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

3. Extensions to Mendelian Inheritance

Overview of interacting Genes

Genetics

3. Extensions to Mendelian Inheritance

Overview of interacting Genes

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Multiple Choice

Which of the following statements about microRNAs (miRNAs) is true?

miRNAs are only found in prokaryotic organisms.

miRNAs are small non-coding RNAs that regulate gene expression by binding to complementary sequences on target mRNAs.

miRNAs are translated into proteins that directly modify DNA sequences.

miRNAs increase the stability and translation of their target mRNAs.

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Verified step by step guidance

Step 1: Understand what microRNAs (miRNAs) are. miRNAs are small non-coding RNA molecules, typically about 20-24 nucleotides long, that play a role in regulating gene expression.

Step 2: Recognize that miRNAs are found primarily in eukaryotic organisms, not prokaryotes. This means the statement that miRNAs are only found in prokaryotic organisms is false.

Step 3: Know that miRNAs do not code for proteins. Instead, they function by binding to complementary sequences on target messenger RNAs (mRNAs), which affects the mRNA's stability or translation.

Step 4: Understand the mechanism of miRNA action: they usually repress gene expression by either causing degradation of the target mRNA or inhibiting its translation, rather than increasing stability or translation.

Step 5: Conclude that the true statement is that miRNAs are small non-coding RNAs that regulate gene expression by binding to complementary sequences on target mRNAs.