Which of the following statements is correct regarding the human digestive tract?
a. The large intestine contains villi and is smaller in diameter and shorter in length than the
small intestine.
b. The large intestine contains villi and is smaller in diameter and longer in length than the
small intestine.
c. The large intestine does not contain villi and is smaller in diameter and longer in length
than the small intestine.
d. The large intestine does not contain villi and is larger in diameter and smaller in length
than the small intestine.
e. The large intestine does not contain villi and is larger in diameter and longer in length than
the small intestine.
D
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Bacterial flagella ____
a. are smaller and simpler than eukaryotic flagella b. consist of a straight fiber of protein c. are found in all motile bacteria d. are powered by a gradient of calcium ions e. contain microtubules
The function of the phloem companion cells is to
a. assist vessel members to move organic substances. b. supply potassium ions for water absorption. c. help load organic compounds into neighboring sieve tubes. d. store the organic compounds transported by the sieve tubes. e. help transport organic compounds when the sieve tubes become overloaded.
The eye is a warm, moist environment favored by many harmful bacteria. Nevertheless, eye infections are relatively rare. Why is this?
A) The enzyme tearase inhibits bacterial growth. B) Tears contain the antibacterial enzyme lysozyme. C) The eyes are constantly exposed to UV light, which inhibits bacterial growth. D) Antibodies, particularly IgM, are secreted in abundance in the tears.
What is a relationship called between two types of organisms in which one benefits while the other remains unaffected?
A. Amensalism B. Commensalism C. Mutualism D. Parasitism