Allergic reactions mainly involve
A. macrophages.
B. monocytes.
C. neutrophils.
D. mast cells.
D
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The ___________________ deals with geological processes and carbon reservoirs, some of which have been built up (or take place) over a period of millennia
In contrast, the __________ involves biological processes that are carried out on a daily and/or seasonal basis. A. short-term carbon cycle; long-term carbon cycle B. long-term carbon cycle; short-term carbon cycle C. short-term carbon cycle; rapid carbon cycle D. long-term carbon cycle; intermediate carbon cycle
Which PCR step causes the denaturation of double-stranded DNA?
A. Add primers. B. Heat target DNA to 94°C. C. Add DNA polymerase and nucleotides at 72°C. D. Repeat the cycle of heating and cooling. E. Cool DNA to between 50°C and 65°C.
Automated external defibrillators (AEDs) _____
a. are not as effective as CPR for starting a heart stopped by sudden cardiac arrest b. are not as effective as CCR for starting a heart stopped by sudden cardiac arrest c. require medical personnel to administer d. are not yet readily available in public places e. improve survival from sudden cardiac arrest
In many organelles, groups of different enzymes are located on membranes in close proximity to each other because
a. attaching enzymes to the membrane prevents the cell from losing them to the surrounding environment. b. when enzymes are in close proximity, each one can catalyze more than one type of reaction. c. these enzymes are involved in the same metabolic pathway and keeping them closer together increases the efficiency of the pathway. d. all enzymes must act in groups to position substrates in the proper orientation to produce the product.