Gene Expression

What functions as the on off switch for mRNA transcription

• transcription factors

  (Gene Expression)

• translation factors

• transgenic factors

• transportation factors

DNA molecule segment is : TTACGCAAG The mutated DNA segment is TTCGCAAG. This is an example of ___ mutation.

• Substitution

• Deletion

• Insertion

• Inversion

What mutation has occurred here?  T-G-A-C-C-A T-G-A-G-C-A

• Substitution

• Deletion

• Insertion

• Frameshift 

A change in the sequence GAG to GGG would 

• change the amino acid from Glu to Gly

• changes the amino acid from Leu to Phe

• change the amino acid from Leu to STOP

• does not change the amino acid

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

How is information for a specific protein carried on the DNA molecule?

• as a sequence of nucleotides

• in the double helix shape of the condensed chromosome

• in the ratio of adenines to thymines

• as a pattern of phosphates and sugars

Which of these is the purpose of translation?

• produce protein

• produce ribosomes

• produce tRNA

• produce genes

What process must occur before translation can happen?

• DNA is used to make mRNA during replication

• DNA is used to make mRNA during transcription

What role do cell signals play in cell specialization?

• Cell signals encourage DNA replication at the promoter.

• Cell signals silence genes unrelated to the cell's purpose.

• Cell signals are influenced by temperature changes.

• None of the above.