Which molecule, a product of hemoglobin metabolism, does the liver excrete through bile?
a. alcohol
b. bilirubin
c. cholesterol
d. bicarbonate
e. urea
ANSWER: b
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Prokaryotes
A. lack a true nucleus. B. lack true DNA. C. use the cell membrane rather than ribosomes for making proteins. D. contain numerous organelles. E. are relatively benign cells incapable of harming organisms.
Repressible operons require that ________ binds to the repressor protein before it can bind to the operator.
A. a cofactor B. the substrate C. the product D. the reactant E. a coenzyme
Which base pairs with adenine in a DNA molecule?
a. adenosine b. cytosine c. thymine d. guanine e. uracil
Hemoglobin
a. tends to give up oxygen in regions where partial pressure of oxygen exceeds that in the lungs. b. tends to hold onto oxygen when the pH of the blood drops. c. tends to release oxygen where the temperature is lower. d. releases oxygen more readily in highly active tissues. e. may bind up to 16 molecules of oxygen.