Cell–cell communication in plants takes place via specialized structures called
A) plasmodesmata.
B) chloroplast outer membrane pores.
C) gap junctions.
D) lipid rafts.
E) connexons.
Answer: A
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Which of the following statements is false?
a. Sensory receptors are able to detect specific stimuli only. b. Sensation is an awareness of a change in external or internal conditions. c. A stimulus will generate impulses that are different depending on where the signals are sent in the brain. d. Information about a stimulus is coded in the quantity and frequency of action potentials sent to the brain. e. Specific regions of the brain translate the information about the signal and convert it into a sensation.
You discover a mutant strain of Neurospora crassa that will not grow on a minimal medium but that will grow on a medium supplemented by the amino acid methionine
How can you determine which step in the methionine synthesis pathway is affected by the mutation?
Which of the following methods could be used to identify the source of an outbreak?
a. DNA fingerprinting b. reverse genetics c. production of a recombinant protein d. artificial selection
Up to 70% of travel-associated gastrointestinal diseases are caused by
A) Salmonella B) Enterotoxigenic strains of E. coli C) Shigella dysenteriae D) E. coli O157:H7 E) Enteroinvasive E. coli