Which of these metals have antimicrobial properties associated with them?
A. Tin
B. Gold
C. Silver
D. Aluminum
E. both silver and gold
Answer: E
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The potential seventh mass extinction refers to ____
a. the loss of 50% of species on Earth, including dinosaurs, at the end of the Cretaceous b. the most extensive loss of species that occurred during the Permian c. what will happen to the human species if a nuclear war occurs d. the rapid loss of biodiversity due to human degradation of the environment e. events that occurred just before insects diversified on land
How are humans able to produce billions of unique B and T cell receptors?
a. Each time a pathogen is encountered, a new receptor is produced. b. The two different genes that encode receptor proteins, allow for many versions of receptors to be produced. c. Random splicing of gene segments encoding receptor proteins allows for 2.5 billion potential combinations. d. Antigen presenting cells stimulate B and T cells to each produce billions of receptor molecules. e. There are billions of B and T cells, each of which produces a single receptor on its cell surface.
The actions of insulin and glucagon are
a. synergistic. b. antagonistic. c. cooperative. d. permissive. e. mutualistic.
Which enzyme is used to generate compatible sticky ends in order to join a desired gene to a plasmid vector in recombinant DNA techniques?
A) restriction enzymes B) DNA ligase C) reverse transcriptase D) Taq polymerase E) CRISPR-Cas9