Molecular Biology: Nucleic Acids Structure [BIO 206]

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What is the main function of nucleic acids according to the text?

To form the primary, secondary and tertiary structures of DNA

To produce proteins

To act as polymers of nucleotides

To store and transfer information needed for cell function (correct)

Which of the following is NOT a type of nucleic acid mentioned in the text?

Peptide nucleic acid (PNA) (correct)

Ribonucleic acid (RNA)

Mitochondrial DNA

Deoxyribonucleic acid (DNA)

What is the Watson-Crick model related to?

The primary structure of RNA

The composition and structure of DNA (correct)

The tertiary structure of proteins

The secondary structure of DNA

What is the purpose of describing the primary, secondary and tertiary structure of DNA?

To understand the genetic information stored in DNA Signup and view all the answers

Which type of DNA supercoiling is mentioned in the text?

No specific types of DNA supercoiling are mentioned Signup and view all the answers

What is the purpose of studying molecular biology according to the text?

To understand biological phenomena at the molecular level Signup and view all the answers

What is the orientation of the two DNA strands?

Antiparallel Signup and view all the answers

What type of bonds hold the complementary base pairs together?

Hydrogen bonds Signup and view all the answers

How many hydrogen bonds are present between adenine and thymine?

2 Signup and view all the answers

Which of the following statements about the DNA sequence is correct?

The sequence of one strand determines the sequence of the second strand. Signup and view all the answers

What is the role of base stacking in the stability of the DNA double helix?

It balances the repulsive forces of phosphate groups. Signup and view all the answers

What is the function of DNA replication in relation to the complementary base pairing?

DNA replication creates two complementary DNA strands. Signup and view all the answers

How many base pairs or steps are there for each complete turn of the DNA helix?

10.4 Signup and view all the answers

What is the width of the B-form of DNA?

2 nm Signup and view all the answers

Which form of DNA has major and minor grooves with widths of 2.2 nm and 1.2 nm respectively?

A form Signup and view all the answers

What is a special characteristic of Z form DNA?

It consists primarily of alternating cytosine and guanine bases (CGCGCG) Signup and view all the answers

Which structural form of DNA is described as thicker and shorter than the B form?

A form Signup and view all the answers

Where is the A form of DNA found?

In moderately dehydrated chromatin Signup and view all the answers

What is the typical length of Z-DNA stretches found at the 5' ends of genes?

12-24 base pairs Signup and view all the answers

What is the primary function of DNA supercoiling?

To enable the packing of large DNA molecules into cells Signup and view all the answers

Which type of supercoiling is more commonly present under normal physiological conditions?

Negative supercoiling Signup and view all the answers

Which type of supercoiling is associated with the winding of DNA around histones?

Left-handed supercoiling Signup and view all the answers

What is the main advantage of having DNA in a negatively supercoiled form?

It makes unwinding of DNA easier Signup and view all the answers

What is the structure of the DNA molecule in a typical prokaryotic organism?

Circular, double-stranded, and supercoiled Signup and view all the answers

What are the four main nucleotides that form the primary structure of DNA?

dAMP, dGMP, dCMP, dTMP Signup and view all the answers

How are the nucleotides linked together in a DNA strand?

By phosphodiester bonds between the 5'-hydroxyl and 3'-hydroxyl groups Signup and view all the answers

Molecular Biology: Nucleic Acids Structure [BIO 206]

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