DNA/RNA & Protein Synthesis Review

Front

What are Chargaff's Rules?

Back

Chargaff's Rules state that in DNA, the amount of adenine (A) equals thymine (T) and the amount of guanine (G) equals cytosine (C). This means A pairs with T and G pairs with C.

Front

If a DNA molecule contains 20% adenine, what percentage of guanine does it contain?

Back

30% guanine, because according to Chargaff's Rules, if A is 20%, then T is also 20%, leaving 60% for G and C, which must be equal, so G is 30%.

Front

What is a missense mutation?

Back

A missense mutation is a type of gene mutation where a base substitution changes the amino acid that should have been in the sequence.

Front

What type of sugar is found in RNA nucleotides?

Back

Ribose is the sugar found in RNA nucleotides.

Front

What is the first step of DNA replication?

Back

The first step of DNA replication is that DNA is 'unzipped'.

Front

How many amino acids are used by organisms to make proteins?

Back

There are 21 amino acids used by organisms to make proteins.

Front

What is the role of ribosomes in protein synthesis?

Back

Ribosomes are the cellular structures where proteins are synthesized by translating messenger RNA (mRNA) into amino acid sequences.

Front

What is the difference between DNA and RNA?

Back

DNA contains deoxyribose sugar and is double-stranded, while RNA contains ribose sugar and is usually single-stranded.

Front

What is transcription in the context of protein synthesis?

Back

Transcription is the process of copying a segment of DNA into messenger RNA (mRNA), which carries the genetic information to the ribosome.

Front

What is translation in protein synthesis?

Back

Translation is the process where ribosomes read the mRNA sequence and assemble amino acids into a polypeptide chain to form a protein.