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 of the following could contain the sequence 5'-gaacga-3'?

A tRNA molecule lacking any guanine bases

A single-stranded region of DNA

A double-stranded DNA molecule with only A-T base pairs

A protein-coding region composed entirely of uracil

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Verified step by step guidance

Understand the sequence given: 5'-gaacga-3'. This is a nucleotide sequence composed of the bases guanine (g), adenine (a), and cytosine (c).

Analyze each option to see if it can contain this sequence. Remember that DNA uses bases A, T, G, and C; RNA uses A, U, G, and C; and proteins are made of amino acids, not nucleotides.

For the tRNA molecule lacking any guanine bases, check if the sequence contains guanine (g). Since the sequence has 'g', it cannot be present in a molecule without guanine.

For a double-stranded DNA molecule with only A-T base pairs, consider that guanine (g) and cytosine (c) are not present, so the sequence containing 'g' and 'c' cannot be found here.

For a single-stranded region of DNA, there are no restrictions on base pairing, so the sequence 5'-gaacga-3' can exist as is. For a protein-coding region composed entirely of uracil, since uracil (u) replaces thymine in RNA and the sequence contains guanine and cytosine, it cannot be present.