Put the following steps in order:1
allolactose binds to the lac repressor protein
2. RNA polymerase binds to the promoter
3. the lac repressor is expressed
4. beta-galactosidase cleaves lactose and generates allolactose
5. mRNA is transcribed from the lac operon at low levels
6. beta-galactosidase, permease, and transacetylase are produced at high levels
a. 1, 3, 2, 5, 4, 6
b. 4, 1, 2, 3, 5, 6
c. 3, 5, 4, 1, 2, 6
d. 3, 4, 1, 6, 2, 5
e. 5, 3, 1, 2, 4, 6
C
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Which of the following best describes the characteristics of the ascending arm of the loop of Henle? (Select all correct choices.)
A. It is permeable to water. B. It actively transports electrolytes. C. It is impermeable to water. D. Its filtrate is mainly urea. E. Its filtrate becomes more and more concentrated.
What structure best represents a polymer?
A. A fatty acid. B. A monosaccharide. C. A nucleotide. D. An amino acid. E. A protein.
When a gamete that is lacking a sex chromosome due to nondisjunction has fused with a gamete carrying an X chromosome, this type of abnormality leads to ________.
A. Triple X syndrome B. Down Syndrome C. Edward Syndrome D. Turner syndrome E. Klinefelter Syndrome
A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as
A. osmosis. B. facilitated transport. C. diffusion. D. exocytosis. E. active transport.