Lipid rafts are associated with which of the following activities?
A) responding to extracellular signals
B) transport of nutrients across cell membranes
C) immune responses
D) transport of cholera toxin into cells
E) All of the above are correct.
Answer: E
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Molecules that are similar in sequence among distantly related organisms, such as many transcription factors important in development, are said to be evolutionarily conserved
A. true B. false
Which organism is catalase positive, coagulase negative, pyrrolidonyl arylamidase (PYR) positive, susceptible to novobiocin, urease negative, and hemolytic on sheep blood agar?
a. S. epidermidis b. S. saprophyticus c. S. cohnii d. S. haemolyticus
Placing a ripe apple with other apples that are not ripe will cause the other apples to ripen sooner
Which type of plant hormone is responsible for this effect?
a. brassinosteroids b. ethylene c. auxins d. oligosaccharins e. abscisic acid
Which of the following is probably a member of the Archaic humans, appearing around 600,000 years ago?
a. Au. sediba b. H. habilis c. H. erectus d. H. ergaster e. H. heidelbergensis