Almost all cases of cystic fibrosis, a(n) ____ genetic disorder, are the result of mating between two unaffected parents
a. mitochondrial
b. autosomal dominant
c. autosomal recessive
d. X-linked dominant
e. X-linked recessive
c
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The major opposition to the Extraterrestrial Hypothesis is
A. not enough organic carbon molecules could have been transported to the Earth's surface by comets and asteroids. B. most organic carbon molecules, including nucleic acids and amino acids, would have been destroyed by the intense heating that occurs when large bodies fall through the Earth's atmosphere. C. not enough comets and asteroids hit the Earth to deliver organic carbon molecules to the surface. D. most of the organic carbon molecules would have fallen into the seas, helping life form in the water but not on the land. E. without oxygen in the atmosphere the organic carbons that did fall would have been rapidly reduced to inorganic carbon compounds.
In snapdragons, pink-flowered plants are produced when red-flowered plants are crossed with white-flowered plants. This type of inheritance can best be described as
A. incomplete dominance. B. simple dominant and recessive traits. C. sex-linked traits. D. codominance.
Which statement is NOT true about DNA replication in prokaryotes?
A. Replication begins at a single origin of replication. B. Replication is bidirectional from the origin(s). C. Since bacterial cells replicate so rapidly, a second round of replication may begin before the first has been completed. D. Replication occurs at about 1 million base pairs per minute. E. There are many bacterial chromosomes, with replication occurring in each at the same time.
Cockroach feces and shed skins can cause a severe inflammatory response in the bronchioles and muscle spasms in the bronchiole smooth muscles. This disorder is known as ________
A) laryngitis B) emphysema C) asthma D) TB