Bacteriophages selectively infect bacterial cells. How might they be used as a therapeutic treatment in humans?
A. Bacteriophages can be used to genetically engineer bacterial cells making them more susceptible to drugs.
B. Phages can be used to stimulate human immune cells to attack and kill bacterial cells.
C. Phages can carry genes into cells which will genetically modify the host cells to prevent infection.
D. Humans suffering from infections with antibiotic resistant bacteria can be treated with phages, which will infect and lyse the bacterial cells, leaving human cells unaffected.
Answer: D
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A. beetles B. aphids C. ants D. scorpions E. biting flies
An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme extracted from cell culture. Both enzymes were examined and have identical amino acid composition. What is the best explanation for the lack of activity of the synthesized enzyme?
A) The van der Waals radius was altered during laboratory synthesis. B) The synthetic enzyme was not made of amino acids. C) The ATP required for self-assembly was present in the cell extract but not in the laboratory synthesis. D) Denaturation of the synthesized enzyme was not complete. E) The synthesized enzyme was not folded correctly because molecular chaperones were not present.
The lining of the cavity of the uterus is known as the ______.
A. myometrium B. follicle C. endometrium D. oviduct
In the food chain below, which population will most likely decrease if snakes are removed from the food chain? grass- > grasshopper -> frog -> snake -> hawk
A. grass B. grasshopper C. frog D. hawk