A pyrimidine is double-ring molecule
__________________Indicate whether the statement is true or false.
F, single
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Plant and animal development share a number of features, but differ in major ways. Which of the following is a key difference between plants and animals?
A) Animals typically produce gametes by meiosis; plants produce gametes by mitosis. B) Animal cells frequently undergo programmed cell death; plant cells do not. C) Animal development is controlled by regulatory gene sets such as Hox genes; plants have no similar control systems. D) Animal gametes are produced only after maturity is reached; plant gametes are produced throughout a plant's lifetime.
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
Collagen fibers are characteristic of which tissue?
a. muscle b. epithelial c. connective d. nervous e. embryonic
The spindle apparatus is composed of ____________________.
A. Golgi bodies B. microtubules C. endoplasmic reticulum D. nucleoprotein E. chromatids