The release of an oocyte from an ovary is called ________
Fill in the blank(s) with correct word
ovulation
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Alexander Oparin hypothesized that living cells evolved from coacervates; what was the "boundary" material of the coacervates Oparin made, and how does this boundry differ from present day liposome membranes?
A. Oparin used a phospholipid bilayer to build the coacervates, it is the same as the bilayer found in present day lysosomes. B. Oparin's coacervates were surrounded by a tight skin of water molecules, the same as present day lysosomes. C. Oparin's coacervates were surrounded by carbohydrates and lipids, unlike present day lysosomes which have a carbohydrate membrane only. D. Oparin's coacervates were surrounded by a tight skin of water molecules; present day lysosomes have a phospholipid bilayer for their membrane. E. Starch was the main component in Oparin's coacervate boundry; lysosomes also use mainly carbohydrates for their membrane.
A side effect of the Army’s solution to the
contamination problem at its Aberdeen Proving Grounds is a. increased ground-water pollution. b. the depletion of most soil nutrients. c. the restoration of the soil’s normal inhabitants. d. increased air pollution. e. none of these.
Why is there free oxygen in the air?
A. Evaporation of the oceans liberated oxygen. B. It is a by-product of photosynthesis. C. Organisms need oxygen to manufacture ATP. D. Free oxygen has seeped from cracks in the earth's crust. E. Free oxygen has been present since the formation of the earth's atmosphere.
Hypothyroidism can be caused by a dietary deficiency in ____.
A. vitamin D B. multivitamins C. Penicillin D. thyroxin E. iodine