DNA & RNA

Which of the following best describes a DNA molecule?

• double helix
• contains ribose
• made of amino acids
• contains Uracil

Which of the following units are repeatedly joined together to form a strand of DNA?

• amino acids
• nucleotides
• fatty acids
• polysaccharides

Why is DNA important?

• it is very small and very complicated
• it's in everything
• it serves as the blueprint for traits of all living things
• because we eat it every day for energy

What determines the code, or information, of a DNA molecule?

• the shape (structure) of the nitrogen bases
• the order (sequence) of the nitrogen bases
• the color of the nitrogen bases
• the frequency (number) of nitrogen bases

The following picture must be

• DNA because it's double stranded
• RNA because it's single stranded
• DNA because it's single stranded
• RNA because it's double stranded

The nucleus contains DNA. Which statement BEST describes how DNA controls the working of the cell?

• It codes for proteins.

• It inhibits division of cells.

• It helps in energy transformation.

• It regulates traffic in and out of the cell.

DNA molecules contain the genetic information that determines the characteristics of a living organism. How do DNA molecules express the genetic information they contain?

• by breaking down proteins within the cell

• by directing the process of protein synthesis

• by regulating the storage of cellular proteins

• by controlling the movement of protein molecules

What aspect of the DNA molecule encodes hereditary information concerning an organism's traits?

• the molecular mass

• the sequence of base pairs

• the distribution of electrical charges

• the folded three-dimensional shape

All organisms contain DNA and RNA. What are the subunits of DNA and RNA?

• simple sugars

• amino acids

• carbohydrates

• nucleotides

There are 3 types of RNA. What are they? (Select all that apply)

• tRNA

• rRNA

• mRNA

• xRNA