DNA

DNA, Chromosomes, and Genes

DNA

• contains the sugar deoxyribose

• has a double helix shape

• made up of nucleotides (see picture on next slide)

• contains the nitrogen bases adenine, guanine, cytosine, and thymine

• these bases form the complementary base pairs of adenine and thymine (A-T) and guanine and cytosine (G-C) held together by hydrogen bonds

Multiple Choice

Which of the following base pairs are paired correctly?

• adenine and guanine

• adenine and cytosine

• guanine and thymine

• guanine and cytosine

Multiple Choice

What is the name of the sugar found in DNA?

• adenine

• ribose

• deoxyribose

• glucose

Multiple Select

Select all that are bases of DNA.

• adenine

• uracil

• guanine

• cytosine

Multiple Select

What makes up a nucleotide? There is more than one answer.

• sugar

• RNA base

• nitrogen base

• phosphate group

Chromosomes

• a chromosome is a single strand of DNA tightly coiled around special proteins

• DNA contains the “instructions” for making proteins

• Gene- a section of DNA that carries information on how to make one protein.

Multiple Choice

DNA contains the instructions for making ______.

• carbohydrates

• lipids

• proteins

• nucleic acids

Multiple Choice

Which specific part of a chromosome is a section of DNA that carries information on how to make one protein.

• centromere

• chromatid

• nucleotide

• gene