Protection Mechanism IV: genetic
What will be an ideal response?
•Nitrogenase production has multiple environmental checks.
•When [NH4] is low, nitrogenase operon get turned on in a two-step process.
•When [NH4] is high, nif genes do not get transcribed.
•When [O2] is high, NifA gets complexed and nitrogenase operon is turned off.
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In which situation would a bacterium most likely have cytoplasmic inclusions?
A. When the cell is synthesizing flagella B. When the cell is starved for nutrients C. In a habitat abundant in nutrients D. When producing an endospore
Why is it important that the glycerol heads of the cell membrane be facing toward the extracellular and intracellular environment?
a. They are hydrophilic. b. They are hydrophobic. c. They have both hydrophilic and hydrophobic properties. d. They have neither hydrophilic or hydrophobic properties.
Allergies occur when the body responds to _____
a. pathogens c. normally harmless substances b. toxins d. all of these
Which of the following statements about Figure 7-1 is true?
a. The reactants have more free energy than the products.
b. The products have more free energy than the reactants.
c. The figure represents a spontaneous reaction.
d. The figure represents an endergonic reaction.
e. The reaction is endergonic, and also the products have more free energy than the reactants.