How large is the human genome?
A) 3 million base pairs
B) 1 trillion base pairs
C) 3.2 billion base pairs
D) 1 million base pairs
E) 10 billion base pairs
Answer: C
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What will be an ideal response?Foods can be preserved in many ways by slowing or preventing bacterial growth. Which of these methods should be LEAST effective at inhibiting bacterial growth?
A) Refrigeration: slows bacterial metabolism and growth. B) Closing previously opened containers: prevents more bacteria from entering, and excludes oxygen. C) Pickling: creates a pH at which most bacterial enzymes cannot function. D) Canning in heavy sugar syrup: creates osmotic conditions that remove water from most bacterial cells.
Which of the following is/are used for osmoregulation and excretion in all but the simplest animals?
a. modifications of the respiratory and digestive systems b. the lining of the digestive tract c. the transport epithelium d. specialized blood vessels
There are ________ different described species of fungi.
A. 550 B. 74,000 C. 2,000 D. 4 million