Quiz 1- The Chemistry of Life

____, H, O, N make up 96% of living matter.

• F

• Na

• P

• C

A(n) _____________ bond occurs when electrons are shared by two atoms.

• hydrogen

• covalent

• ionic

• nuclear

Which of the following molecules would contain a polar covalent bond?

• Cl₂

• NaCl

• H₂O

• CH₄

Because of the unique properties of water associated with hydrogen bonding, water evaporates from pores on the leaves of plants and draws up water molecules in a continuous chain from the roots up through the vascular tissues of plants. Which of these groups of terms describes the process and properties of water that explain this?

• adhesion, cohesion, and translocation

• adhesion, cohesion, and transcription

• cohesion, hybridization, and transpiration

• cohesion, adhesion, and transpiration

Hydrolysis is involved in which of the following?

• formation of starch, a polysaccharide, from monomers of glucose

• hydrogen bond formation between nitrogen bases of nucleic acids

• peptide bond formation between amino acids to form a protein

• the digestion of sucrose, a disaccharide to its monomers of glucose and fructose

An organic compound that is composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio is known as a

• lipid

• carbohydrate

• protein

• nucleic acid

Which of the macromolecules below could form structural parts of the cell, be enzymes, or be involved in cell movement or communication?

• nucleic acids

• proteins

• lipids

• carbohydrates

The partial negative charge at one end of a water molecule is attracted to a partial positive charge of another water molecule. What is this type of attraction called?

• a polar covalent bond

• an ionic bond

• a hydration shell

• a hydrogen bond

If the pH of a solution is decreased from 7 to 6, it means that the concentration of

• H⁺ has decreased to 1/10 of what it was at pH 7.

• H⁺ has increased to 10 times what it was at pH at 7.

• OH^- has increased to 10 times what it was at pH 7.

• OH^- has increased to 1/7 of what it was.

Which of the following statements regarding carbon is false?

• Carbon has the capacity to form polar covalent bonds with hydrogen.

• Carbon has the ability to form covalent bonds with up to four other atoms.

• Carbon has the capacity to form single and double bonds.

• Carbon has the ability to bond together to form extensive branched or unbranched "carbon skeletons".