6.1 Mastery Check

1. The DNA double helix looks like a twisted ladder. ​ (a)   make up each rung of the ladder. ​ (b)   holds the rungs together at the sides. ​ (c)   hold the rungs together in the middle.

• Nitrogen bases
• Sugar-phosphate backbone
• Hydrogen bonds

1. How many strands make up a DNA double helix?

• One

• Two

• Three

• Four

1. How many strands make up a RNA helix?

• One

• Two

• Three

• Four

What are the four nitrogen bases of DNA?

• Adenine

• Thymine

• Uracil

• Guanine

• Cytosine

What are the four nitrogen bases of RNA?

• Adenine

• Thymine

• Uracil

• Guanine

• Cytosine

One side of a DNA strand is coded AGTCAGGATTC, what is the other side of the DNA strand?

What are the three types of RNA?

• mRNA

• tRNA

• rRNA

• dRNA

1. Phosphate and deoxyribose make up what part of DNA?

• The ladder rungs

• The sides of the double helix

• The paired nitrogen bases

• The sugar

1. Where can ribosomes be found in the cell?

• Free floating in the nucleus

• Attached to the rough endoplasmic reticulum

• Attached to the smooth endoplasmic reticulum

• Free floating in the cytoplasm

1. Ribosomes consist of ___ subunit(s).