Phenotypes can be positive, negative, or neutral in a population. A sharp contrast between balanced polymorphism and the three types of natural selection is that in balanced polymorphism

A. not only are multiple alleles persistent in a population, but all may be preserved.
B. multiple alleles of a gene persist indefinitely in a population.
C. many traits persist by only a single allele.
D. polygenic traits in a population may mask the observation of extreme or intermediate phenotypes.
E. all phenotypes may be preserved in a population.


A. not only are multiple alleles persistent in a population, but all may be preserved.

Biology & Microbiology

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Prions are created when normal proteins in the body ____

a. combine with large ribosomal subunit and become infectious b. exchange several long sections of amino acids with other infected proteins c. refold into a different and infectious three-dimensional shape that kills cells in the brain and nervous system d. undergo mutation and create hundreds of copies of themselves e. invade the immune system, causing it to mistakenly destroy the body's healthy tissue

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Which of the following statements is false?

1.Neurons in the brain can interpret incoming action potentials only in certain ways. 2.Optic nerve impulses can only be interpreted as light. 3.Some sensory receptors do not convert a stimulus to nerve impulses. 4.The stronger the stimulus, the more action potentials are generated. 5.A strong stimulus activates many adjacent receptors, thereby increasing the number of action potentials and the level of awareness of the stimulus.

Biology & Microbiology

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What will be an ideal response?

Biology & Microbiology

A charged tRNA with the anticodon 5' AUG 3' would carry which amino acid?

a. Phe b. His c. Met d. Val

Biology & Microbiology