Which lists the stem cells from the least to the highest degree of flexibility?
A) embryonic stem cells < adult stem cells < zygote
B) embryonic stem cells < zygote < adult stem cells
C) adult stem cells < zygote < embryonic stem cells
D) adult stem cells < embryonic stem cells < zygote
D
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The process by which soil bacteria convert NH3 or NH4 to nitrate (NO3-) is called
A. assimilation. B. denitrification. C. fixation. D. nitrification. E. ammonification.
Which of the following organs of the endocrine system secretes melatonin?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
As an erythroblast develops into an erythrocyte, it
A) becomes filled with clotting proteins. B) begins to manufacture platelets. C) loses its ability to reproduce. D) takes on the characteristics of an immature monocyte. E) undergoes active aerobic metabolism.
How do some inhibitors slow down metabolic pathways when the products of the pathways are not needed but still allow a pathway to proceed when the products are needed?
A. Inhibitors promote an induced fit between a substrate and an enzyme's active site. B. feedback regulation C. enzyme activation D. Inhibitors usually degrade enzyme molecules.