Mastering the Central Dogma of Biology

What is the basic structure of DNA?

• A linear chain of sugars.

• The basic structure of DNA is a double helix made of two strands of nucleotides.

• A single strand of amino acids.

• A triple helix made of proteins.

Describe the role of nucleotides in DNA structure.

• Nucleotides are proteins that help in DNA replication.

• Nucleotides are the primary energy source for cellular functions.

• Nucleotides are only involved in RNA structure, not DNA.

• Nucleotides form the backbone of DNA and encode genetic information through their sequence.

What enzyme is responsible for synthesizing RNA during transcription?

• Helicase

• DNA polymerase

• RNA polymerase

• Ribonuclease

Explain the process of transcription in eukaryotic cells.

• Transcription occurs only in prokaryotic cells.

• Transcription involves the replication of DNA into RNA.

• Transcription is the process of translating RNA into proteins.

• Transcription in eukaryotic cells is the process of synthesizing RNA from a DNA template, involving initiation, elongation, termination, and processing of pre-mRNA.

What are the main differences between prokaryotic and eukaryotic transcription?

• Prokaryotic transcription occurs in the nucleus and involves multiple RNA polymerases.

• Eukaryotic transcription is simpler and occurs in the cytoplasm with one RNA polymerase.

• Both prokaryotic and eukaryotic transcription involve the same RNA polymerase and occur in the same location.

• Prokaryotic transcription is simpler, occurs in the cytoplasm, and involves one RNA polymerase; eukaryotic transcription is more complex, occurs in the nucleus, and involves multiple RNA polymerases with mRNA processing.

What modifications occur during RNA processing?

• Transcription and translation

• DNA replication

• Protein folding

• 5' capping, polyadenylation, and splicing

What is the significance of the 5' cap and poly-A tail in mRNA?

• The 5' cap is involved in DNA replication.

• The poly-A tail is responsible for mRNA splicing.

• The 5' cap and poly-A tail are only for mRNA stability.

• The 5' cap and poly-A tail protect mRNA, enhance translation, and facilitate nuclear export.

Describe the process of translation in protein synthesis.

• Translation is the process of synthesizing proteins from mRNA using ribosomes, involving initiation, elongation, and termination.

• Translation only happens during cell division.

• Ribosomes are not involved in the translation process.

• Translation occurs in the nucleus of the cell.

What are the roles of ribosomes in translation?

• Ribosomes break down proteins into amino acids.

• Ribosomes store genetic information for protein synthesis.

• Ribosomes transport nutrients to the cell nucleus.

• Ribosomes synthesize proteins by translating mRNA into polypeptides.

How do tRNA molecules function in the translation process?

• tRNA molecules synthesize mRNA during translation.

• tRNA molecules are responsible for unwinding the DNA during translation.

• tRNA molecules transport amino acids to the ribosome and match them to the mRNA codons during translation.

• tRNA molecules act as enzymes to catalyze peptide bonds.