Natural selection operates directly on
(a) the genotype.
(b) individual alleles.
(c) the phenotype.
(d) color only.
(a) the genotype.
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Cellulose is
a. the most complex of the organic compounds. b. a polymer of glucose and fructose. c. a polymer of glucose and galactose. d. a component of plasma membranes. e. a material found in plant cell walls
The most dangerous type of arrhythmia is
a. tachycardia. b. ventricular fibrillation. c. brachycardia. d. atrial fibrillation. e. an electrocardiogram
Which of the following cells has a plasma membrane?
A) an animal cell B) a plant cell C) a fungal cell D) a bacterial cell E. all of the above
Which association of structure and function is incorrect?
A. amnion - blood vessels B. chorion - gas exchange C. allantois - waste storage D. yolk sac - food storage