Which of the following is not a conventional method for testing for antimicrobial susceptibility?
A) agar dilution
B) broth dilution
C) disk diffusion
D) Microscan titer plate
Ans: D) Microscan titer plate
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Which of the following organisms lack membrane bound organelles?
a. plants b. animals c. prokaryotes d. fungi
The earliest fossil records of bacteria-like organisms, dated at over 3 billion years, ________
A) are too spotty to allow us to trace lines of descent to present-day organisms B) unquestionably belong to cyanobacteria C) show that early cells had membranes made of short amino acid chains D) used only RNA molecules for both information storage and chemical catalysis E) already contained endosymbiotic organelles
You have a cube of modeling clay in your hands. Which of the following changes to the shape of this cube of clay will decrease its surface area relative to its volume?
A) Pinch the edges of the cube into small folds. B) Flatten the cube into a pancake shape. C) Round the clay up into a sphere. D) Stretch the cube into a long, shoebox shape.
Which of the following organisms is a keystone species in a tropical rain forest?
a. gray wolf b. fruit-eating bats c. poison arrow frogs d. fig trees e. fruit-eating monkeys