Which of the following will you be using to observe mitosis?
Answer: Onion root tip
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From an evolutionary standpoint, which of the following organisms would be the most fit?
a. a tree that produces thousands of seeds, of which three grow to sexual maturity b. a bird that produces offspring, of which three survive to reproduce c. an elephant that has a single offspring that nurses for 8 months and reaches sexual maturity in 10 years d. both (a) and (b)
“Individuals change over the course of their lifetime and therefore evolve.” Why is this statement a misconception regarding evolution?
a. Individuals do not change over their lifetime b. The changes seen in an individual over their lifetime can be attributed to development, not evolution c. Individuals only change until puberty stops, so this is not evidence for evolution d. Individuals only change until they reach 40 and then stop, so this is not evidence for evolution
In which example are the proximate cause and the ultimate cause of morphological evolution correctly matched?
A. Proximate: point mutations in protein coding genes affect protein function and structure, ultimate: chemical and physical configuration of a protein affect its function B. Proximate: cis-regulatory elements are found upstream of a gene; ultimate: cis regulation is required to activate a gene C. Proximate: natural selection causes morphology to differ among species, ultimate: natural selection prevents morphological variation within a species D. Proximate: changes in gene regulation lead to changes in morphology; ultimate: natural selection favors morphologies that work best in their environment E. Proximate: natural selection favors gene combinations that have high fitness in their environment; ultimate: genetic changes alter morphology and fitness
The cochlea is
A) a coiled structure found in the inner ear. B) part of the organ of Corti. C) involved in the maintenance of body temperature. D) part of the middle ear.