DNA structure and replication 22-23

Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG

• ATG TGA CAG
• TAC ACT GTC
• GTA AGT GAC
• CAT TCA CTG

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

In a strand of DNA Adenine bonds with

• Guanine

• Thymine

• Cytosine

• Adenine

Scientists can use genetic information to identify people because it is unique to each person. Which specific characteristic is unique to an individual?

• The shape if the DNA molecules in cells

• The number of chromosomes in each cell

• The sequence of DNA nucleotides in cells

• The size of each chromosome in a cell

In a strand of DNA Guanine bonds with

• Adenine

• Guanine

• Cytosine

• Thymine

Why is DNA important?

• it is very small and very complicated

• it is bacteria

• it serves as the blueprint for traits of all living things

• because we eat it every day for energy

Which 2 molecules form the sides (backbone) of the DNA ladder?

• deoxyribose sugar and adenine
• deoxyribose sugar and the nucleus
• deoxyribose sugar and phosphate

Which organelle is DNA usually found in?

• cell membrane
• vacuole
• chloroplast
• nucleus

In 1869, DNA was discovered within the nuclei of cells. By the 1940s, scientists knew that chromosomes were made of both DNA and protein but did not know which was the genetic material of cells. In the 1950’s scientists demonstrated that DNA is the material responsible for heredity. In 1953, using information collected by other scientists, an American biologist and an English physicist built a three-dimensional model of DNA. These discoveries best illustrate the importance of-

• independent research

• replication of results

• collaborative efforts among scientists

• recent improvements in the scientific method