Which of the following is TRUE regarding lymph nodes?
A) They are located only in the digestive tract and neck.
B) They remove microorganisms and abnormal cells from the lymph and return them to blood circulation.
C) Macrophages but not lymphocytes can be found within lymph nodes.
D) They filter lymph fluid, trapping microorganisms and abnormal cells.
E) Lymph flows from the lymph vessels to the urinary system.
D
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External chemical signals that coordinate potential reproductive partners are called _____
A) hormones B) pheromones C) paracrine signals D) cytokines E) gametes
The most commonly reported STI in the United States is ________.
A. gonorrhea B. syphilis C. HIV infection D. Chlamydia infection E. genital herpes
Which organ is the target for insulin-like growth factors?
a. heart b. bone marrow c. gonads d. most body cells e. kidney
Suppose that Joe Scientist fuses a mouse cell and a human cell, and then treats the cell with specific antibodies covalently linked to fluorescent dyes (antibodies linked to mouse proteins are green; antibodies linked to human proteins are red). What will the cell look like immediately after labelling?
a. The red and green fluorescent labels will be uniformly distributed across the entire membrane of the cell. b. The cell will be half red and half green. c. The red and green labels will be distributed in the cell in intermingled patches. d. The red and green labels will flash in the cell intermittently