About This Chapter
MCAS STE Biology: DNA Replication - Chapter Summary
DNA contains all of the pieces that make us exactly who we are. Every cell in our body that contains a nucleus also contains DNA. Therefore, when new cells are being formed, our DNA must be replicated. In this chapter we will review with you the process of DNA replication so that you can feel prepared for related questions on the MCAS STE Biology exam. The lessons will cover:
- Conservative, semi-conservative and dispersive replication
- Unwinding of the double helix before replication
- How DNA polymerase and RNA primase is used to begin reproduction
- The leading strand and the functions of DNA polymerase
- Enzymes, replication bubbles, leading and lagging strands
The lessons in this chapter have been carefully formulated to provide you with effective methods for learning and retaining DNA material. Each lesson contains a video along with its transcript for visual and text-based learning. There is a clickable timeline below each video so you can return to a particular section if you need to review it. Use the self-assessment quizzes at the end of each lesson for you to gauge how well you understand the material.
MCAS STE Biology: DNA Replication Chapter Objectives
The MCAS STE Biology exam is a standardized test taken by high school students in Massachusetts. The exam assesses students' level of proficiency in biology as determined by the Massachusetts Curriculum Framework. The exam consists of five main content areas related to biology. The information covered in this chapter will help prepare you for questions on the test related to genetics, which account for 20% of the entire score.
The MCAS STE Biology exam is comprised of 40 multiple-choice questions and 5 open-ended responses. The open-ended responses could be related to any of the five content areas so it's important to study for all of them. You will need to pass one of the four STE exams with a score of 220 or higher to qualify for graduation.
1. What Is DNA Replication? - Conservative, Semi-Conservative & Dispersive Models
How do we know that DNA replication is semi-conservative? How do we know it's not conservative or dispersive? Let's follow the famous experiment by Meselson and Stahl to find out!
2. How Helicase Unwinds the DNA Double Helix in Preparation for Replication
How does semi-conservative replication begin? Discover how DNA helicase creates a replication fork to unwind the complicated DNA molecule and allow daughter strands to form on the parental template.
3. How DNA Polymerase and RNA Primase Initiate DNA Replication
How do enzymes assist in starting DNA replication? In this lesson, we explore the work of a contributing enzyme, DNA polymerase, and learn how the RNA primer is made by the action of RNA primase.
4. DNA Replication: The Leading Strand and DNA Polymerase Activities
How does replication occur in the antiparallel DNA molecule? In this lesson, explore the significance of the leading and lagging strands, and learn how Okazaki fragments and RNA ligase make DNA replication possible.
5. DNA Replication: Review of Enzymes, Replication Bubbles & Leading and Lagging Strands
Feeling lost in the thorny details of DNA replication? This lesson provides an overview of semi-conservative replication, with a focus on putting together all of the concepts involved. We'll review the work of each enzyme on our way to completing the big picture of DNA replication.
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Other chapters within the MCAS - Science & Technology-Engineering - Biology: Test Prep & Practice course
- MCAS STE Biology: Chemistry of Life
- MCAS STE Biology: Enzymatic Biochemistry
- MCAS STE Biology: Organelles
- MCAS STE Biology: Cellular Structure & Transport
- MCAS STE Biology: Classification & Evolution
- MCAS STE Biology: Cellular Respiration & Photosynthesis
- MCAS STE Biology: Cell Growth & Reproduction
- MCAS STE Biology: Transcription & Translation
- MCAS STE Biology: Genetics & Heredity
- MCAS STE Biology: Digestive & Circulatory Systems
- MCAS STE Biology: Nervous & Endocrine Systems
- MCAS STE Biology: Respiratory & Musculoskeletal Systems
- MCAS STE Biology: The Reproductive System
- MCAS STE Biology: Evolution & Biodiversity
- MCAS STE Biology: Ecology
- MCAS STE Biology: Scientific Method & Inquiry
- MCAS STE Biology: The Science Lab
- MCAS STE Biology: Using Mathematics in Science
- MCAS - Science & Technology-Engineering - Biology Flashcards