A pregnant woman is told she has a positive CAMP test and should be treated with a course of antibiotics and globulin. This test is indicative of
A. Group A streptococci.
B. Group B streptococci.
C. S. saprophyticus.
D. S. epidermidis.
E. S. aureus.
Answer: B. Group B streptococci.
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In twin studies, scientists measure _____, which is defined as _____
A. heritability; the extent to which variation in phenotype in a population is due to variation in genotype. B. concordance; the percentage of cases in which both members of a pair of twins show the trait when at least one member shows it. C. concordance; the percentage of cases in which both members of a pair of identical twins, but not fraternal twins, show the trait when at least one member shows it. D. concordance; the percentage of cases in which both members of a pair of fraternal twins, but not identical twins, show the trait when at least one member shows it. E. concordance; the extent to which differences in the environment influences differences in phenotype.
Sea snakes usually feed on
a. algae. b. jellyfish. c. infaunal invertebrates. d. small fishes. e. epibenthic invertebrates.
The kelp shown in the accompanying figure represents the ____ stage in its life cycle
a. spore-bearing b. gamete-forming c. haploid d. motile e. feeding
The mesophyll layer of leaves is important to plants because
A. it keeps the plant from drying out. B. it anchors the plant to the soil. C. most of the photosynthesis occurs here. D. most of the water needed for photosynthesis is absorbed here.