Carbon dioxide is the source of the electron that replace those lost by chloroplyll a in the photosystems

a. true
b. false


Answer: b. false

Biology & Microbiology

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Blood vessels that connect networks of capillary beds are

(a) arteries. (b) veins. (c) portal veins. (d) both b and c.

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A gene on the Y chromosome that determines maleness is

A) ABO. B) XIST. C) SRY. D) E. BOY.

Biology & Microbiology

Name and describe several hormones that affect digestion in the gastrointestinal tract

What will be an ideal response?

Biology & Microbiology

Cells with gap junctions are typical of tissues

a. that suffer wear, abrasion, and mechanical insults. b. such as bone and cartilage that must withstand external forces. c. that require rapid exchange of chemical messages, as is the case for cardiac muscle. d. that secrete enzymes or hormones. e. described by all of these.

Biology & Microbiology