Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

7. DNA and Chromosome Structure

DNA Structure

Genetics

7. DNA and Chromosome Structure

DNA Structure

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Multiple Choice

Which RNA nucleotide is complementary to thymine in DNA during transcription?

Adenine

Guanine

Cytosine

Uracil

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Verified step by step guidance

Recall that during transcription, the DNA sequence is used as a template to synthesize RNA. The base pairing rules between DNA and RNA are similar to DNA replication, but with one key difference: RNA contains uracil (U) instead of thymine (T).

Identify the base in DNA that pairs with thymine (T). In DNA, adenine (A) pairs with thymine (T) through two hydrogen bonds.

Since RNA uses uracil (U) instead of thymine, the RNA nucleotide that pairs with adenine (A) in DNA is uracil (U).

Therefore, when the DNA template strand has thymine (T), the complementary RNA nucleotide incorporated during transcription is adenine (A). Conversely, when the DNA template has adenine (A), the RNA nucleotide incorporated is uracil (U).

In this problem, since thymine (T) is on the DNA strand, the complementary RNA nucleotide that pairs with it during transcription is adenine (A). The answer 'Uracil' corresponds to the RNA nucleotide complementary to adenine in DNA, not thymine.