Which of the following is not a reason the skin is a useful barrier?
A) The skin is enriched with antimicrobial peptides.
B) The skin is enriched with lipids to serve as a water-resistant layer.
C) The skin produces mucus to trap microbes.
D) The outermost layer is made up of tightly compacted dead epithelial cells.
E) The skin is enriched with specialized proteins such as keratin.
Answer: C
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The part of the top soil that is characterized by its spongy organic matter that is chemically complex and hard to break down is
A. topsoil. B. creosote. C. humus. D. clay. E. silt.
What possible dietary complications could a person develop if they had their pancreas removed?
A. There would be an overproduction of the enzyme trypsin. This would cause an increased rate of protein digestion that could result in the muscle cells being destroyed by the individuals own body. B. They would not produce the pancreatic enzyme trypsin. This would prevent them from breaking down carbohydrates into glucose which could lead to a decrease in the availability of energy in their body. C. They would not produce the enzyme pancreatic amylase. This would prevent them from breaking down proteins into amino acids which could lead to complications in repairing muscle tissue. D. They would not produce the pancreatic enzyme trypsin. This would prevent them from breaking down proteins into amino acids which could lead to complications in repairing muscle tissue.
Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal?
A) Voltage-gated calcium channels in the membrane open. B) Synaptic vesicles fuse with the membrane. C) The postsynaptic cell produces an action potential. D) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.
Which of the following are never sink regions for the
pressure-flow translocation of organic compounds? a. growing leaves b. seeds c. fruits d. roots e. mature photosynthesizing leaves