Any organism that causes disease is classified as a(n)
a. fomite.
b. biological vector.
c. mechanical vector.
d. pathogen
e. antigen.
D
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You a given a plant tissue in lab and asked to determine if the tissue is a source or a sink. Microscopic analysis reveals an abundance of colorless parenchyma cells with plastids. Only one biochemical test reacts positively with your sample. In the presence of iodine, the plastids turn a dark purplish color. Based on this information you determine your sample is
A. a source because your sample is rich in carbohydrates. B. a source because your sample contains plastids. C. a sink because your sample is rich in carbohydrates. D. both a source and sink because it contains both plastids and carbohydrates. Clarify Question What is the key concept addressed by the question? What type of thinking is required? What key words does the question contain and what do they mean? Gather Content What do you already know about the function of a sink in a plant? How does it relate to the question? Consider Possibilities What other information is related to the question? Which information is most useful? 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?
When cells of the vascular cambium divide, they produce xylem toward the outside
____________________ Indicate whether the statement is true or false.
Dr. Askins performs an electrophysiology experiment. She records a neuron firing an action potential. What voltage
does she record during each action potential spike? a. -70 mV b. -55 mV c. +35 mV
d. +55 mV e. +70 mV
Which type of bacteria grows in either the presence or the absence of oxygen?
a. obligate aerobes and obligate anaerobes b. facultative anaerobes only c. obligate anaerobes and facultative anaerobes d. obligate anaerobes only