TEK 6D

Snowshoe hares change coat color during the year. In the summer, when there is no snow on the ground, their coat is brown. In the winter when there is snow, their coat is white. Which describes the genetic basis for seasonal changes in coat color?

• The snow causes mutations in the genes

• The genes are regulated by hormone signals that are altered by changes in the environment

• Sunlight causes cancer cells to develop

• The genes are deleted during the summer

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

How is the information in a DNA molecule expressed in an organism?

• through plasmids
• through RNA polymerase
• through recombinant DNA
• through proteins

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

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

The Himalayan rabbit's habitat has cold, snowy winters and mild summers. The body is typically covered in white fur except for the nose, feet, tail, and ears, which are covered in black fur.

A scientist shaved an area of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area . The shaved area grew black fur.

Which of these best explains why the hair that grew back where the Ice pack was placed was black and not white?

• The white hair mutated to black hair as the rabbit's body temperature decreased.

• The coat color changed from white to black with the age of the rabbit.

• The genes for black hair were activated by specific temperatures.

• White hair only grows during certain times of the year.

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

What is the role of transcription factors in gene expression?

• They bind to the promoter region of a gene and prevent transcription.

• They bind to the promoter region of a gene and initiate transcription.

• They bind to the terminator region of a gene and initiate transcription.

• They bind to the terminator region of a gene and prevent transcription.

How does the environment influence gene expression?

• Environmental factors can cause mutations in the DNA sequence.

• Environmental factors can alter the structure of the DNA molecule.

• Environmental factors can influence the activity of transcription factors.

• Environmental factors have no influence on gene expression.

What is the role of RNA in gene expression?

• RNA carries the genetic information from the DNA to the ribosomes where proteins are synthesized.

• RNA carries the genetic information from the ribosomes to the DNA where proteins are synthesized.

• RNA carries the genetic information from the DNA to the mitochondria where proteins are synthesized.

• RNA carries the genetic information from the mitochondria to the DNA where proteins are synthesized.