Which animals use positive pressure breathing to ventilate their lungs?
a. reptiles
b. birds
c. dogs
d. frogs
Answer: d. frogs
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The type of filter used in a laminar flow biological safety cabinet is called a(n) ________ filter.
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Milk is a type of protein; thus, the building blocks for this macromolecule are __________
a. glucose molecules b. amino acids c. hydrogen bonds d. lipids
Why would migration to an island by a single pair of birds be likely to lead to adaptive radiation in their descendants?
What will be an ideal response?
What is the first step during transcription initiation in prokaryotes?
A. RNA polymerase binds to the promoter. B. The transcription bubble is formed. C. Transcription factors bind to the TATA box sequence. D. The DNA double helix is unwound. E. RNA polymerase synthesizes a short primer.