Which of the following statements about the basic structural features of DNA are true

Which of the following clusters of terms accurately describes DNA as it is generally viewed to exist in prokaryotes and eukaryotes?

double-stranded, parallel, (A + T)/C + G) = 1.0, (A + G)/(C + T) = 1.0
double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C+ T) = 1.0
double-stranded, parallel, (A + T)/C + G) = variable, (A + G)/(C + T) = 1.0
double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C + T) = variable
single-stranded, antiparallel, (A + T)/C + G) = 1.0, (A + G)/(C + T) = 1.0

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which of the following statements about the basic structural features of dna are true?

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(321k points)

Which of the following statements about the basic structural features of DNA are true?

Select all true statements.

The twisting of the DNA double helix is attributed to the tight packing of DNA bases and base-stacking.

The major and minor grooves form in the DNA helix because the DNA strands are antiparallel.

In a DNA macromolecule, the two strands are complementary and antiparallel.

The major and minor grooves prevent DNA binding proteins from making contact with nucleotides.

1 Answer

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(321k points)

The twisting of the DNA double helix is attributed to the tight packing of DNA bases and base-stacking.

In a DNA macromolecule, the two strands are complementary and antiparallel.

Related questions

Answer the following questions and then press 'Submit' to get your score.

Question 1

The structure of DNA is closely related to its biological function. Which of the following statements regarding the structure of DNA is correct?

a) All base pairs interact by forming three hydrogen bonds.

b) DNA is comprised of nucleotide subunits each containing a base, a ribose sugar and a phosphate group.

c) The double helix of DNA is stabilized by interactions between adjacent ribose sugars.

d) Each DNA sequence folds into a unique and complex three-dimensional structure.

Question 2

Which of the following statements concerning RNA is correct?

a) A double helix is the predominant three-dimensional structure of most forms of RNA.

b) tRNA transfers the base sequence of DNA to the ribosome.

c) mRNA translates the base sequence of DNA for use in protein synthesis.

d) Hydrogen bonding within the same strand of RNA is necessary to maintain its three dimensional structure.

Question 3

DNA is an important therapeutic target for the intercalating agent class of drugs. These drugs work by:

a) Occupying the space between base pairs forming a stable complex.

b) Forming hydrogen bonds with active site amino acid residues.

c) Promoting the unwinding of the DNA double helix.

d) Preventing the formation of base pairs.

Question 4

Which of the following factors is most likely to influence how a protein folds into its native conformation?

a) The establishment of bonding interactions with other parts of the peptide backbone.

b) The rotation of the peptide bond.

c) The formation of the maximum possible number of beta-sheets in the final folded structure.

d) The formation of the maximum number of cis-peptide bonds in the peptide backbone.

Question 5

Consider a protein with the sequence Lys-Ser-Gly-Ala-Ala-Glu-Tyr-Pro-Thr-Val-Phe. Which of the following statements is correct?

a) This protein could be classified as a decapeptide.

b) This protein could also be represented by the abbreviation KSGAAEYPTVF.

c) This protein is mostly comprised of amino acids with polar side chains.

d) This is an example of a quaternary protein.

Question 6

Which of the following statements best describes the role of proteins as therapeutic targets?

a) Very few drugs exert their effects by interacting with proteins.

b) Drugs targeting enzymes usually activate their target protein.

c) Drugs often work by enhancing the binding of an enzyme's substrate.

d) Drugs targeting proteins are often very specific and can be less likely to produce side effects.

Question 7

Which of the following statements, concerning the structure and chemistry of carbohydrates, is correct?

a) Monosaccharides always contain six carbon atoms.

b) Hexoses are more likely to exist in their open-chain forms.

c) Glycosidic bonds between two monosaccharides always join two anomeric carbons.

d) Hexose sugars can form five-membered rings.

Question 8

Which of the following statements, regarding some common carbohydrates, is correct?

a) Ribose is a pentose sugar.

b) Sucrose is a disaccharide of galactose and glucose.

c) D-Glyceraldehyde rotates plane polarised light in the anti-clockwise direction.

d) Glucose can be classified as an oligosaccharide.

Question 9

Which of the following statements concerning the structure and properties of lipids is correct?

a) Dietary fats are comprised of three fatty acids bonded to a molecule of glycerol by ether linkages.

b) Acetic acid is a typical medium chain fatty acid.

c) Naturally occurring unsaturated fatty acids generally form less effective non-polar interactions with each other.

d) Phospholipids are highly polar molecules.

Question 10

Steroids usually share which common structural feature?

a) Methyl groups at position 8 and 9.

b) A hydrocarbon functional group at position 17.

c) A nitrogen containing functional group at position 3.

d) Four fused six-membered rings.