Biological Chemistry Questions

the h20 molecules in ice are in a much more orderly arrangement than in the liquid state water molecules are packed into a less dense formationthe rate of hydrogen bond breakage slows

when the data from the control and experimental groups are NOT statistically different from one another

theoretical explanationobservationexperimental investigation

The mass of an atom is largely determined by the number of ________ it has.a) electronsb) protonsc) neutronsd )protons + neutronse) protons + electrons

Molecules that store and process genetic information are thea) proteins.b) nucleic acids.c) carbohydrates.d) lipids.

When atoms complete their outer electron shell by sharing electrons, they forma) ionic bonds.b) covalent bonds.c) hydrogen bonds.d) anions.e) cations.

The molecule O2 is known asa) oxide.b) oxygen.c) organic.d) semi-water

Chemical reactions that yield energy, such as heat, are said to bea) endergonic.b) activated.c) exergonic.d) neutral.

An example of an organic substance isa) sucrose.b) water.c) sodium chloride.d) oxygen.e) carbon dioxide.

A solution containing equal numbers of hydrogen ions and hydroxide ions isa) acidic.b) basic.c) neutral.d) alkaline.

Which has the greater concentration of hydrogen ions - a substance with a pH of 5 or a substance with a pH of 4?a) pH of 4b) pH of 5c) they are both equal; 4 and 5 are relative values.d) neither, pH has nothing to do with hydrogen ion concentration.

According to the rules of complementary base pairing in nucleic acids, cytosine would pair with the basea) thymine.b) adenine.c) uracil.d) cytosine.e) guanine.

When the pH of the blood is between 7.45 and 7.80, the patient shows signs of:normal health.acidosis.alkalosis.death.

Molecules that have the same molecular formula but different structural formulas are calleda) isotopes.b) isomers.c) isozymes.d) isotypes.

All of the following are true concerning enzymes, except that theya) are proteins.b) function as biological catalysts.c) lower the activation energy required for a reaction.d) are consumed during the reaction.

The reaction N2 + 3 H2 → 2 NH3 is an example of a(n)a) exchange reaction.b) decomposition reaction.c) synthesis reaction.d) enzyme reaction.

If an element is composed of atoms with an atomic number of 6 and a mass number of 14, then the nucleus of a neutral atom of this element containsa) 6 protons.b) 8 electrons.c) 6 protons and 8 neutrons.d) 6 protons and 8 electrons.

Of the list below, which has the highest concentration of hydrogen ions?a) pH 1b) pH 14c) pH 7d) pH 10e) pH 2

A dust particle floating on a water surface illustratesa) surface tension.b) chemical tension.c) static electricity.d) heat capacity.

A molecule with a long hydrocarbon chain and a carboxyl group at the end is a(an):amino acid.fatty acid.alcohol.polysaccharide.