Unit 6 - Gene Expression - Biology

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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Which of the following best explains the term gene expression?

• the production of proteins based on the genetic information in DNA
• the suppression of RNA polymerase
• the suppression of protein production
• the production of lipids based on the genetic information in DNA

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What is gene expression?

• a regulated process

• an easy process

• a quick process

• a slow process

CRISPR-Cas9 is a genetic modification technique that edits parts of the genome of an organism . Using this technique scientists can add, remove, or modify sections of the DNA sequence.

How can scientists use this technique to control gene expression?

• By determining the number of chromosomes in an organism

• By identifying how closely related one individual is to another

• By calculating the number of genes different organisms produce

• By activating or deactivating specific genes

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As a fertilized egg divides, the cells differentiate because they

• have different sets of DNA passed on to the daughter cells

• have different sets of genes activated in the daughter cells

• have mutations that cause different genes to appear in the daughter cells

• randomly assort the chromosomes into different daughter cells

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What is the role of mRNA in expressing specialized structures?

• Making energy available for building specialized structures

• Serving as a template for building specialized proteins

• Bonding Amino Acids to form polypeptide chains

• Serving as a stored blueprint in the nucleus for building specialized proteins

What is the role of stem cells in cell differentiation?

• They serve as a precursor for generalized cells

• These cells can turn into specialized cells and back into generalized cells when needed

• They are generalized cells that can lead to specialized cells

• They are specialized cells that can lead to generalized cells

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Which are external factors that can regulate gene expression?

• Operons

• Homeobox Genes

• Transcription Factors

• Temperature

When gene expression occurs

• A gene is mutated with either an insertion or deletion

• The gene is removed from the genotype in that cell

• The gene is passed on to the daughter cells during mitosis

• The gene is activated and used in protein synthesis

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Which reason explains why nerve cells function differently than muscle cells?

• In nerve cells all the genes are expressed.

• In muscle cells all the genes are expressed.

• In both kinds of cells the same genes are expressed.

• In both kinds of cells different genes are expressed.

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