Naive T cells can synthesize antibodies.
Indicate whether the statement is true or false
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Question 2) In the intestine, ________ ensure(s) that most digested nutrients pass through the epithelial cells and not between them.
A) ground substance
B) tight junctions
C) desmosomes
D) the plasma membrane
E) gap (communicating) junctions
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Question 3) The ________ and ________ systems control and coordinate the 50 trillion cells in a human.
A) endocrine; nervous
B) muscular; nervous
C) circulatory; endocrine
D) muscular; skeletal
E) circulatory; lymphatic
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Question 4) Male infertility (sterility) refers to ________.
A) low levels of testosterone
B) a lack of seminal fluid during ejaculation
C) the inability to fertilize an egg
D) low sperm count
E) the inability to have an erection
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Question 5) The hypophyseal portal system connects the ________ with the ________.
A) anterior pituitary; posterior pituitary
B) hypothalamus; thyroid
C) pituitary glands; thyroid
D) anterior pituitary; hypothalamus
E) posterior pituitary; hypothalamus
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Question 6) A connective tissue fiber refers to a(n) ________, a nerve fiber refers to a(n) ________, and a muscle fiber refers to a(n) ________.
A) organelle; entire cell; complex of macromolecules
B) entire cell; organelle; tissue
C) organelle; entire cell; part of a cell
D) complex of macromolecules; part of a cell; entire cell
E) complex of macromolecules; entire cell; part of a cell
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Question 7) Which of the following describes an antiport system on the basal side of renal tubule cells?
A) It exchanges K+ for Na+.
B) It transports CO2 from the blood into the tubule cells.
C) It exchanges H+ for Na+.
D) It transports bicarbonate from the tubular fluid back into the tubule cells.
E) It transports H+ in both directions across the epithelium.
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Question 8) The upper motor neurons that control skeletal muscles begin with a soma in the ________.
A) postcentral gyrus of the cerebrum
B) motor association cortex of the cerebrum
C) precentral gyrus of the cerebrum
D) posterior horn of the spinal cord
E) anterior horn of the spinal cord
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Question 9) The thymus, spleen, and tonsils are principal organs of the ________ system.
A) respiratory B) endocrine C) lymphatic D) muscular E) circulatory
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Question 10) Clonal selection of T cells happens in the thymus.
Indicate whether the statement is true or false
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