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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

DNA strands are described as antiparallel. What does this mean?

Both strands run in the same 5' to 3' direction.

One strand runs in the 5' to 3' direction, while the other runs in the 3' to 5' direction.

The strands are identical in sequence and orientation.

The strands are parallel but have different base compositions.

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Verified step by step guidance

Understand that DNA is composed of two strands forming a double helix structure.

Recall that each DNA strand has a directionality, defined by the 5' (five prime) and 3' (three prime) ends, which refer to the carbon numbers in the sugar backbone of the DNA.

Recognize that 'antiparallel' means the two strands run in opposite directions: one strand runs from 5' to 3', and the complementary strand runs from 3' to 5'.

This opposite orientation is crucial for the base pairing and the enzymatic processes like DNA replication and transcription.

Therefore, the term 'antiparallel' specifically refers to the strands having opposite 5' to 3' directions, not the same direction or identical sequences.