There are 20100 different possible sequence combinations for a protein chain with 100 amino acids. In addition to the amino acid sequence of the protein, what other factors increase the potential for diversity in these macromolecules?
(a) free rotation around single bonds during synthesis
(b) noncovalent interactions sampled as protein folds
(c) the directionality of amino acids being added
(d) the planar nature of the peptide bond
(a)
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Which of the following describes the function of epinephrine?
a. It increases heart rate, cardiac muscle contractions, and blood-glucose levels. b. It regulates the concentration of ions in urine, sweat, and saliva. c. It regulates blood-glucose levels. d. It triggers the formation of red blood cells in the bone marrow.
The steepness of the concentration gradient across the respiratory membrane affects gas exchange, with a steeper gradient ____
a. decreasing the rate of gas exchange b. increasing the rate of gas exchange c. decreasing the levels of carbon dioxide in the blood only d. increasing the levels of hemoglobin-bound oxygen only e. increasing the number of red blood cells
Which of the studies below provide evidence linking genes and behavior? (Check all that apply)
_____ Fruit flies that are mutant for the genes dunce or rutabaga have impaired learning. _____ Mice that are lacking either the ephrinB3 or the EphA4 gene cannot walk normally, but instead hop like a kangaroo. _____ Two lines of fruit flies were created by repeatedly selecting for high or low aggressive behavior. After multiple generations, the high line was reliably more aggressive than the low line. _____ Twin studies comparing monozygotic and dizygotic twins have found a high heritability for height, although environmental influences like nutrition also play a role. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about the genetics that underlies a behavior? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In negative control, what molecule would you expect to find bound to the operator if there is no transcription?
A) activator B) repressor C) inducer D) corepressor E) RNA polymerase