A nail is inserted in the trunk of a tree ...

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will

(a) move downwards

(b) move upwards

(d) move sideways

Select your answer:

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Biotechnology and Genetic Engineering › View

What is a primer?

A. A long strand of RNA

B. A short segment of DNA that starts a new strand

C. An enzyme that cuts DNA

D. A protein that binds to DNA

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A new vaccine was developed and then tested on a large sample of individuals. This new vaccine will be considered effective if it helps prepare the body to fight future invasion by

A. inhibiting the response of red blood cells

B. stimulating the reproduction of microbes

C. inhibiting the action of immune cells

D. stimulating the production of antibodies