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 Heart2h 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

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Multiple Choice

Which of the following sequences of nucleotides are possible in the template strand of DNA that would code for the polypeptide sequence Phe–Leu–Ile–Val?

5′–TTG–CTA–CAG–TAG–3′.

5′–AUG–CTG–CAG–TAT–3′.

3′–AAA–AAT–ATA–ACA–5′.

3′–AAA–GAA–TAA–CAA–5′.

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Verified step by step guidance

Understand that the template strand of DNA is complementary to the mRNA strand, which is used during translation to form a polypeptide chain.

Identify the mRNA codons that code for the amino acids Phe, Leu, Ile, and Val using the codon chart. Phe is coded by UUU or UUC, Leu by UUA, UUG, CUU, CUC, CUA, or CUG, Ile by AUU, AUC, or AUA, and Val by GUU, GUC, GUA, or GUG.

Convert the mRNA codons to the corresponding DNA template strand. Remember that in DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Uracil (U) in RNA is replaced by thymine (T) in DNA.

For the polypeptide sequence Phe–Leu–Ile–Val, the mRNA sequence could be UUU–UUA–AUU–GUU. Convert this to the DNA template strand: AAA–AAT–TAA–CAA.

Verify the sequence by checking each codon conversion: UUU (Phe) to AAA, UUA (Leu) to AAT, AUU (Ile) to TAA, and GUU (Val) to CAA. This matches the correct answer provided.