What type of chemical reaction is involved in the conversion of cystine to cysteine?
A) addition
B) reduction
C) oxidation
D) substitution
B
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Argentina fire ants can be described by all of the following except:
a. They attack with painful and burning stings. b. They have killed humans, pets, and livestock. c. Some success in controlling the ants has been achieved with predatory flies. d. Native ant species help to keep them in check. e. They have spread throughout much of the southern United States.
What are sunspots? Why are they thought to have a possible effect on climate?
What will be an ideal response?
What is the average diameter of the head of a comet?
a. ?1-2 km b. ?less than 15 km c. ?50 km d. ?500 km e. ?2,500 km
Evaporation ________
A) is a heating process B) is a cooling process C) is a process not requiring energy D) releases latent heat in the air E) has its greatest rates when the air is already humid