Semen is a mixture of sperm and fluids from which accessory glands?
a. seminal vesicles and prostate gland only
b. prostate gland and bulbourethral gland only
c. seminal vesicles, prostate gland, and bulbourethral gland
d. bulbourethral gland and seminal vesicles only
c. seminal vesicles, prostate gland, and bulbourethral gland
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The long extension of a cell that can propel a cell forward by whipping back and forth (such as human sperm) is called a ________.
A. flagellum B. vesicle C. cilium D. pilus
The _____________ bacterial group contains organisms that normally inhabit the intestinal tracts of humans (depending on diet), and can additionally break down cellulose
A. Bacteroidetes B. Firmicutes C. Heliobacteria D. Gram-positive E. Proteobacteria
In humans, a gene that has been identified as causing a type of skin cancer is the
a. mutant superman. b. sonic hedgehog. c. superhero aardvark. d. superwoman echidna. e. mutant mole rat.
T cells don't function properly in patients with DiGeorge syndrome because
A) Autoantibodies attack newly synthesized T cells B) T cells can't develop properly because of a lack of thymic activity C) B cells that release growth factor are in short supply D) Stem cells in the bone marrow don't develop into T cells