concerning archaea in the microbiome is correct?
A. The human body is a hostile environment for archaea. B. Archaea evolved under extreme conditions and are not commensal with humans. C. Archaeal infections are treated with translation inhibitors, as their ribosomes are the same as bacterial ribosomes. D. Methanogens are associated with anaerobic regions of the gut and the gingival pockets.
Ephedra, evergreen desert shrubs, are in which of the following plant groups?
a. cycads b. gnetophytes c. conifers d. ginkgos e. angiosperms