NEET Biology Genetics : Multiple Choice Previous Years Questions MCQs 11

TL;DR

This video provides an overview of DNA replication, gene expression, and key concepts in genetics.

Transcript

hello friends this video on need genetics is brought to you by a brand co.com no more fear from exam question number 14 DNA replication is conservative and discontinuous daily conservative and semi discontinuous semi conservative and discontinuous conservative so by now all of us know that DNA replication the process of DNA replication is semiconse... Read More

Key Insights

• 🧬 DNA replication is a semiconservative and semidiscontinuous process.
• 👨‍💻 Sisterons and genes are synonymous terms, both referring to specific sections of DNA that code for proteins.
• 🥳 The ratio of adenine to thymine and guanine to cytosine remains constant in a given species.
• 🔂 The one gene, one enzyme hypothesis suggests that each gene produces a single enzyme involved in metabolism.
• 😑 The Lac Operon regulates gene expression for lactose fermentation.
• ❓ Removal of RNA polymerase 3 affects the synthesis of tRNAs and rRNAs.
• ❓ Beadle and Tatum proposed the one gene, one enzyme hypothesis.

Questions & Answers

Q: How does DNA replication occur?

DNA replication is a semi-conservative process where one strand of DNA serves as a template for the synthesis of a new complementary strand. It is semi-discontinuous, meaning one strand is synthesized continuously, while the other is synthesized in fragments called Okazaki fragments.

Q: What is the relationship between a sisteron and a gene?

A sisteron is a section of DNA that codes for a specific protein. It is synonymous with a gene, as both terms refer to a specific section of DNA responsible for protein synthesis.

Q: What is the significance of the ratio of adenine to thymine and guanine to cytosine in DNA?

The ratio of adenine to thymine and guanine to cytosine in DNA remains constant in a given species. This ratio is determined by the base pairing rule and helps ensure the stability and fidelity of DNA replication.

Q: What is the one gene, one enzyme hypothesis?

The one gene, one enzyme hypothesis postulates that each gene produces a single enzyme involved in the metabolic pathway. This concept suggests that genes are responsible for specific biochemical reactions.

Q: What is the function of the Lac Operon?

The Lac Operon regulates the gene responsible for lactose fermentation in bacteria. It controls the expression and production of three enzymes involved in lactose metabolism.

Q: How does the removal of RNA polymerase 3 impact protein synthesis?

RNA polymerase 3 is responsible for the synthesis of transfer RNA (tRNA) and ribosomal RNA (rRNA). If it is removed from the nucleoplasm, the synthesis of tRNAs and rRNAs, crucial for protein synthesis, will be affected.

Summary & Key Takeaways

• DNA replication is a semi-conservative and semi-discontinuous process, where one strand of DNA is continuous and the other is discontinuous.

• A sisteron is a section of DNA that codes for a specific protein, making it synonymous with a gene.

• The ratio of adenine to thymine and guanine to cytosine remains constant in a given species.

• The one gene, one enzyme hypothesis states that each gene produces a single enzyme involved in the metabolic pathway.

• The Lac Operon regulates the gene responsible for lactose fermentation.

• Removal of RNA polymerase 3 from the nucleoplasm affects the synthesis of tRNAs and rRNA.