Biology Test Questions

Topics: Action potential, Neuron, Neurotransmitter Pages: 5 (951 words) Published: September 25, 2013
Test 3
Chapter 51: 1, 2, 5, 7
1. Most of the metabolic energy needed by a bird for a long-distance migratory flight is stored as a. glycogen.
b. fat.
c. protein.
d. carbohydrates.
e. ATP.

2. Which statement about essential amino acids is true?
a. They are not found in vegetarian diets.
b. They are stored by the body until they are needed.
c. Without them, one is undernourished.
d. All animals require the same ones.
e. Humans can acquire all of theirs by eating milk, eggs, and meat.

3. Which statement about nutrient absorption by the intestinal mucosal cells is true? a. Carbohydrates are absorbed as disaccharides.
b. Fats are absorbed as fatty acids and monoglycerides.
c. Amino acids move across the plasma membrane only by diffusion. d. Bile transports fats across the plasma membrane.
e. Most nutrients are absorbed in the duodenum.

4. Microbial fermentation in the gut of a cow
a. produces fatty acids as a major nutrient for the cow.
b. occurs in specialized regions of the small intestine.
c. occurs in the cecum, from which food is regurgitated.
d. produces methane as a major nutrient.
e. is possible because the stomach wall does not secrete hydrochloric acid. Chapter 41:  2, 4, 5, 7, 9, 10
1. Both epinephrine and cortisol are secreted in response to stress. Which of the following statements is also true for both of these hormones? a. They act to increase blood glucose availability.
b. Their receptors are on the surfaces of target cells.
c. They are secreted by the adrenal cortex.
d. Their secretion is stimulated by corticotropin.
e. They are secreted into the blood within seconds of the onset of stress.

2. PTH
a. stimulates osteoblasts to lay down new bone.
b. reduces blood calcium levels.
c. stimulates calcitonin release.
d. is produced by the thyroid gland.
e. is released when blood calcium levels fall.

3. Steroid hormones
a. are produced only by the adrenal cortex.
b. have only cell surface receptors.
c. are water-soluble.
d. act by altering the activity of proteins in the target cell. e. act by altering gene expression in the target cell.

4. The posterior pituitary
a. synthesizes oxytocin.
b. is under the control of hypothalamic releasing neurohormones. c. secretes tropic hormones.
d. secretes neurohormones.
e. is under feedback control by thyroxine.

5. Which of the following is a likely cause of diabetes?
a. Overproduction of insulin by β cells of the pancreas
b. Loss of α cells of the pancreas
c. Loss of insulin receptors
d. Overproduction of glucagon
e. Loss of receptors for somatostatin

6. Which statement is true of all hormones?
a. They are secreted by glands.
b. They have receptors on cell surfaces.
c. They may stimulate different responses in different cells. d. There is a gene that codes for each hormone.
e. When the same hormone occurs in different species, it has the same action. Chapter 45: 1, 3, 4, 5, 7, 9
1. The rising phase of an action potential is due to the
a. closing of K+ channels
b. opening of chemically gated Na+ channels.
c. closing of voltage-gated Na+ channels.
d. opening of voltage-gated Na+ channels.
e. spread of positive current along the plasma membrane.

2. Which statement about synaptic transmission is not true?
a. The synapses between neurons and skeletal muscle cells use ACh as their neurotransmitter. b. A single vesicle of neurotransmitter can cause a muscle cell to contract. c. The release of neurotransmitter at the neuromuscular junction causes the motor end plate to depolarize. d. In vertebrates, the synapses between motor neurons and muscle fibers are always excitatory. e. Inhibitory synapses cause the resting potential of the postsynaptic membrane to become more negative.

3. Which statement accurately describes an action potential? a. Its magnitude increases along the axon.
b. Its magnitude decreases along the axon.
c. All action potentials ina single neuron are of the...
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