Flatworms have specialized cells called ____ that serve as a simple excretory system
a. choanocytes
b. polyps
c. cnidocytes
d. flame cells
e. tentacles
D
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What is the purpose of synthesizing a negative strand RNA in positive stranded ssRNA viruses?
A) enable rolling circle amplification of the genome, which requires both strands of RNA B) enable transcription of genes occurring on both the negative and positive strands of the genome, such as overlapping genes C) proofreading of the genome to minimize mutations generated by the polymerase being passed onto virion progeny D) to serve as the complementary template sequence in genome amplification of the positive strand
In specific resistance, if the plant does not have an R protein, which of the following will happen when it comes into contact with a pathogen?
A. The AVR proteins of the virus will not be able to bind and the plant will not become infected. B. The AVR protein will block the plant's basal resistance, allowing the pathogen to infect the cell. C. The AVR protein will activate the plant's defensive genes. D. The AVR protein will bind to a receptor in the plant cell's membrane and a general defense response will be triggered. E. The pathogen will not make AVR proteins if the plant cell lacks the R protein.
What feature of a dinosaur determines whether it is a saurischian or an ornithischian dinosaur?
a. size b. habitat c. feeding preference d. pelvic bone structure e. number of feet it walks on
Which of the following is insoluble in water?
A) DNA B) Salt C) Sucrose D) Amino acids E) Olive oil