Cnidarians are __________, meaning they have two tissue layers
A. diploid
B. protostomes
C. diploblastic
D. bilateral
E. hermaphroditic
C
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A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (TMV). The cell contents are left in a covered test tube overnight
The next day this mixture is sprayed on tobacco plants. We expect that the plants would _____.A) develop some but not all of the symptoms of the TMV infection B) develop symptoms typically produced by viroids C) develop the typical symptoms of TMV infection D) not show any disease symptoms E) become infected, but the sap from these plants would be unable to infect other plants
Which of the following is a hormone that regulates the reabsorption of sodium by the distal convoluted tubules and collecting ducts?
A) angiotensin B) ANP C) ADH D) aldosterone
Nuclear division in which the chromosome number is reduced from 2n to n is part of the lifecycle of all of the following organisms except
A. Molds B. Ferns C. Insects D. Bacteria E. Protozoans
The deadliest infectious disease outbreak of all time happened over an 18-month period in 1918-1919. What disease caused this outbreak?
A. malaria B. AIDS C. tuberculosis D. influenza