Which of the following is closest to a micrometer in size?
A) the width of a strand of DNA
B) the length of a plant cell
C) the length of a chicken egg
D) a typical prokaryotic cell
E) the size of a ribosome
Answer: D
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Why is the pharmacological reactivation of fetal hemoglobin in a patient with sickle-cell anemia often a successful treatment? Fetal hemoglobin _____
A) binds more carbon dioxide molecules than adult hemoglobin B) is better able to release oxygen than is adult hemoglobin C) has a higher affinity for oxygen than does adult hemoglobin D) is better able to release carbon dioxide than is adult hemoglobin E) has a higher affinity for carbon dioxide than does adult hemoglobin
Active transport mechanisms
a. in roots regulate what solutes enter the plant. b. in leaves help control water loss. c. operate in animal kidneys and neurons. d. do all of these. e. do none of these.
Figure 40.5B
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Use the figure above showing the structure of the human kidney to answer the following question.
Fluid is reabsorbed from peritubular capillaries and returned to blood circulation via the structure indicated by the letter ____.
A. A B. B C. C D. D E. E
A red blood cell placed in a hypertonic medium will
What will be an ideal response?