In a double-blind experiment, ________
A) participants are randomly assigned to a control or experimental group
B) the participants are unaware of whether they are in the experimental or control groups because of the use of placebos
C) the researchers are unaware of which participants are in the experimental and control groups
D) All of the above are true.
D
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Archaea in the class ________ are thermoacidophiles that lack cell walls, but strengthen their plasma membranes with large quantities of caldarchaeol, glycoproteins, and lipid-containing polysaccharides.
A. Thermococci B. Pyrococci C. Thermoplasmata D. Archaeoglobus
Influential in the opening and closing of stomata.
Choose the letter of the best: A. abscisic acid B. auxin C. ethylene D. cytokinin E. gibberellin
The ________ of liquid water is created through the property of cohesion.
a. adhesion b. surface tension c. heat capacity d. temperature regulation
A source for alginic acid, a thickening, emulsifying agent found in ice cream, toothpaste, pudding and cosmetics, are the:
a. seed plants b. ferns c. brown algae d. red algae e. green algae