Exit Quiz - DNA/RNA, Gene Expression

How many strands are in DNA?

• two

• one

• three

Which of the following are the nitrogen bases of RNA? Check all that apply.

• Adenine

• Thymine

• Cytosine

• Guanine

• Uracil

________ is the sugar group of DNA.

_________ is the sugar group of RNA.

This is a picture of RNA. True or false?

• True

• False

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 are 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 genes for black hair were activated by specific temperatures

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

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

• white hair only grows during certain times of the year

The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year. What causes this change in fur color?

• the alleles for fur color change as the arctic fox grows older

• the arctic fox has two traits for fur color that are determined at birth

• gene expression for fur color is regulated by latitude

• gene expression for fur color is regulated by temperature

Human bone, muscle, and nerve cells all contain the same number of chromosomes with the same complement of genes. What enables these cells to perform specialized activities?

• the ability of some cells to remove unnecessary DNA sequences

• the mutation of genes within each cell type

• the regulation of gene expression within each cell type

• the use of different methods of cell division