In an inducible operon, the ____ is the molecular switch that controls gene expression, while the ____ is the DNA region where RNA polymerase binds to begin transcription

a. repressor; inducer
b. inducer; repressor
c. operator; promoter
d. promoter; operator
e. lactose; promoter


a

Biology & Microbiology

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During ____ photosynthesis, H2S, H2, Fe2+ or AsO3 3 - can be oxidized

Fill in the blank with the appropriate word.

Biology & Microbiology

Which of the four major chemicals found in cells comprise telomeres?

A) Carbohydrates B) Lipids C) Proteins D) Nucleic acids

Biology & Microbiology

Explain the concept of homeostasis using the example of how we regulate our body temperature. What will be an ideal response?

Biology & Microbiology

Thalassemia is a recessive blood disease caused by reduced synthesis of one of the globin genes

While SCD is a mutation in the structure of hemoglobin, thalassemias can also be caused by mutations in the regulatory elements, causing too little globin to be produced and resulting in anemia. You've designed a DNA probe that you want to use to screen a family for a rare mutation in the ?-globin gene that causes thalassemia. First you will use the probe for northern blotting. What information will the northern blot tell you? A) whether the mRNA for ?-globin is being translated into functional proteins in a given cell population B) whether the amount of the ?-globin gene being transcribed (mRNA levels) is within normal range C) the size of the mRNA being transcribed D) the presence of a particular mutation by restriction fragment analysis E) both B and C are correct

Biology & Microbiology