Where are a mollusk’s gills located?
a. within the visceral mass
b. under the foot
c. in the mantle cavity
d. surrounding the radula
c. in the mantle cavity
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Laboratories that work with moderate risk pathogens are classified as
A) BSL-1. B) BSL-2. C) BSL-3. D) BSL-4.
Inbred lines of animals, such as laboratory mice, are useful for studying complex traits because:
A. individuals are genetically identical, so differences in traits must be due to environmental differences. B. although individuals differ both genetically and environmentally, the genetic differences are known, so differences in traits can be understood. C. animals are kept in identical environments, so any differences in traits are due to differences in their genes. D. both genetic and environmental differences between individuals are known, making differences in their traits easy to understand. E. None of these choices is correct.
Liver cells, mammary cells, and skin cells all contain the same genome; however, their respective proteomes vary drastically. This observation is best explained by what phenomenon?
A. gene splicing B. cell division C. cell differentiation D. crossing over E. evolution
An allele of the pea color gene specifies the enzyme Sgr, which normally functions in a pathway to break down chlorophyll during pea maturation, resulting in yellow mature peas. A second allele of the Sgr gene produces no enzyme and is the ________ allele.
A) dominant B) recessive C) wild-type D) functioning