What is one benefit of normal flora in the large intestine?
A. They produce bile.
B. They absorb water.
C. They produce vitamin B.
D. They absorb fats.
E. They absorb iron.
Answer: C
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Point mutations in the hemagglutination (HA) or neuraminidase (NA) genes during viral ribonucleoprotein (RNP) replication give rise to new strains. This mechanism is known as the antigenic:
a. drift. b. shift. c. re-assortment. d. modification.
The first, innermost energy shell of an atom
A. can have a maximum of 8 electrons. B. can have a maximum of 2 electrons. C. is called the 2p orbital. D. is called the 1s orbital and can have a maximum of 8 electrons. E. is called the 2p orbital and can have a maximum of 2 electrons.
Red algae ____
a. are primarily marine organisms b. are thought to have developed from green algae c. contain xanthophylls as their main accessory pigments d. are mostly unicellular e. survive only in shallow water
Splicing together DNA from two different organisms is known as:
a. bioengineering. b. in vitro gene technology. c. genome technology. d. recombinant DNA technology. e. DNA sequencing.