Not all human activities contribute to heating of the atmosphere. Which of the following has a net effect favoring atmospheric cooling?
A) production of CO2
B) production of methane, nitrogen oxides, and chlorinated hydrocarbons
C) production of ozone
D) effects on albedo of the earth's surface
E) all of the above
Ans: D) effects on albedo of the earth's surface
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Answer the following statements true (T) or false (F)
1. If a cell contains 20 chromosomes in G1, it will contain 40 chromosomes at the end of S. 2. During prometaphase, the sister chromatids organize into a single row in the center of the cell. 3. A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid. 4. One major difference between metaphase I and metaphase II is the presence or absence of bivalents.
An individual with a genetic makeup of aa BB is
called a. pure-breeding. b. recessive. c. hybrid. d. dihybrid. e. heterozygous.
Ciprofloxacin is used to treat viral respiratory infections.
Answer the following statement true (T) or false (F)
A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called ________ culture system.
A. semicontinuous B. fed-batch C. continuous D. batch