The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it.
A: low; high; lac operator
B: high; low; lac operator
C: low; high; lac promoter
D: low; high; lac repressor
E: high; low; lac inducer
Answer: D: low; high; lac repressor
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A) cutting B) ripping C) grinding D) splitting E) piercing
The water activity in foods with high levels of salt or sugar is high
Indicate whether this statement is true or false
The sternum is a major site of red blood cell
formation. The bones in the sternum must be ___ bones.
a. compact b. spongy c. cartilaginous d. fibrous e. synovial
Which of the following techniques involves using tiny DNA-covered spheres of gold or other metals to deliver transgenes into plant or animal cells?
A) Retrovirus-mediated transfer B) Pronuclear microinjection C) Electroporation D) Gene gun E) Calcium chloride transformation