The cyclic nitrogenous base used in transcription, uracil, is a ________.
A. purine
B. porphyrin
C. protein
D. pyrimidine
Answer: D
Biology & Microbiology
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(a) double. (b) triple. (c) increase by 100 times. (d) stop.
Biology & Microbiology
All green algae _____
a. have a cell wall c. are multicellular b. are marine d. all of the above
Biology & Microbiology
What is the primary mechanism of carbon dioxide transport in blood?
A) bound to hemoglobin B) as bicarbonate dissolved in the red blood cells C) as bicarbonate dissolved in the plasma D) dissolved in the red blood cells E) dissolved in the plasma
Biology & Microbiology
Cell division occurs during the _____ stage
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology