Please match the diseases with their most common portal of exit.
Infectious mononucleosis
A) Respiratory tract (aerosols)
B) GI tract (saliva droplets)
C) Exudates from skin lesions
D) GI tract (diarrhea)
E) Reproductive tract (semen)
F) Blood through a contaminated needle
B) GI tract (saliva droplets)
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A cross of a true-breeding smooth pod and yellow pod plants results in all smooth pod offspring. This indicates that
A. yellow is dominant and smooth is recessive. B. smooth is dominant and yellow is recessive. C. yellow and smooth are not alleles. D. yellow and smooth are variants of the same gene. E. two of the answers are correct. Yellow and smooth are variants of the same gene, and smooth is the dominant trait.
When the predator population is above the prey isocline, the prey population is
a. increasing b. decreasing c. neither increasing nor decreasing
Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?
a. The active transport of glucose b. The very fast turnover rate of glucose metabolism c. The ability of the cell to engulf glucose by pinocytosis d. The continuous excretion of glucose from other parts of the cell e. The rapid and continuous addition of phosphates onto the glucose molecules
Which of the following events would be controlled by an external signal?
A) Cell division. B) Prophase proceeds into metaphase. C) The chromosomes align at the equatorial plane before the cell begins anaphase. D) All of the DNA is copied before the cell enters into the G2 phase. E) All of these are controlled by an external signal.