Thermococcus litoralis and Thermus aquaticus are thermophilic bacteria that are
A. used as cloning vectors.
B. genetically engineered bacteria.
C. sources of heat-stable DNA polymerases.
D. principal sources of restriction endonucleases.
Answer: C
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Scientists believe that stimulating growth of algae and other organisms can reduce carbon dioxide amounts in the atmosphere. Where is carbon dioxide consumed in a plant cell?
A. Matrix in mitochondria B. Cellulose in cell wall C. Stroma in chloroplasts D. Number of amyloplasts E. Central vacuole
Avery, McLeod, and McCarty continued Griffith’s work with S. pneumoniae and concluded from their
experiments that DNA was the hereditary material. What would happen to mice after injection of heatkilled virulent bacteria mixed with live avirulent bacteria after treatment with proteinase if protein was the hereditary material instead of DNA?
a. the mice would live b. the mice would die c. the mice would get sick but recover d. the mice would grow tumors e. the mice would degrade the protein
Mature red blood cells have no nucleus or mitochondria
Indicate whether the statement is true or false
where in plants does
1.photosynthesis occur? 2.gas exchange (O2 CO2)