In a neuron at rest, the membrane is most permeable to
A. potassium.
B. sodium.
C. chloride.
D. calcium.
E. magnesium.
A. potassium.
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Which of the following statements regarding plants' ability to sense their environment is not true?
A. Photoreceptors allow plants to sense light availability. B. Plants have chemical receptors that allow them to detect and respond to chemical gradients. C. Plants have mechanical receptors that allow them to sense the Earth's gravitational field. D. Plants contain touch-sensitive genes that allow them to respond to wind. E. Plants have difficulty detecting temperature and so, rely on light wavelengths.
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
Imagine that NASA discovered a new planet with an atmosphere rich in hydrogen gas, hydrogen sulfide, ammonia and methane. We would call this a(n)
A. reducing atmosphere, because of the availability of hydrogen atoms that can donate electrons. B. reducing atmosphere because the atmosphere would reduce the energy necessary to build molecules. C. oxidizing atmosphere because of the availability of oxygen compounds. D. oxidizing atmosphere because of the lack of oxygen gas. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the reducing atmosphere of the early earth? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Phagocyte attachment to a pathogen is enhanced by a process known as 109)
A) opsonization. B) leukocytosis. C) chemotaxis. D) margination. E) diapedesis.