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

Biology & Microbiology

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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.

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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

Biology & Microbiology

Which of the following is dense connective

tissue that joins two bones? a. sutures b. ligaments c. muscles d. tendons e. fascia

Biology & Microbiology

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

Biology & Microbiology