Which one of the following initiates signal termination?
A. the shutdown of transcription
B. the release of signal molecules from their
receptors
C. the shutdown of translation
D. the reduction of signal amplification
B
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Nitrogen has a higher electronegativity than hydrogen. As a result you would expect that ammonia (NH3 ) molecules can form ____ with each other.
A. ionic bonds B. hydrophilic bonds C. hydrogen bonds D. cohesive bonds E. covalent bonds
Most cells are small. When they reach a certain size, cells typically divide. This has to do with the
a. amount of genetic material. b. surface-to-volume ratio. c. inability to produce more components of the cell membrane. d. fact that they cannot possess sufficient numbers of organelles for normal cell functioning. e. differences between viral particles and eukaryotic cells.
Adventitious shoots that sprout from shallow lateral roots are called ____
a. grafts b. pericyle extensions c. stem fragments d. cuttings e. suckers
All of the following are correct about the autoclave, except
A. the duration of the process depends on how full the chamber is. B. it is the temperature that kills the microbes, not the pressure by itself. C. it is important not to overload the chamber. D. it is effective for sterilizing powders, oils, and waxy substances. E. sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures.