What are the two components of the human placenta?
A. chorionic frondosum and chorionic villus
B. chorionic frondosum and decidua basalis
C. decidua basalis and chorionic villus
D. chorionic villus and endometrium
E. chorionic frondosum and amnion
B. chorionic frondosum and decidua basalis
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At one point in human development, tissue connects the fingers and the hand, giving the hand a
“webbed” appearance. Enzymes eventually destroy the cells of the webbing and the fingers separate. These enzymes are probably liberated from the
a. chormosomes. b. smooth endoplasmic reticulum. c. lysosomes. d. nucleus. e. vacuoles.
A parent has a genotype of RrYy. What is the probability of having a gamete with the RY genotype?
a. 1/2 b. 1/4 c. 3/4 d. 1/8 e. 0
The systematic approach to exploring the natural world is known as the ____________________. Fill in the blank(s) with the appropriate word(s)
Which of the following is NOT a characteristic of pUC19's usefulness as a cloning vector?
a. ampicillin resistance for selection b. easily screenable insertion c. large size d. multiple cloning site