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 statements correctly describes the structure and function of DNA?

The sugar in DNA is ribose, which contains an extra hydroxyl group compared to RNA.

Adenine pairs with cytosine and guanine pairs with thymine in DNA.

DNA is primarily found in the cytoplasm of eukaryotic cells.

DNA is a double helix composed of two antiparallel strands held together by hydrogen bonds between complementary bases.

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Verified step by step guidance

Step 1: Understand the basic structure of DNA. DNA is composed of nucleotides, each containing a sugar, a phosphate group, and a nitrogenous base.

Step 2: Identify the sugar in DNA. DNA contains deoxyribose sugar, which lacks one oxygen atom compared to ribose found in RNA. This means DNA does not have the extra hydroxyl group present in ribose.

Step 3: Recall base pairing rules in DNA. Adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C) through hydrogen bonds. This complementary base pairing is essential for DNA structure and function.

Step 4: Recognize the location of DNA in eukaryotic cells. DNA is primarily located in the nucleus, not the cytoplasm, although small amounts are found in mitochondria and chloroplasts.

Step 5: Summarize the correct description: DNA is a double helix made of two antiparallel strands held together by hydrogen bonds between complementary bases (A-T and G-C). This structure is fundamental to DNA's role in storing genetic information.