The pitch of the voice depends on the tension of the ________
Fill in the blank(s) with correct word
vocal cords
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The primary pacemaker of the heart is the
(a) bicuspid valve. (b) tricuspid valve. (c) aorta. (d) sinoatrial node.
John Bernal suggested that prebiotic synthesis of polymers took place on clay because
A. Clay minerals are known to bind organic molecules. B. Clay is negatively charged and attracts cations. C. Some minerals in clay attract organic monomers and catalyze chemical reactions. D. Clay minerals can attract and bind organic molecules, catalyze chemical reactions and attract cations. E. Clay is positively charged and can bind organic molecules for polymerization.
Which plant cell structure is comprised of approximately 300 chlorophyll molecules and about 40 carotenoid
pigments, organized together to optimize the capture of light energy?
a. reaction center b. chlorophyll c. antenna complex d. cytochrome complex e. stomata
Answer the question using the accompanying figure. The structure labeled “B” forms at the ____
a. junctions of A bands and I bands b. H zone c. junctions of A bands and H zones d. M line e. junctions of I bands and M lines