Heavy metals such as silver, mercury and copper are effective antimicrobials due to their ability to bind to the regulatory site of enzymes, thus acting as an irreversible non-competitive inhibitor.
Indicate whether the statement is true or false
Answer: False
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The methanogenic archaeans are __________ that
pull electrons from __________. a. chemoautotrophs; oxygen b. chemoheterotrophs; carbon dioxide c. chemoautotrophs; water d. chemoheterotrophs; methane e. chemoautotrophs; hydrogen gas
The accompanying figure represents a chromosome at metaphase of mitosis. How many DNA molecules are present in this chromosome?
A) one B) two C) four D) more than four E) impossible to determine
How does Rb control the entry of the eukaryotic cell into the S phase?
What will be an ideal response?
Until the mid-1940s, many scientists considered proteins to be the likely candidates for the genetic material. Which of the following characteristics led scientist to believe DNA was NOT the genetic material?
A) DNA is less abundant than protein. B) DNA is less abundant than protein and DNA has less variation than protein. C) DNA is more stable than protein. D) DNA has less variation than protein. E) Protein can fold into may shapes.