In mammals, Hox genes:
A. specify limbs and other structures
associated with each body segment.
B. direct development of structures that
become parts of the hindbrain, spinal cord,
and vertebral column.
C. evolved by partial-genome duplication
from the ancestral genes.
D. are expressed in a sequence that does not
reflect their linear order on the chromosome
or the regions they affect.
E. All of these choices are correct.
B
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The lungs are protected from microorganisms by
A. the mucociliary blanket. B. phagocytic action of alveolar macrophages. C. lysozyme in mucus. D. All of the choices are correct.
A utilitarian approach to a bioethical issue would ________
A) focus on absolute principles of "right" or "wrong" B) emphasize intentions, not outcomes of the decision C) be designed to produce the greatest positive effect for the greatest number of people D) always ensure that all actions are favorable for all parties E) never allow the end result of a decision to justify the means
________ are small pieces of DNA separate from the bacterial chromosome
Fill in the blank(s) with correct word
Why are neocallimastigomycetes being studied for biofuel production?
A. They can degrade pollutants and toxins into benign substances. B. If provided with an aerobic environment, they can break down cellulose and lignin. C. They can break down cellulose and lignin in a hot, anaerobic environment. D. They can use their hydrogenosomes to generate methane.