Major Histocompatibility Complex (MHC) genes are expressed in immune cells when the cells are exposed to specific pathogens, allowing the body to recognize infected cells. Approximately 24 hours after exposure to the pathogen, MHC gene expression is at its peak.

The table below shows the levels of MHC genes expressed each hour after exposure.

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Between hours 0-12, there is of MHC genes expressed.

Lastly, after 120 hours, there is .

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Two students are debating with each other about the results of the table.

Student 1 says: The expression of MHC genes increases after exposure to the pathogen.

Student 2 says: Expression of MHC genes is consistent (does not change).

Based on what you know, .

Environmental factors, such as temperature, diet, or light, can cause cells to activate different genes at different times.

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For example, flamingos have pink feathers whenever they eat shrimp because they produce proteins called carotenoids. However, they turn pale white if they do not eat enough shrimp.

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When flamingos eat shrimp, they the gene for pink color, and their feathers are pale white.

In this scenario, the factor that influences gene expression is

Environmental factors cause cells to replicate at different rates.

Environmental factors cause cells to use specific sections of DNA to express specific proteins.

Environmental factors cause cells mutate as a survival response.

Environmental factors do not impact the expression of genes for an organism.

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Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.
What is responsible for the difference observed in male and female lions?

The expression of certain genes are regulated (controlled) by biological sex.

The expression of these genes are not affected differently.

The expression of these genes are caused by changes in temperature.

The expression of these genes are caused by random mutations.

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Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.
How does Rogaine help people grow their hair back?

Rogaine regulates the expression of the gene responsible for hair growth.

Rogaine changes the temperature that hair can grow in.

Rogaine causes silent mutations in the DNA sequence.

Rogaine does not help people grow their hair back.

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Snowshoe hares can be found living in the Rocky Mountains of New Mexico. During the summer months, when there is no snow on the ground, the snowshoe hare’s coat color is typically brown.

During the winter months, when the mountains are covered in snow, the snowshoe hare’s coat is typically white. Which statement describes the genetic basis for the seasonal changes in coat color?

The genes that control coat color in snowshoe hares are deleted from the genome during the summer months.

The genes that control coat color are regulated by hormone signals that are altered by changes in environmental factors.

Sunlight causes cancer cells to develop in the bodies of snowshoe hares, resulting in an apparent brown-colored coat as a result of hair loss.

The snow causes mutations in the genes that regulate coat color so that snowshoe hares are adapted to their environment during the winter months.

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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 activating or deactivating specific genes

By calculating the number of genes different organisms produce

By identifying how closely related one individual is to another

By determining the number of chromosomes in an organism

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Environmental factors typically activate genes in a cell by causing the cell to --

form haploid cells through meiosis

fuse with another cell to increase the size of its genome

transcribe specific DNA segments to mRNA for translation

produce identical daughter cells through mitosis

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The expression of genes in an organism can be influenced by the environment. Internal factors and external factors can all impact which part of an organism's genes are expressed.

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When exposed to extreme heat, plants activate genes that trigger stress response mechanisms, leading to the production of protective proteins, like heat shock proteins (HSPs), and antioxidants to minimize damage caused by the high temperature.

The factor that triggered the plant's reaction was a(n) . This caused factor. The COL1A1 gene is collagen.

Unit 4 Test Review Part 2: Gene Expression

Unit 4 Test Review Part 2: Gene Expression

How does transcription and translation result in the expression of genes?

E. coli has three gene that each code for different enzymes that break down lactose. Scientists conducted investigations about the production of these enzymes using samples of E. coli. Their results are shown in the table.

pGLO is a gene found in jellyfish that codes for green fluorescent protein (GFP). When GFP is produced, jellyfish will glow under UV light.

Scientists observed a colony of E. coli (bacteria) under UV light and noticed they do not glow. However, once the pGLO gene was introduced to the bacteria, they started to glow.

Major Histocompatibility Complex (MHC) genes are expressed in immune cells when the cells are exposed to specific pathogens, allowing the body to recognize infected cells. Approximately 24 hours after exposure to the pathogen, MHC gene expression is at its peak.

The table below shows the levels of MHC genes expressed each hour after exposure.

Environmental factors, such as temperature, diet, or light, can cause cells to activate different genes at different times.

For example, flamingos have pink feathers whenever they eat shrimp because they produce proteins called carotenoids. However, they turn pale white if they do not eat enough shrimp.

Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.
What is responsible for the difference observed in male and female lions?

Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.
How does Rogaine help people grow their hair back?

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?

Environmental factors typically activate genes in a cell by causing the cell to --

How does transcription and translation result in the expression of genes?

