A researcher decides to test the scientific validity of the common phrase “An apple a day keeps the doctor away.” What would be a valid hypothesis to investigate this specific question?
A. Eating apples decreases the frequency of contracting a cold.
B. The daily consumption of a single apple does not change the number of visits to the doctor.
C. Eating one apple every day is good for you.
D. Apples are high in vitamin C.
E. Those who consume apples have longer lifespans than those who do not consume apples.
B. The daily consumption of a single apple does not change the number of visits to the doctor.
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If current changes in ocean temperature and pH caused a mass extinction of today's reefbuilding organisms,
A. we would see an unprecedented mass extinction, unlike anything the earth has experienced in the past. B. we would see one more in a series of mass extinctions that have wiped out reefs at least 3 times since the first reefs appeared over 500 million years ago. C. we would see one more in a series of mass extinctions that have wiped out reefs at regular intervals – roughly every 10 million years since the first reefs were formed over 500 million years ago. D. we would see the second great mass extinction of reefs; the only previous such extinction took place at the end of the Permian. E. none of these
You are examining an ecosystem and notice a large bird. When you measure its temperature, you find it to be constant in sun or shade, wind or still air. This indicates the bird is a(n)
A. homotherm. B. ectotherm. C. endotherm. D. positherm. E. thermophile.
Which of the following statements about the F2
generation produced in the dihybrid cross is NOT true? a. All offspring with the same phenotype have the same genotype. b. All offspring with the same genotype possess the same phenotype. c. It is not possible to determine the genotype of some individuals by their phenotype. d. It is possible to tell the genotype of some offspring by looking at their phenotypes. e. Nine genotypes and four phenotypes are produced.
Which of the following is true regarding single pass transmembrane proteins?
A. They traverse the membrane more than once and can only be extracted by using detergents B. Have 2-20 hydrophobic segments C. Protrude from only one side of the membrane D. Are comprised of 90% beta-sheet structures E. Contain only one hydrophobic segment