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28 Cards in this Set

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  • Back
Both DNA & RNA are __________ of nucleotides.
polymers
Only DNA is __________-__________.
double-stranded
Amino acids are the unit molecules for __________ and __________.
peptides
polypeptides
Lipids include __________ __________ (long-term, energy-storage molecules that form from glycerol and three fatty acids) and the related phospolipids, which have a charged group.
nonpolar fats
Proteins have both __________ and ensymatic functions in the human body.
structural
DNA makes up the __________, and along with RNA, control __________ __________.
genes
protein synthesis
__________ is the energy "currency" of cells because it contains high-energy phosphate bonds.
ATP(adenosine triphosphate
Each atom has an __________ __________, __________ __________, and __________ __________.
atomic symbol
atomic number
atomic weight
Number of protons is called?
atomic number
Number of protons and neutrons is called?
atomic weight
The __________ of some atoms are radioactive.
isotopes
Atoms react with one another to form _________ .
molecules
_______ react with one another to form molecules.
atoms
Following one type of reaction, positively and negatively charged ions from a molecule in whcih they are __________ bonded. Following another type of reaction, atoms sharing electrons from a molecule in which they are __________ bonded.
ionically
covalently
All matter is composed of __________, each containing just one type of __________.
elements
atom
In some covalent bonds, the electrons are shared unequally, and the result is a __________ molecule.
__________ bonding can occur between polar molecules.
polar
hydrogen
Because of hydrogen bonding, __________ heats up and cools down slowly, and this helps keep __________ __________ within normal limits.
water
body temperature
Water is a __________ molecule and acts as a solvent;it dissolves various chemical substances and facilitates __________ __________.
polar
chemical reactions
Substances like salts, acids, and bases that dissociate (that is, release ions when in water) are called __________.
electrolytes
The electrolyte balance in the blood and body tissues is important for good __________.
health
__________ have a pH that is less than 7.
Acids
__________ have a pH that is greater than 7.
Bases
The prescence of __________ helps keep the pH of body fluids constant at about neutral, or pH 7, because a buffer can absorb both __________ ions (H+) and __________ ions (OH-).
buffers
hydrogen
hydroxide
Glucose is an immediate source of __________ in cells.
energy
__________ is the unit molecule for glycogen, starch, and cellulose.
glucose
Glycogen stores __________ in the body, starch is a dietary source of __________, and cellulose is __________ in the diet.
energy
energy
fiber
Steroids are __________ with an entirely different structure from that of fats.
lipids
long-term, energy-storage molecules that form from glycerol and three fatty acids
nonpolar fats