When viewing a nearby object ____
a. the focal point is centered on the optic disc
b. the focal point moves farther away
c. the ciliary body muscle is contracted
d. the lens flattens
e. parallel light rays strike the retina
ANSWER: c
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Answer the following statements true (T) or false (F)
1. Technically speaking, all antibodies are immunoglobulins, but not all immunoglobulins are antibodies. 2. IgG is the largest of the five classes of immunoglobulins. 3. The primary function of NK and K cells is to kill foreign cells, virus-infected cells, and tumor cells. 4. Common allergic reactions, such as those experienced in hayfever, are also known as anaphylactic reactions. 5. IgM antibodies and basophils play major roles in anaphylactic reactions.
How do the constituents of liquid medium differ from solid, gel-like medium?
a. Liquid medium contains agar, a polysaccharide extracted from algae. b. Solid medium contains agar, a polysaccharide extracted from algae. c. Solid medium contains agar, a complex lipid extracted from bacterial membranes. d. Liquid medium contains more salts, which lower the freezing point. e. Solid medium contains more fatty acids, which raise the melting point.
F+ cells ____
a. are able to conjugate with donor cells b. are able to conjugate with recipient cells c. are able to conjugate with other F+ cells
d. receive DNA during conjugation e. are infected with a virus
In a particular breed of flowering plants, two genes on the same chromosome determine flower color and leaf color. For flower color, blue (B) is dominant to pink (b), and for leaf color, white (W) is dominant to green (w)
A true-breeding plant with blue flowers and white leaves is crossed with a plant that has pink flowers and green leaves. The offspring are observed and the following phenotypes are tallied. blue flowers and white leaves: 370 plants blue flowers and green leaves: 14 plants pink flowers and white leaves: 12 plants pink flowers and green leaves: 363 plants What is the frequency of recombination between these two genes?