Which structures are restricted, causing an asthma attack?
a. Trachea
b. Bronchioles
c. Alveoli
d. Capillaries
Answer: b. Bronchioles
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Imagine that a cell has a genetic mutation so that the primase enzyme is unable to make RNA strands
Assuming that all of the other enzymes directly involved in DNA replication are still functional in these cells, how much of the process of DNA replication would you expect to see in these cells?
a. The leading strand would be synthesized, but not the lagging strand. b. None of it at all, no part of the DNA replication process could occur. c. The DNA helix would be unwound by helicase, but no new strands will be produced at all. d. Both the leading and lagging strand would be synthesized, but pieces of discontinuous strands would not be joined together. e. DNA replication would still proceed completely, since RNA strands are not part of the final product of DNA replication.
Which of the following statements about the herbicide atrazine is false? a. Atrazine is used for weed control, mostly in cornfields
b. Atrazine from agricultural runoff persists in soil and water for decades. c. Atrazine causes or contributes to frog deformities. d. Male frogs exposed to atrazine at levels below those allowed in drinking water develop ovary tissue.
In the equation, population growth = r × N, the letter r stands for ________
Fill in the blank(s) with correct word
In codominance,
A. the heterozygote exhibits the phenotypes of both parents equally B. there are always more than two alleles for a given character in a population C. the heterozygote is an intermediate phenotype between the parental phenotypes D. the two alleles affect more than one aspect of the phenotype