Eukaryotic cells have their DNA enclosed in the _____
a. plasma membrane
b. nucleus
c. nucleoid
d. nuclear envelope
e. nucleotide
ANSWER: b
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The structure in the figure above represents a molecule of ____
a. pre-mRNA b. tRNA c. snRNA d. mRNA e. rRNA
Answer the following statements true (T) or false (F)
1.The earliest cells probably originated about 3.5 billion years ago. 2.The endosymbiont theory states that eukaryotic cells work together to form a multicellular organism. 3.The endoplasmic reticulum, Golgi apparatus, and other membranous organelles of cells might have formed by numerous infoldings of the cell's outer membrane. 4.The three periods of the Mesozoic era are the Triassic, Jurassic, and Cretaceous. 5.The two major extinctions of living species occurred during the Mesozoic era.
The major reason why there are fewer antiprotozoal drugs than antibacterial drugs is because ________.
A. antiprotozoal drugs cost much more than antibacterial drugs to develop B. antiprotozoal drugs are only effective when injected C. it is much more difficult to develop selectively toxic antiprotozoal drugs since protozoan cells are eukaryotic D. antiprotozoal drugs are not needed in the United States
What happened in 1973 when Gibbs, Young and Smith injected CCK into hungry rats? What hypothesis did it lead to?
What will be an ideal response?