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

A particular triplet of bases in the template strand of DNA is 5'-AGT-3'. What is the corresponding codon in the mRNA transcribed from this DNA segment?

5'-UCA-3'

5'-UGA-3'

5'-ACU-3'

5'-TCA-3'

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Verified step by step guidance

Identify the direction of the given DNA template strand triplet, which is 5'-AGT-3'. Remember that during transcription, RNA polymerase reads the DNA template strand in the 3' to 5' direction to synthesize mRNA in the 5' to 3' direction.

Determine the complementary bases for the mRNA by pairing RNA nucleotides with the DNA template strand bases, using the base pairing rules: Adenine (A) pairs with Uracil (U) in RNA, Thymine (T) pairs with Adenine (A), Cytosine (C) pairs with Guanine (G), and Guanine (G) pairs with Cytosine (C).

Since the DNA template strand is given in the 5' to 3' direction, first reverse it to get the 3' to 5' sequence, which is the direction RNA polymerase reads. For 5'-AGT-3', the reverse is 3'-TGA-5'.

Transcribe the mRNA by writing the complementary RNA bases to the 3'-TGA-5' DNA template strand, resulting in the mRNA sequence 5'-ACU-3'.

Confirm that the mRNA codon is written in the 5' to 3' direction, which is the standard notation for codons.