Which one of the following is false concerning viruses?
A. A virus is composed of a nucleic acid surrounded by a protein coat.
B. All viruses are parasites.
C. When a virus reproduces, it enters a host cell and directs it to synthesize copies of the invading virus.
D. A virus is the smallest type of cell.
D. A virus is the smallest type of cell.
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Which of the following organisms has a cell wall?
A. Entamoeba histolytica B. Candida albicans C. Trypanosoma cruzi D. Enterobius vermicularis
What kind of bond is formed between the 5? phosphate group of one nucleotide and the 3? hydroxyl (OH) group of the adjacent nucleotide?
A) ionic bond B) phosphodiester bond C) hydrogen bond D) disulfide bond E) hydroxyl bond
The epilimnion of a lake is located below the hypolimnion.
Answer the following statement true (T) or false (F)
A peanut farmer decides that she can make more money growing cotton and so plants her fields with cotton. The terrific yield of her fields is so encouraging that she continues to plant cotton for several more years, but each year her cotton yield
decreases. What advice could you give her to increase her yield? A) Use a little less fertilizer each year since the soil is becoming overfertilized. B) Plant peanuts in alternate years since this crop rotation will provide extra nitrogen to the soil. C) Leave the fields unplanted in alternate years so the soil can recover. D) Plant a different crop every year since different crops deplete different soil nutrients.