Plant cells are often green but animal cells are not usually green. Which structure in plant cells makes them green?
a) cell wall
b) chloroplast
c) cytoplasm
d) vacuole
Answer: b) chloroplast
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Protein disulfide isomerase:
A. reduces disulfide bonds. B. facilitates posttranslational modification of a protein. C. catalyzes the breakage and formation of disulfide bonds. D. reduces disulfide bonds and facilitates posttranslational modification of a protein. E. reduces disulfide bonds, facilitates posttranslational modification of a protein, and catalyzes the breakage and formation of disulfide bonds.
Symbiotic chemosynthetic bacteria obtain oxygen from their hosts through:
a. hemoglobin. b. myoglobin. c. sulfide-binding proteins. d. luciferin. e. breaking down cellulose.
Which of the following choices represents the
correct sequence? a. microspores >>> meiosis >>> gametophyte >>> sperm b. meiosis >>> microspores >>> gametophyte >>> sperm c. gametophyte >>> meiosis >>> megaspores >>> eggs d. meiosis >>> gametophyte >>> megaspores >>> eggs e. gametophyte >>> mitosis >>> megaspores >>> eggs
The hormone ________, produced by the pineal gland, may be involved in sleep-wake cycles in humans
Fill in the blank(s) with correct word