What results when traits are acted on by sexual selection?
A) The traits increase fertility.
B) The traits occur mostly in females.
C) The traits sometimes appear to have no relation to fitness.
D) The traits occur in plants but not in animals.
C
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Which of the following statements is true about the net movement of an ion across a membrane by passive diffusion through a membrane channel?
a. For every ion that diffuses through the membrane, a different ion diffuses in the opposite direction. b. The cell expends energy as the ion passes through the membrane. c. The charge on the other side of the membrane is generally the opposite of the ion's charge. d. There is a higher concentration of ions on the side of the membrane toward which the ion diffuses.
A(n) ________ is to bacteria as a ________ is to animal cells
A) retrovirus... virus B) phage... prophage C) prophage... provirus D) RNA virus... DNA virus
BSE or 'Mad Cow Disease' are probably caused by Prions. Prions may be classified as:
A. Protozoa B. Viruses C. Genetic material particles (DNA) D. Bacteria E. Proteinaceous material
Specialized outgrowths of the plant epidermis called ____ are hairlike projections, such as root hairs
a. cuticles b. protoplasts c. stomata d. trichomes e. bark