In 1952, Hershey and Chase confirmed Avery's (1944) conclusion that
A. DNA is the repository for hereditary information.
B. the replication of DNA is semiconservative.
C. RNA is the repository for hereditary information.
D. each DNA molecule is composed of two strands that are twisted into a double helix.
E. proteins are the repositories for hereditary information.
Answer: A
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In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with virus. This activity can be attributed to
A) the presence of transposons integrating into polymerase genes. B) the presence of viroids. C) the presence of retrotransposons. D) infection with small bacteria known as mycoplasmas. E) a novel prion infection.
An individual with blood type A marries an individual with blood type B.A. What blood types could their offspring exhibit?B. Provide the possible genotypes of parents and offspring produced.C. What pattern of inheritance is this?
What will be an ideal response?
Young birds see objects flying overhead and respond by crouching down into the nest and remaining still. Over time, some objects become familiar and the young birds do not crouch down. This type of learning is referred to as
A. operant conditioning. B. sensitization. C. associative learning. D. habituation.
The disease that has been named "acquired immune deficiency syndrome" by the medical community is caused by _________________ virus.
A) Human T-cell lymphotropic B) Human immunocompetency C) Herpes simplex