Exploring the Basics of Genes and DNA

How many genes are present in the human body?

• More than 50,000

• Exactly 20,000

• Nearly 20,000

• Less than 10,000

What is the length of DNA if it is fully extended?

• 6 inches

• 6 feet

• 3 feet

• 12 feet

Which molecule is DNA composed of?

• Sugar and protein

• Sugar, phosphate, and four bases

• Protein and four bases

• Sugar, phosphate, and two bases

What determines the specific traits and functions in organisms?

• The length of the DNA

• The number of chromosomes

• The size of the cell nucleus

• The order of bases in the DNA

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How are genes passed from one generation to the next?

• From parents to children

• Through cell division

• Through mutation

• Through proteins

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What role do gene regulators play?

• They change the DNA structure

• They turn genes on and off

• They increase the number of chromosomes

• They duplicate genes

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How many chromosomes do humans usually have?

• 46 chromosomes

• 24 pairs of chromosomes

• 30 pairs of chromosomes

• 23 chromosomes

How many pairs of chromosomes do fruit flies have?

• 39 pairs

• 4 pairs

• 11 pairs

• 21 pairs

What percentage of DNA do humans share with chimpanzees?

• 93%

• 85%

• 98.5%

• 99.5%

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What makes humans different from one another genetically?

• The number of genes

• SNPs

• The length of their DNA

• The number of chromosomes

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