Nucleotides and RNA

Which of the following is a component of a nucleotide?

• Amino acid

• Fatty acid

• Nitrogenous base

• Glycerol

In RNA, the nitrogenous base thymine is replaced by which other base?

• Adenine

• Guanine

• Uracil

• Cytosine

Which type of RNA is responsible for carrying the DNA sequence for protein production from the nucleus?

• rRNA

• mRNA

• tRNA

• snRNA

A silent mutation is characterized by:

• A change in the DNA sequence that always affects protein function.

• An insertion or deletion of nucleotides.

• No change in the protein sequence.

• A change in the DNA sequence that always results in a different protein being added.

Viruses are described in the source as:

• Capable of producing their own proteins.

• Large particles containing hundreds of thousands of genes.

• Small particles containing 3 to 200 genes.

• Essential for cellular protein production in all organisms.

Nucleic acids are made up of strings of molecules called ____________.

DNA contains the purines adenine and guanine, and the pyrimidines cytosine and ________.

rRNA is considered the protein factory where the _________ sequence is interpreted into an amino acid sequence.

The tRNA has a three-base sequence called a(n) _________.

According to the source, in DNA, there will always be equal numbers of _________ and thymine.