Which of the following designates a normal human
female?
a. XXY
b. XY
c. XX
d. XYY
e. XO
Answer: c
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"Rice-water stools" are associated with disease caused by which organism?
A. Vibrio parahaemolyticus B. Vibrio cholerae C. Helicobacter pylori D. Campylobacter jejuni E. Vibrio vulnificus
Which of the following is true of the adrenal medulla?
1.It controls sodium and water reabsorption in kidneys. 2.It releases norepinephrine into the blood. 3.It secretes sex hormones. 4.It decreases cortisol level in the blood.
The human X and Y chromosomes _____
A) are both present in every somatic cell of males and females B) are the same size and have the same number of genes C) include genes that determine an individual's sex D) are called autosomes
Chlorophyll's most important role during photosynthesis is:
A) keeping the leaves of plants green. B) capturing electrons that can, in turn, be used by carotenoids. C) turning color in the autumn each year. D) converting light energy from the sun into chemical energy. E) turning into a molecule of ATP upon being struck by sunlight.