Biological Chemistry Questions
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By weight, which element is the second most abundant in the human body?a) oxygenb) carbonc) hydrogend) nitrogene) calcium
The shape of a folded protein is determined by A- whether the peptide bonds have α or β linkages.B- the number of peptide bonds.C- the base-pairing rules.D- the sequence of its amino acids.E- its tertiary structure.
Unsaturated fatty acids do not pack together due to the _______ in their hydrocarbon chains. A- glycosidic linkagesB- peptide bondsC- van der Waals forcesD- double bondsE- disulfide bridges
A shortage of cholesterol in the body could interfere with the formation ofa) sex hormones.b) proteins.c) cytoplasm.d) glycogen.e) nucleic acids.
Hydrogen bondsa) are responsible for some of the properties of water.b) can occur within a single large molecule.c) can form between neighboring molecules.d) are important for holding large molecules together.e) all of the above
Isotopes of an element differ in the number ofa) protons in the nucleus.b) electrons in the nucleus.c) neutrons in the nucleus.d) electron clouds.
An important buffer in body fluids isa) NaCl.b) NaOH.c) HCl.d) NaHCO3.e) H2O.
Disaccharides are:2 monosaccharide units linked with loss of water.units consisting of two fatty acids.units consisting of two polysaccharides.amino acids plus two water molecules.
Fructosea) is a hexose (6C).b) is an isomer of glucose.c) is found in fruits.d) all of the abovee) none of the above
When two monosaccharides undergo a dehydration synthesis,a) two new monosaccharides are formed.b) a disaccharide is formed.c) a polysaccharide is formed.d) a starch is formed.e) all of the above
how electrons are arranged, number of openings for electrons to exist in electron shell
Carbohydrate moleculesa) are the main building blocks of cell membranes.b) form the regulatory molecules known as enzymes.c) are the body's most readily available source of energy.d) contain the genetic information found in cells.
An amino acid is to a protein as ____________ is to a nucleic acid.a) a neutronb) a nucleotidec) a proteind) a proton
The most important metabolic fuel molecule in the body isa) glucose.b) caffeine.c) protein.d) vitamins.
The atomic number of an atom is determined by the number of ________ it has.a) electronsb) protonsc) neutronsd) protons + neutronse) protons + electrons
In chemical notation, the symbol Ca2+ means ________.a) two calcium atomsb) a calcium ion that has lost two electronsc) a calcium ion that has gained two protonsd) a calcium ion that has gained two electrons
One foot in the English system equals how many centimeters in the metric system?2.5450301.06
When electrons are transferred from one atom to another,a) a free electron is formed.b) a hydrogen bond is formed.c) an ionic bond is formed.d) a covalent bond is formed.
In dehydration synthesis reactionsa) water is a product.b) water is a reactant.c) water is converted to hydrogen and oxygen.d) hydrogen and oxygen gain electrons.
Energy is never lost, created, or destroyed, but is only changed from one form to another or transferred from one place to another. This statement is know as:a. potential energy.b. the law of conservation of energy.c. chemical equation.d. the law of oxidation and reduction.