DNA - The Code of Life Quiz

Cancer is a disease in which cells

• grow and divide uncontrollably

• die before they cay mature

• stop producing DNA

• die during mitosis

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Which of these traits is controlled by a gene with multiple alleles?

• straight hairline

• smile dimples

• widow's peak

• blood type

Which of these is an example of the benefits of genetic engineering?

• cross-breeding to create disease-resistant crops

• creating human insulin to treat people with diabetes

• analyzing karyotypes and pedigree charts

• growing a new plant from cutting

The order of the bases along a gene determines the order in which

• sugars are put together to form a carbohydrate.

• phosphates are arranged in DNA.

• amino acids are put together to form a protein.

• chromosomes are arranged in the nucleus.

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A carrier is a person who has

• one recessive and one dominant allele for a trait.

• two recessive alleles for a trait.

• two dominant alleles for a trait.

• more than two alleles for a trait.

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During DNA replication, adenine (A) always pairs with

• guanine (G)

• cytosine (C)

• thymine (T)

• adenine (A)

Sex-linked genes are genes on

• the X chromosome only.

• the Y chromosome only.

• the X and Y chromosomes.

• all 23 pairs of chromosomes.

What does messenger RNA do during protein synthesis?

• copies the coded message from the DNA and carries it into the cytoplasm

• copies the coded message from the DNA and carries it into the nucleus

• carries amino acids and adds them to the growing protein

• copies the coded message from the protein and carries it into the nucleus

How can a mutation affecting skin be harmful to an animal?

• It can make the animal more visible to its prey or predators.

• It can cause disease in the animal.

• It can make the animal resistant to certain diseases.

• It can make the animal resistant to drugs.

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Cancer can spread when cells break off a tumor and are carried through the body by the

• bloodstream.

• muscles.

• bones.

• lungs.