E. coli has three gene that each code for different enzymes that break down lactose. Scientists conducted investigations about the production of these enzymes using samples of E. coli. Their results are shown in the table.

What factor determines if there is a high concentration or low concentration of the enzyme?

Which conclusion about the production of enzymes can be determined by analyzing the scientists' results?

pGLO is a gene found in jellyfish that codes for green fluorescent protein (GFP). When GFP is produced, jellyfish will glow under UV light.

Scientists observed a colony of E. coli (bacteria) under UV light and noticed they do not glow. However, once the pGLO gene was introduced to the bacteria, they started to glow.

Major Histocompatibility Complex (MHC) genes are expressed in immune cells when the cells are exposed to specific pathogens, allowing the body to recognize infected cells. Approximately 24 hours after exposure to the pathogen, MHC gene expression is at its peak.

The table below shows the levels of MHC genes expressed each hour after exposure.

Environmental factors, such as temperature, diet, or light, can cause cells to activate different genes at different times.

For example, flamingos have pink feathers whenever they eat shrimp because they produce proteins called carotenoids. However, they turn pale white if they do not eat enough shrimp.

Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.
What is responsible for the difference observed in male and female lions?

Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.
How does Rogaine help people grow their hair back?

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?

Environmental factors typically activate genes in a cell by causing the cell to --

What factor determines if there is a high concentration or low concentration of the enzyme?

Which conclusion about the production of enzymes can be determined by analyzing the scientists' results?

Unit 4 Test Review Part 2: Gene Expression

Unit 4 Test Review Part 2: Gene Expression

How does transcription and translation result in the expression of genes?

E. coli has three gene that each code for different enzymes that break down lactose. Scientists conducted investigations about the production of these enzymes using samples of E. coli. Their results are shown in the table.

pGLO is a gene found in jellyfish that codes for green fluorescent protein (GFP). When GFP is produced, jellyfish will glow under UV light.

Scientists observed a colony of E. coli (bacteria) under UV light and noticed they do not glow. However, once the pGLO gene was introduced to the bacteria, they started to glow.

Major Histocompatibility Complex (MHC) genes are expressed in immune cells when the cells are exposed to specific pathogens, allowing the body to recognize infected cells. Approximately 24 hours after exposure to the pathogen, MHC gene expression is at its peak.

The table below shows the levels of MHC genes expressed each hour after exposure.

Environmental factors, such as temperature, diet, or light, can cause cells to activate different genes at different times.

For example, flamingos have pink feathers whenever they eat shrimp because they produce proteins called carotenoids. However, they turn pale white if they do not eat enough shrimp.

Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.What is responsible for the difference observed in male and female lions?

Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.How does Rogaine help people grow their hair back?

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?

Environmental factors typically activate genes in a cell by causing the cell to --

How does transcription and translation result in the expression of genes?

E. coli has three gene that each code for different enzymes that break down lactose. Scientists conducted investigations about the production of these enzymes using samples of E. coli. Their results are shown in the table.

What factor determines if there is a high concentration or low concentration of the enzyme?

Which conclusion about the production of enzymes can be determined by analyzing the scientists' results?

pGLO is a gene found in jellyfish that codes for green fluorescent protein (GFP). When GFP is produced, jellyfish will glow under UV light.

Scientists observed a colony of E. coli (bacteria) under UV light and noticed they do not glow. However, once the pGLO gene was introduced to the bacteria, they started to glow.

Major Histocompatibility Complex (MHC) genes are expressed in immune cells when the cells are exposed to specific pathogens, allowing the body to recognize infected cells. Approximately 24 hours after exposure to the pathogen, MHC gene expression is at its peak.

The table below shows the levels of MHC genes expressed each hour after exposure.

Environmental factors, such as temperature, diet, or light, can cause cells to activate different genes at different times.

For example, flamingos have pink feathers whenever they eat shrimp because they produce proteins called carotenoids. However, they turn pale white if they do not eat enough shrimp.

Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.What is responsible for the difference observed in male and female lions?

Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.How does Rogaine help people grow their hair back?

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?

Environmental factors typically activate genes in a cell by causing the cell to --

What factor determines if there is a high concentration or low concentration of the enzyme?

Which conclusion about the production of enzymes can be determined by analyzing the scientists' results?

Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.
What is responsible for the difference observed in male and female lions?

Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.
How does Rogaine help people grow their hair back?

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?

Both male and female lions have genes in their DNA for producing manes (long hair around the neck). However, only the male lions are able to grow out their mane to attract a mate.
What is responsible for the difference observed in male and female lions?

Hair loss is caused whenever people do not produce enough keratin. However, an ointment called "Rogaine" can help with hair growth.
How does Rogaine help people grow their hair back?

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?