The digestive structure that stores concentrated bile is the ____
a. duodenum
b. gallbladder
c. liver
d. pancreas
e. stomach
ANSWER: b
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Control of the lac operon and lactose utilization in bacteria is
_____ not induced in the presence of both glucose and lactose. _____ only induced when there is glucose but not lactose. _____ is a negative control, mediated by a repressor. _____ controlled by the expression of three downstream genes. _____ preferentially utilizing lactose as a carbon source.
Briefly define the term genetic equilibrium
What will be an ideal response?
In double fertilization, one sperm fuses with the egg, and the other sperm fuses with the two antipodal nuclei. Indicate whether the statement is true or false
Which of the following statements is true?
(a) Peptide bonds are the only covalent bonds that can link together two amino acids in proteins. (b) The polypeptide backbone is free to rotate about each peptide bond. (c) Nonpolar amino acids tend to be found in the interior of proteins. (d) The sequence of the atoms in the polypeptide backbone varies between different proteins.