Which one of the following statements about cyanobacteria is false?
A) Although cyanobacteria are photosynthetic, they do not produce oxygen as a result of
photosynthesis.
B) At one time, cyanobacteria were called blue-green algae.
C) Some cyanobacteria are capable of nitrogen fixation.
Answer: A
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In mammals, most gas exchange between the atmosphere and the pulmonary blood occurs in the _____
A) trachea B) larynx C) bronchi D) bronchioles E) alveoli
In individuals with normal blood sugar levels, glucose is reabsorbed into the bloodstream in the kidney by members of the GLUT transporter family, which form an aqueous pore across the membrane through which glucose can move passively. As a result, no glucose is excreted in urine. However, in people with untreated diabetes mellitus, blood sugar levels are high and glucose is often present in the
urine. What can explain this occurrence? A. High blood glucose levels reverse the concentration gradient, allowing untransported glucose to be excreted in urine. B. High blood glucose levels interfere with the coupled transport of water and glucose, allowing untransported glucose to be excreted in urine. C. The GLUT transporters become saturated, allowing untransported glucose to be excreted in urine. D. The GLUT transporters cannot hydrolyze ATP quickly enough for ATP to transport the extra glucose, thereby allowing untransported glucose to be excreted in urine.
The structures labeled 2 in Figure 43-2 are the:
a. ampullae.
b. cochleae.
c. utricles.
d. semicircular canals.
e. bony labyrinth
Which of the following cell contain a nucleus?
a. bacteria b. prokaryotes c. eukaryotes