The embryonic heart
A. develops from two endothelial tubes that fuse together.
B. has two atria but only one ventricle.
C. has no passages connecting right side to left side.
D. doesn't beat until just prior to birth.
E. consists of four chambers.
Answer: A
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This figure shows an intestinal villus. The structure indicated by number 3 is a
A. submucosal gland. B. Brunner gland. C. lymphatic nodule. D. plicae circulares. E. mucous gland.
________ proteins extend all the way across the cell membrane.
Fill in the blank(s) with the appropriate word(s).
The gestation length for a dog is __________ days
a. 30 c. 72 b. 63 d. 96
Carbohydrate molecules
A) are the building blocks of cellular membranes. B) form the regulatory molecules known as enzymes. C) are the body's most readily available source of energy. D) are composed of C, H, O, and N atoms. E) contain the genetic information found in cells.