Copy of DNA Questions (5/28/2026) - Jason Poe | Knihovna

1

Match the DNA structure features to their descriptions.

Přetahovatelná položka		Odpovídající položka
Nucleotides		Adenine pairs with thymine
Base pairs		Twisted ladder shape of DNA
Double helix		Building blocks of DNA

1

Match the components of DNA to their roles.

Přetahovatelná položka		Odpovídající položka
Nitrogenous bases		Links nucleotides together
Sugar		Carries genetic code information
Phosphate group		Forms backbone of DNA strand

1

Match the bonds in DNA to their types.

Přetahovatelná položka		Odpovídající položka
Base stacking		Connect nucleotide base pairs
Covalent bonds		Stabilizes the double helix structure
Hydrogen bonds		Link sugar and phosphate

1

Match the scientists to their contributions to DNA.

Přetahovatelná položka		Odpovídající položka
Avery		Used X-ray diffraction
Watson and Crick		Identified DNA as genetic material
Franklin		Described DNA structure

1

Which processes occur during DNA replication?

Protein synthesis

Strand separation

RNA transcription

Base pairing

1

What role do DNA polymerases play in replication?

Breaking hydrogen bonds

Proofreading newly synthesized strands

Adding nucleotides

Initiating transcription process

1

What is the function of helicase in DNA replication?

Join amino acids together

Seal DNA fragments

Unwind DNA strands

Create replication fork

1

Why is DNA replication considered semi-conservative?

Copies DNA without errors

Preserves original DNA sequence

One old strand, one new strand

Both strands are new

**Understanding DNA Replication** DNA replication is a fundamental process that occurs in all living cells, ensuring they can divide and pass on genetic information to their offspring. This process takes place during the S phase of the cell cycle before a cell divides. The goal of DNA replication is to create two identical copies of the original DNA molecule. The process begins when the double helix structure of the DNA unwinds, facilitated by enzymes known as helicases. This unwinding creates two single strands of DNA, each serving as a template. Next, an enzyme called DNA polymerase attaches to each template strand and synthesizes a new complementary strand by adding nucleotide units. Nucleotides are the building blocks of DNA and consist of a sugar, a phosphate group, and a nitrogenous base. The bases pair specifically: adenine (A) with thymine (T) and cytosine (C) with guanine (G). As DNA polymerase continues to add nucleotides, it works in the 5' to 3' direction, ensuring that the new strands grow correctly. In the leading strand, synthesis occurs continuously as the DNA unwinds. Meanwhile, in the lagging strand, synthesis occurs in small segments called Okazaki fragments, which are later joined together by another enzyme, ligase. Ultimately, DNA replication results in two identical DNA molecules, each composed of one original strand and one newly synthesized strand, a method known as semiconservative replication. This accuracy is vital for maintaining genetic stability across generations of cells, allowing organisms to grow, repair tissues, and reproduce.

1

Which proteins are essential in DNA replication processes?

Primase
DNA polymerase
Helicase
Ligase

Enzymes

1

What stages occur during DNA replication?

Initiation
Elongation
Termination
Replication fork formation

Stages

1

Identify types of DNA strands involved in replication.

Leading strand
Okazaki fragments
Parental strand
Lagging strand

Strand Types

1

Which molecules are key components in DNA structure?

Sugar
Phosphate group
Nitrogenous base
Nucleotides

Molecules

1

What enzyme unwinds the DNA helix at the replication fork?

1

Which enzyme synthesizes new DNA strands?

1

What is produced on the lagging strand in fragments?

1

What binds to single-stranded DNA during replication?

1

What are the three main components of a nucleotide?

Nucleus, cytoplasm, membrane

Sugar, lipid, protein

Sugar, phosphate, nitrogenous base

Phosphate, amino acid, glucose

1

Which part of a nucleotide varies among different nucleotides?

Hydrogen bonds

Phosphate group

Sugar molecule

Nitrogenous base

1

What holds the complementary base pairs together in DNA?

Covalent bonds

Metallic bonds

Ionic bonds

Hydrogen bonds

1

What defines the type of nucleotide in DNA?

The sugar

The nitrogenous base

The backbone structure

The phosphate group

1

DNA strands run in opposite directions, known as antiparallelism, with one strand oriented 5' to 3' and the other 3' to 5'.

Skutečný

Falešný

1

Both DNA strands can replicate in the same direction during cellular division.

Skutečný

Falešný

1

The 5' end of a DNA strand has a phosphate group attached, while the 3' end has a hydroxyl group.

Skutečný

Falešný

1

During DNA replication, both strands are synthesized continuously without any interruptions.

Skutečný

Falešný

1

Classify the following nitrogenous bases based on their types.

Cytosine
Thymine
Guanine
Adenine

Pyrimidines
Purines

1

Identify pairs of complementary nitrogenous bases in DNA.

G-C
G-T
A-T
A-C

Complementary Pairs
Non-complementary Pairs

1

Sort the following bases by their structure type.

Cytosine
Adenine
Guanine
Thymine

Single-ring
Double-ring

1

Categorize nitrogenous bases based on whether they are DNA or RNA.

Cytosine
Uracil
Adenine
Guanine

RNA Bases
DNA Bases

1

What does Chargaff's rule state about DNA bases?

A=T and G=C

A=G and T=C

A+G=T+C

A=C and G=T

1

What enzyme unwinds the double helix during replication?

DNA polymerase

Helicase

Primase

Ligase

1

Which strand is synthesized continuously in DNA replication?

Okazaki fragments

Template strand

Leading strand

Lagging strand

1

What is produced by RNA primers during DNA replication?

Short RNA sequences

DNA fragments

Lipids

Proteins

1

What does DNA polymerase add to the growing strand?

Amino acids

Sugars

Nucleotides

Phosphates