With regard to traits, attached earlobes is considered ____
a. a neutral trait
b. a beneficial trait
c. a mutation
d. deleterious
e. adaptive
ANSWER: a
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Which of the following statements about evolution of behavior is correct?
A) Natural selection will favor behavior that enhances survival and reproduction. B) An animal may show behavior that minimizes reproductive fitness. C) If a behavior is less than optimal, it will eventually become optimal through natural selection. D) Innate behaviors cannot be altered by natural selection.
Why is eating carrots thought to be useful for enhancing vision?
A. High levels of chlorophyll in carrots helps with photosynthesis in the eyes. B. High levels of beta-carotene can lead to the production of a pigment used in vision. C. High levels of carotenoids in carrots can allow vertebrate eyes to perform the dark reactions. D. High levels of NADPH in carrots can allow vertebrate eyes to perform the light reactions.
Small RNAs can regulate gene expression. One type, called micro RNA (miRNA), acts by binding directly to
A. mRNA to prevent translation. B. tRNA to prevent transcription. C. mRNA to prevent transcription. D. tRNA to prevent translation.
Design a complete ecosystem that would sustain a number of living organisms for several years in a
sealed container. The only thing that can be added is sunlight. Explain why you have selected each organism. What will be an ideal response?