Exam 2: The Chemistry of Life

A proton has ________ charge.

Marinades that contain vinegar,wine,or yogurt are able to tenderize meat by breaking down collagen into smaller polypeptides because of their ________.

Proteins provide most of the energy for life processes.

All the isotopes of a particular element have the same number of protons.

An atom is in its most stable state when all its electron shells are filled to capacity.

Individual water molecules orient toward each other because of the ________ bonds that form between them.

The most abundant protein found in animals is actinomyosin.

We use soap to clean ourselves better than we could with water alone.Soaps contain phospholipids that are responsible for the cleansing action.Which of the following statements is the most likely explanation for how soaps work?

Which of the following is NOT a method used to tenderize meat?

The smallest unit of a chemical element that displays the properties of that element is a(n)

The primary structure of a protein consists of its amino acid sequence.

A scientist observed a chemical that changes to bright red in the presence of organic compounds containing nitrogen and phosphorus.To test this chemical,a set of test tubes is prepared,with each tube containing a purified sample of one of the following organic compounds.The chemical is then added to each tube.The test tube containing ________ will always turn bright red.

An atom that becomes charged due to the gain or loss of an electron is called a(n)________.

After adding a small amount of Solution A to Solution B,the pH of Solution B declines from 8 to 3.Solution A must contain

The outer electron shell of a nitrogen atom can hold up to eight electrons but contains only five.As a result,nitrogen can form ________ covalent bonds.

When phospholipids are added to water,they arrange themselves so that

The following figure shows the structural and space-filling models for stearic acid and oleic acid. Although the two fatty acids have the same number of carbon atoms,they have different three-dimensional configurations; oleic acid has a slight bend near the middle.The result is that

Examine the following illustration,a representation of a sodium ion with a charge of +1.Based on the information provided,determine the proton number for this atom.

The monomers that are linked together to form a DNA polymer are called ________.

Referencing the image below,________ water molecules would be required for hydrolysis to completely separate the 6-monomer polymer into individual monomers.