Which one of the following types of organisms has been most damaged by the influence of humans?
A. rats
B. corn
C. cockroaches D. apples
E. white rhinos
Answer: E
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What is one problem associated with using retroviruses as human gene therapy vectors?
A) Their random integration into the host chromosome may result in detrimental mutations. B) They need to integrate through an RNA intermediate. C) The level of proteins produced from them is usually very low. D) The level of proteins produced from them is usually very high.
The Archaea plasma membranes are made up of branched-chain hydrocarbons bounded to glycerol by:
a. hydrogen bonding. b. covalent bonding. c. polar bonding. d. ester linkages
e. ether linkagesWhat is the definition of an antigen?
A. a protein produced by plasma cells that attacks pathogens B. a type of white blood cell C. anything the immune system recognizes as foreign to the body D. a form of immune deficiency E. a part of the membrane attack complex of the complement system
Environmental pressures on a population, such as temperature and pH, are density ________ factors
Fill in the blank(s) with correct word