In mammals, embryonic cells form an inner cell mass that will become the body of the embryo and a layer of surrounding cells that will become the chorionic membrane and placenta. What are these surrounding cells called?
A. blastocoel
B. yolk
C. blastodisc
D. trophoblast
D. trophoblast
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Which of the following is a difference between frogs and salamanders?
a. frogs have cloacas; salamanders do not b. salamander larvae are tetrapods; frog larvae are not c. salamanders have scales; frogs do not d. frogs reproduce in water; salamanders only sometimes reproduce in water e. more than one of these is a difference between frogs and salamanders
Once an RNA molecule has been made from DNA, it enters the cytoplasm of the cell where it is used by the cell to produce a
A) fat. B) cell membrane. C) carbohydrate. D) nucleus. E) protein.
An estimation of the area of the Earth's surface a human requires to produce the resources he or she needs and to remove the wastes he or she produces is called a(n) ________
Fill in the blank(s) with correct word
Enzymes that are regularly found in a cell are termed:
A. exoenzymes. B. endoenzymes. C. constitutive enzymes. D. induced enzymes. E. conjugated enzymes.