Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?
A) hormonal signaling
B) autocrine signaling
C) paracrine signaling
D) endocrine signaling
E) synaptic signaling
Ans: C) paracrine signaling
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Bacteriophages can be used as vectors in recombinant DNA experiments because they
A) are small and made of double-stranded DNA. B) are circular and easily imported into bacteria or yeast. C) insert their genetic material into bacteria. D) are resistant to protective restriction systems.
Cholesterol ____
a. has a rigid backbone of four nitrogen rings b. is the most common steroid in animal tissue c. is a lipid with a fatty-acid component d. is needed to inhibit sexual development and maturity e. is needed to lubricate feathers
Which of the following is dense connective
tissue that joins two bones? a. sutures b. ligaments c. muscles d. tendons e. fascia
Which of the following defense cells are able to squeeze through the intact walls of capillaries into the tissues to attack and ingest invading microbes?
A) B cells B) Lymphocytes C) Phagocytes D) Mast cells E) Natural killer cells