Using genetic engineering techniques, you remove the sequences that code for the ribosome-binding sequences of the bacterial LacZ gene. The removal of these sequences will lead to ___________
(a) more LacZ protein produced due to faster ribosome movement across the LacZ mRNA.
(b) transcriptional repression, resulting in fewer mRNA molecules produced from this gene.
(c) a longer half-life for the LacZ mRNA.
(d) translational inhibition of the LacZ mRNA.
(d)
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Which two organisms should be used to determine the validity of urea agar for quality control purposes?
a. P. fluorescens and B. cepacia complex b. Ralstonia mannitolilytica and Acidovorax delafieldii c. Brevundimonas diminuta and Brevundi-monas vesicularis d. B. vesicularis and R. pickettii
The electrochemical gradient that determines how a charged ion will move through a permeable membrane depends upon
A. the electrical forces acting on that ion. B. the difference in concentration of that ion on either side of the membrane. C. the ratio between the charge on the ion and its atomic mass. D. the combined effects of electrical forces and concentration differences across the membrane. E. All of the choices for this question are correct.
Over the past several decades, the overall trend for earth's temperatures has been
A. decreases in overall global temperatures at an accelerating rate, a phenomenon known as global cooling. B. a gentle trend towards colder winters and hotter summers, which averages out to be very little overall global temperature changes. C. cyclical periods of warming and cooling, known as global climate change. D. increases in overall global temperatures at an accelerating rate, a phenomenon known as global warming.
Perhaps the most direct evidence for evolution comes from:a
biogeography. b. comparative anatomy. c. developmental biology. d. the fossil record. e. molecular biology.