Biology Gene Expression & Regulation

Front

What is gene expression?

Back

Gene expression is the process by which information from a gene is used to synthesize a functional gene product, typically proteins.

Front

What role do environmental factors play in gene expression?

Back

Environmental factors can influence the regulation of gene expression, affecting how genes are turned on or off.

Front

Why do different cell types (e.g., muscle vs. nerve cells) have different functions despite having the same DNA?

Back

Different cell types express different sets of genes, leading to the production of different proteins that determine their functions.

Front

What is the central dogma of molecular biology?

Back

The central dogma describes the flow of genetic information from DNA to RNA to protein.

Front

What is the significance of transcription in gene expression?

Back

Transcription is the first step in gene expression, where a specific segment of DNA is copied into RNA.

Front

Where does translation occur in a cell?

Back

Translation occurs outside of the nucleus, primarily in the cytoplasm on ribosomes.

Front

What is the relationship between DNA bases in a double-stranded DNA molecule?

Back

In double-stranded DNA, adenine pairs with thymine, and cytosine pairs with guanine, maintaining base pairing rules.

Front

If a DNA molecule has 15% adenine, what percentage of guanine would it have?

Back

It would have 35% guanine, as the total percentage of A and T equals the total percentage of C and G.

Front

What is a mutation?

Back

A mutation is a change in the DNA sequence that can lead to changes in gene expression and function.

Front

What is the function of ribosomes in protein synthesis?

Back

Ribosomes are the cellular machinery that facilitate the translation of mRNA into a polypeptide chain (protein).