What is a ribozyme?

A. an RNA with enzymatic activity
B. an enzyme that synthesizes RNA primers during DNA replication
C. an enzyme that uses RNA as a substrate
D. an enzyme that catalyzes the association between the large and small ribosomal subunits
E. an enzyme that synthesizes RNA as part of the transcription process


Ans: A. an RNA with enzymatic activity

Biology & Microbiology

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At rest, a nerve cell has a high concentration of ____ inside and a high concentration of ____ outside

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Which of the following statements about radioisotopes is false?

a. The half-life of a radioisotope does not vary with temperature or pressure. b. Carbon-14 is typically used to date the rocks in which fossils are found. c. The ratio of carbon-14 to carbon-12 is used in dating fossils. d. Potassium-40 has an extremely long half-life. e. The nucleus of a radioisotope can change into that of a different element during decay

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What benefit are corticosteroids in the treatment of asthma?

A) They induce bronchoconstriction. B) They induce bronchodilation. C) They decrease mucus secretion into the airways. D) They increase blood flow to the airways. E) They reduce inflammation of the airways.

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Which of the following common epidemiological measurement is calculated by dividing the number of disease-related deaths within a specified period by the number of people with the disease?

A) Morbidity B) Mortality C) Incidence

Biology & Microbiology