After 24 hours incubation of a facultative anaerobic bacterium in the 'Lysine Iron Agar', Yellow Butt can be interpreted as
A. The pH decreased
B. The pH did not change during the incubation
C. The pH is increased following an initial decrease
D. The pH is decreased following an initial increase
E. The pH change is irrelevant
Ans: A. The pH decreased
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Imagine that you are a medical student working in a cancer research laboratory. Your boss has given you samples of cancer cells and blood from a patient
She has told you that the cells have no mutations in any of their signaling molecule proteins (i.e., all the proteins are normal), but the cells' signaling transduction properties are not normal, causing them to be cancerous. Which of the following could account for the increased cell proliferation in the patient? A. The cells taken from the patient have more growth factor receptors than normal. B. The concentration of a signaling molecule in the patient is higher in the patient than usual. C. The cells taken from the patient exhibit a reduced level of signal amplification. D. Both A and B. E. A, B, and C.
Research comparing chromosomal structure between the genomes of humans and other primates reveals that humans
are most closely related to ____.
a. monkeys b. orangutans c. chimpanzees d. gorillas e. lemurs
Glycolysis literally means
a. energy producing. b. Embden-Meyerhof. c. sugar producing. d. sugar splitting.
The stain shown in Image A may be unsatisfactory following fixation in:
a) Carnoy solution b) Bouin solution c) B-5 solution d) 10% buffered formalin