Why is the mouth of a culture tube passed through the Bunsen burner flame after removing and before replacing the cap?
What will be an ideal response?
to prevent the entry of ambient air which might introduce contaminants
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What is a primary difference between polymerase chain reaction (PCR) and traditional cloning procedures such as those used to clone the human growth hormone gene?
A) PCR and traditional cloning make use of different types of bacteria. B) PCR and traditional cloning make use of different types of vectors. C) PCR uses plasmid vectors, whereas traditional cloning uses bacteria. D) PCR eliminates the need for restriction enzymes, vectors, and cells. E) PCR is more time-consuming, but the purity of the obtained DNA clone is much higher than in traditional cloning.
The surface of a plant root is called the ________.
What will be an ideal response?
fiber helps to prevent what
What will be an ideal response?
Albinism is due to the inability to make ________
A) collagen B) tyrosine C) melanin D) hair