The enzyme required to attach the sticky ends of DNA and used when splicing DNA fragments into other DNA is ________.
A. helicase
B. ligase
C. endonuclease
D. reverse transcriptase
Answer: B
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The physiochemical conditions of a microenvironment, by definition, remain static
Indicate whether the statement is true or false.
The outbreak of measles within the last few years was due to
A. mutation of the virus. B. change in the environment. C. a decline in vaccination of children in the previous years. D. increase in sensitivity of detection techniques.
Sap rising in a tree in spring is best explained by
A. cohesion of water molecules B. increased transpiration C. the pressure-flow hypothesis D. chloroplast function
A scientific theory
A) is an educated guess. B) is a general explanation for natural phenomena. C) is less reliable than a hypothesis. D) will never be changed.