Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Introduction to DNA Replication

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to DNA Replication

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Problem 19c

Textbook Question

Mark the following statements about the cell cycle as true or false. If a statement is false, correct it to make a true statement.
The main enzyme that builds the new DNA strands during DNA synthesis is RNA synthetase.

Verified step by step guidance

Understand the context of the cell cycle: The cell cycle consists of several phases, including interphase (G1, S, G2) and mitotic phase (M). DNA synthesis occurs during the S phase of interphase.

Identify the role of enzymes in DNA synthesis: During the S phase, the main enzyme responsible for building new DNA strands is DNA polymerase, not RNA synthetase. RNA synthetase is involved in RNA synthesis, not DNA replication.

Evaluate the statement: The statement claims that RNA synthetase is the main enzyme for DNA synthesis. This is false because DNA polymerase is the correct enzyme for this process.

Correct the false statement: Replace 'RNA synthetase' with 'DNA polymerase' to make the statement true. The corrected statement should read: 'The main enzyme that builds the new DNA strands during DNA synthesis is DNA polymerase.'

Review the corrected statement: Ensure the corrected statement aligns with the biological process of DNA replication during the cell cycle and accurately reflects the role of DNA polymerase.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cell Cycle

The cell cycle is a series of phases that a cell goes through to grow and divide. It consists of interphase (G1, S, G2) and the mitotic phase (M). Understanding the cell cycle is crucial for recognizing how cells replicate their DNA and prepare for division, which is fundamental in biology and medicine.

DNA Synthesis

DNA synthesis, or DNA replication, is the process by which a cell duplicates its DNA before cell division. This process occurs during the S phase of interphase and involves enzymes that synthesize new DNA strands complementary to the original strands, ensuring genetic continuity. The main enzyme responsible for this is DNA polymerase, not RNA synthetase.

Enzymes in DNA Replication

Enzymes play critical roles in DNA replication, facilitating the unwinding of the DNA double helix and the synthesis of new strands. DNA polymerase is the key enzyme that adds nucleotides to form new DNA strands, while other enzymes, such as helicase and ligase, assist in unwinding the DNA and joining Okazaki fragments, respectively. Understanding these enzymes is essential for grasping how DNA replication occurs accurately.