Aqa biology Gene expression

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

• The two different cells become mutated
• The proteins expressed in each cell are different
• They actually have different DNA in the two types of cells.
• The genome of the different cells changes

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If an mRNA molecule has introns and exons in it, where is it?

• At a ribosome
• In the nucleus
• In a prokaryotic cell
• could be in the nucleus or the ribosome

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

____ is the activation of a gene that results in transcription.

• Gene expression
• Gene technology
• Eukaryotic expression
• Prokaryotic expression

Protein molecules around which DNA is tightly coiled in chromatin

• Histones
• Whey
• Casein
• Hemoglobin

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In eukaryotic cells, transcription cannot begin until

• the two DNA strands have completely separated and exposed the promoter.

• transcription factors have bound to the promoter.

• the 5' caps are removed from the mRNA.

• the DNA introns are removed from the template.

The parts of a gene that do NOT code for amino acids in a protein are called

• introns
• exons
• codons
• anticodons

A chemical modification of DNA that does not affect the nucleotide sequence of a gene but makes that gene less likely to be expressed.

• increased methylation

• decreased methylation

• transcription

• Increased acetylation

All cells carry the entire genome of an organism apart from:

• hair follicles and gametes.

• skin cells and gametes.

• gametes and red blood cells.

• gametes.

Gene expression is the ability for a gene to be:

• in the genome.

• transcribed.

• non-coding.

• a dominant allele.

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