Which medium can be described as a nutritionally rich medium used to grow various microor-ganisms, either as a broth or as an agar, with or without added blood?
a. Chocolate
b. Colistin, nalidixic acid (CNA) blood
c. Brain-heart infusion (BHI)
d. Thioglycollate broth
C
BHI is a nutritionally rich medium that is used as both a broth and as an agar and comes with or without added blood.
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Species of the genus Gardnerella
A. are normal flora found on the skin of humans. B. are motile spore-forming cocci. C. are thought to be a major cause of bacterial vaginitis. D. All of the choices are correct.
Which sentence best describes the situation that occurs when an enzyme and its substrate interact?
a. Just after substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate. b. Just before substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate. c. Just before substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme. d. Just after substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme.
Clusters of _______ in membrane proteins such as band 3 of the erythrocyte can define hydrophilic segments through which ions (for example, bicarbonate and chloride) can be transported.
a. oligosaccharide side chains b. lipid modifications c. transmembrane ? helices d. phosphorylation motifs
Saturated fats are usually found in:
A) coconut oil. B) a beef steak. C) safflower oil. D) both coconut oil and a beef steak. E) canola oil.