Which of the following pairings of recombinant DNA techniques and applications does NOT match?
a. genetic modification of yeast: production of purified insulin
b. gene therapy: replacing a defective gene
c. PCR: making many copies of a segment of DNA
d. gene silencing: production of subunit vaccines
Answer: d. gene silencing: production of subunit vaccines
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When an allele can produce a range of phenotypes, its expression is said to be
a. clearly established. b. variable. c. codominant. d. incompletely dominant. e. incompletely penetrant.
What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules. B. Odors are distinguished by the way in which they bind both olfactory and taste receptors-it is the overall "picture" generated this way that we perceive. C. Many different types of odors bind to just a few different types of receptor molecules. D. None of the answers are correct.
Two kinds of birds eat the same food and nest in the same area. These two species of birds are in
a) competition b) equilibrium c) parasitism d) mutualism
Which component of the lower respiratory tract is incorrectly matched with a function or description?
A) alveoli: site of gas exchange B) lungs: contain the alveolar sacs C) bronchi: direct air to the lungs D) bronchioles: have ciliated mucous membranes E) larynx: contains the mucociliary escalator