You have been given a plant sample and asked to identify a specific tissue. Upon investigation, you find the cells are all long in length and some of them have small pores. They all contain fluid. You test the fluid using various biochemical tests and discover the fluid contains an abundance of disaccharides. What type of tissue are you looking at?
A. Phloem
B. Meristematic
C. Sclerenchyma
D. Root hair cells
E. Xylem
Answer: A
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A major change in evolutionary patterns over long periods of time is best described as ____
a. macroevolution b. microevolution c. allopatric speciation d. directional selection e. sympatric speciation
Aspergillus and Penicillium are related because
both a. produce antibiotics. b. reproduce sexually using ascospores. c. are club fungi. d. parasitize human mucous membranes. e. lack known sexual stages
A researcher wants to produce antibodies by growing cells in the laboratory. What cell population would be necessary to accomplish this?
A) neutrophils B) monocytes C) red blood cells D) lymphocytes E) eosinophils
Sulfanilamide is an antimicrobial drug that mimics the shape of an important substrate for a particular bacterial enzyme, thereby inhibiting the enzyme. This type of inhibition is known as
A) allosteric inhibition. B) competitive inhibition. C) allosteric activation. D) noncompetitive inhibition. E) feedback inhibition.