Astudent builds a model of an atp molecule out of some scraps she finds at home. she uses a block
of wood for the bulk of the molecule which she labels adp. she attaches the block to a spring and then
compresses the spring between the block and a smaller round paper weight. what does the coiled spring
represent in an actual molecule of atp?
a) the covalent bond between the last phosphate and the middle phosphate
b) the adenine part
c) the covalent bond between the ribose and the first phosphate
d) the very last phosphate group
e) the ribose sugar

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

Indicate the coat color and the proportion of offspring with that color for each of the following crosses of rabbits. assume all are homozygous. albino x albino a) 1/4 chinchilla, 3/4, agouti b) 3/4 albino, 1/4 chinchilla c) all albino

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these