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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Enzymes that are regularly found in a cell are termed:

A. exoenzymes. B. endoenzymes. C. constitutive enzymes. D. induced enzymes. E. conjugated enzymes.

Biology & Microbiology