Unit 3 AP Biology (Gene Expression) 24-25

Front

What are introns?

Back

Introns are the non-coding segments of a gene that do not code for amino acids in a protein.

Front

In DNA, which base pairs with adenine?

Back

Thymine pairs with adenine in DNA.

Front

What are purines?

Back

Purines are a type of nitrogenous base that includes adenine and guanine.

Front

In RNA, which base pairs with adenine?

Back

Uracil pairs with adenine in RNA.

Front

What is a frameshift mutation?

Back

A frameshift mutation occurs when one or more nucleotide bases are added or deleted from the DNA sequence, altering the reading frame.

Front

What are exons?

Back

Exons are the coding segments of a gene that are expressed and translated into proteins.

Front

What is the role of codons?

Back

Codons are sequences of three nucleotides in mRNA that specify a particular amino acid during protein synthesis.

Front

What is the difference between DNA and RNA?

Back

DNA is double-stranded and contains thymine, while RNA is single-stranded and contains uracil instead of thymine.

Front

What is a nonsense mutation?

Back

A nonsense mutation is a change in the DNA sequence that creates a premature stop codon, leading to a truncated protein.

Front

What is a missense mutation?

Back

A missense mutation is a change in the DNA sequence that results in the substitution of one amino acid for another in a protein.