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

Genetic Code

Anatomy & Physiology

3. Energy & Cell Processes

Genetic Code

Previous problemNext problem

1:24 minutes

Problem 13

Textbook Question

If DNA has a sequence of AAA, then a segment of mRNA synthesized on it will have a sequence of:
a. TTT
b. UUU
c. GGG
d. CCC

Verified step by step guidance

Understand the process of transcription: Transcription is the process by which a segment of DNA is used as a template to synthesize mRNA. During this process, complementary base pairing occurs between the DNA nucleotides and the mRNA nucleotides.

Recall the base pairing rules: In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). However, in RNA, thymine (T) is replaced by uracil (U). Therefore, adenine (A) in DNA pairs with uracil (U) in RNA.

Identify the DNA sequence provided: The DNA sequence given is 'AAA'. This means that the mRNA will be synthesized using this sequence as a template.

Apply the base pairing rules to the DNA sequence: For each adenine (A) in the DNA sequence, the complementary base in mRNA will be uracil (U). Thus, the mRNA sequence will consist of 'UUU'.

Review the options provided: Based on the base pairing rules and the synthesized mRNA sequence, determine which option matches the mRNA sequence. The correct answer corresponds to 'UUU'.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

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

DNA and RNA Structure

DNA (deoxyribonucleic acid) is a double-stranded molecule that contains the genetic blueprint of an organism, while RNA (ribonucleic acid) is typically single-stranded and plays a crucial role in protein synthesis. The key difference is that RNA contains uracil (U) instead of thymine (T), which is found in DNA.

Transcription Process

Transcription is the process by which a segment of DNA is copied into mRNA by the enzyme RNA polymerase. During this process, the DNA sequence is read, and complementary RNA nucleotides are assembled to form a strand of mRNA, where adenine (A) pairs with uracil (U) instead of thymine.

Base Pairing Rules

Base pairing rules dictate how nucleotides pair in DNA and RNA. In DNA, adenine pairs with thymine, and cytosine pairs with guanine. In RNA, adenine pairs with uracil, and cytosine still pairs with guanine. Understanding these rules is essential for predicting the mRNA sequence synthesized from a given DNA template.