The pitch of the voice depends on the tension of the ________

Fill in the blank(s) with correct word


vocal cords

Biology & Microbiology

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The primary pacemaker of the heart is the

(a) bicuspid valve. (b) tricuspid valve. (c) aorta. (d) sinoatrial node.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology