Although glucose molecules constantly diffuse into a cell along their concentration gradient,
equilibrium is never reached and glucose continues to enter the cell. This is a direct result of:
a. the very fast turnover rate of glucose metabolism.
b. the continuous excretion of glucose from other parts of the cell.
c. the rapid and continuous intracellular formation of glucose phosphates.
d. the active transport of glucose.
e. the ability of the cell to engulf glucose by pinocytosis.
C
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Tetrazolium chloride is used by the seed industry to indicate
(a) if a seed is undergoing photosynthesis. (b) if seeds are undergoing aerobic respiration. (c) if seeds are alive. (d) both b and c.
Annual growth rings are formed in woody stems
principally through the activity of the a. pericycle. b. pith. c. vascular cambium. d. mesophyll. e. endodermis.
An older adult is complaining of an intensely painful rash that has appeared as a patch on one side of his chest. This description is consistent with
A) chickenpox. B) roseola. C) shingles. D) smallpox. E) whitlow.
Which statement is not true about the resident microbiota of the respiratory tract?
A) Resident microbiota secrete antimicrobial peptides and compete with pathogens. B) Smoking affects the numbers and types of species in the microbiota. C) Microbiota are only found in the upper respiratory tract. D) The lungs have recently been found to contain a resident microbiome that resembles that found in the mouth. E) The resident microbiota of a healthy person is limited to just a few species of bacteria.