Molecular Biology (1) - Lecture 4: Cell Cycle and Cell Division

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Which phase of the cell division cycle is specifically responsible for DNA replication in most eukaryotic cells?

G2 phase

M phase

S phase (correct)

G1 phase

What is the term used to describe the process where one double-stranded DNA molecule produces two identical copies?

Non-conservative replication

Conservative replication

Dispersive replication

Semiconservative replication (correct)

What is the term used for the structures into which DNA molecules are packaged during cell division?

Chromatids (correct)

Nucleosomes

Histones

Centromeres

Which type of genome usually consists of a number of DNA molecules?

Eukaryotic genome Signup and view all the answers

What serves as a template for the production of the complementary strand during DNA replication?

Parental DNA molecules Signup and view all the answers

Which enzyme is responsible for matching the existing DNA bases with complementary nucleotides and linking them together to make the new strand?

DNA polymerase Signup and view all the answers

What is the role of helicases in DNA replication?

Separating the two parental strands at the replication forks Signup and view all the answers

What is the function of topoisomerases in DNA replication?

Preventing the DNA double helix from getting too tightly wound Signup and view all the answers

What is the primary role of primase in DNA replication?

Generating RNA primers for DNA synthesis Signup and view all the answers

Where does the replication of a DNA molecule begin?

At the origin of replication Signup and view all the answers

What is the role of single-strand binding proteins in DNA replication?

Stabilizing unpaired DNA strands Signup and view all the answers

What is the significance of A:T pairs dominating in a sequence of replication origin?

They are easier to separate than C:G pairs Signup and view all the answers

Why is it important for the enzymes to prevent the DNA double helix ahead of the replication fork from getting too tightly wound?

To allow the replication machinery to proceed ahead Signup and view all the answers

What is the shape of a region where the parental strands of DNA are being unwound during DNA replication?

"Y"-shaped region Signup and view all the answers

What type of chromosome does E. coli have and how many origins of replication does it have?

Circular with a single origin of replication Signup and view all the answers

Molecular Biology (1) - Lecture 4: Cell Cycle and Cell Division

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