The longer an animal's gut, the more time it takes for material to pass through, and the more processing can occur. Therefore meat eating mammals typically have shorter guts than grazers. Why?
What will be an ideal response?
Meat does not contain cellulose, so it can be digested more quickly than plant material.
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Which of the following assumptions is made by scientists who apply the concept of maximum parsimony?
a. Assume that the most obvious and simple way is correct. b. Assume that unexpected relationships are caused by mutations. c. Assume that most trait changes are typically undetectable. d. Assume that evolutionary modifications are branchpoints.
If an isotope has a half-life of 4 million years and a fossil is 16 million years old, how much of the original isotope will be found in the fossil?
A) one-half of the original amount B) one-quarter of the original amount C) one-eighth of the original amount D) one-sixteenth of the original amount
Flower parts arranged in multiples of four or five is characteristic of:
A) both monocots and dicots. B) monocots. C) dicots. D) non-flowering seed plants. Refer to the scenario below, and then answer the following question(s). A friend of yours finds a plastic bag containing what appear to be similar seeds collected last year during a vacation hiking trip. Your friend isn't quite sure which plant he collected them from. You open the seed with a sharp knife, examine the inside, and ask him if it was a non-woody plant with narrow leaves. Now recalling the plant, and astonished by your "detective work," he says, "Yes! How did you know?" Your friend then presents several pressed flowers and states that one of the flowers was from the plant from which he collected the seeds, but he isn't exactly sure which one. You examine the petals and sepals of each flower. The first flower has six parts, the second has five parts, and the third has eight parts.
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