In which part of a chloroplast does photosynthesis occur?
a. stroma
b. outermost membrane
c. innermost membrane
d. between the two outer membranes
e. ribosomes
ANSWER: c
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The process by which new species originate
A. is extinction. B. occurred for millions of years but is no longer occurring. C. is speciation. D. is germination. E. occurred only once in Earth's history.
Autoimmune hepatitis attacks _____.
Fill in the blank(s) with the appropriate word(s).
During the process of ________, aquatic species release large numbers of gametes into the water
Fill in the blank(s) with correct word
Which of the following statements about membrane-enclosed organelles is true?
(a) In a typical cell, the area of the endoplasmic reticulum membrane far exceeds the area of plasma membrane. (b) The nucleus is the only organelle that is surrounded by a double membrane. (c) Other than the nucleus, most organelles are small and thus, in a typical cell, only about 10% of a cell's volume is occupied by membrane-enclosed organelles; the other 90% of the cell volume is the cytosol. (d) The nucleus is the only organelle that contains DNA.