Bio Chapter 5

If one strand of a DNA molecule has the sequence of bases 5'ATTGCA3', the other complementary strand would have the sequence

3'TAACGT5'

If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?

40

Which bond is closest to the N-terminus if the molecule?

A

Which of the following statements is true regarding the molecule illustrated in Figure 5.2?

A and B only

What is a triacylglycerol?

A lipid made with three fatty acids and glycerol

Which of the following descriptions best fits the class of molecules known as nucleotides?

A nitrogenous base, a phosphate group, and a pentose sugar

Polysacharides, lipids, and proteins are similar in that they

Are synthesized from monomers by dehydration reaction

At which bond would water need to be added to achieve hydrolysis of the peptide, back to its component amino acid?

C

What bond is a peptide bond?

C

The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?

C60H100O50

What is the term used for a protein molecule that assists in the proper folding of other proteins?

Chaperonin

Which of the following are nitrogenous bases of the pyrimidine type?

Cytosine and uracil

Which of the following best describes the flow of information in eukaryotic cells?

DNA --> RNA --> proteins

What is the chemical mechanism by which cells make polymers from monomers?

Dehydration reactions

There are 20 different amino acids. What makes one amino acid different from another?

Different side chains (R groups) attached to an alpha (a) carbon

Which bond is closest ti the corboxyl end of the molecule?

E

A molecule with the formula C18H36O2 is probably a

Fatty acid

Which of the following is not a polymer?

Glucose

Which of the following are nitrogenous bases of the purine type?

Guanine and adenine

Which type of interaction stabilizes the alpha (a) helix and the beta (b) pleated sheet structures of proteins?

Hydrogen bond

Which of the following statements is/are true regarding the chemical reaction illustrated in Figure 5.5?

It results in a peptide bond

If 2 molecules of the general type shown in Figure 5.1 were linked together, carbon 1 of one molecule to carbon 4 of the other, the single molecule that would result would be

Maltose

Which of the following statements is true regarding the molecule illustrated in Figure 5.3?

Molecules of this type are usually lipid at room temperature

The bonding of two amino acid molecules to form a larger molecule requires which of the following?

Removal of a water molecule

The a helix and the B pleated sheet are both common polypeptide forms found in which level of protein structure?

Secondary

What is the structure shown in Figure 5.4?

Steroid molecule

The molecule shown in Figure 5.3 is a

Unsaturated fatty acid