Which of the following dominates the process of
transcription?
a. RNA polymerase
b. DNA polymerase
c. phenylketonuria
d. transfer RNA
e. all of these
Answer: a
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Greenhouse gases block
A. carbon dioxide molecules escape from Earth. B. heat escape from Earth. C. oxygen molecules escape from Earth. D. UV wavelengths escape from Earth. E. UV wavelengths from reaching Earth's surface.
During swallowing, which event prevents food from entering the trachea?
a. movement of the tongue b. holding of the bolus of food between the cheek and gums c. depression of the epiglottis d. peristalsis of the esophagus e. secretion of mucus
Extracts of pathogenic bacteria can transform harmless bacteria to harmful bacteria unless ____ enzymes are added to the extract.
A. protein transfer B. mRNA-degrading C. tRNA-degrading D. DNA-degrading E. nucleic transfer
Using a microscope in the science lab, Jill observed two unknown cells: Cell 1 and Cell 2. Cell 1 she identified as a plant cell and Cell 2 as an animal cell. Her teacher told her she identified the cells correctly. What did Jill most likely observe to correctly identify the cells?
A. Cell 2 had a cell membrane and Cell 1 did not. B. Cell 1 had a cell wall and Cell 2 did not. C. Cell 2 had a chloroplast and Cell 1 did not. D. Cell 1 had a nucleus and Cell 2 did not.