The arabinose operon (ara) provides a particularly interesting example of _____ in that when arabinose is present in the environment, the operon is transcribed
A) positive control
B) negative control
C) push forward control
D) reverse transcription
E) positive translation
Answer: A
You might also like to view...
The nervous system can directly affect the activities of the digestive system locally through the collection of neurons within the walls along the gastointestinal tract. How might the brain exert its regulation of digestion from a distance?
_____ The sight, smell and taste of food can activate saliva production, stomach activity and digestion before it reaches the stomach. _____ The brain detects the stretching of the small intestines when food enters, and regulates the progress of chyme from the stomach into the intestine. _____ Muscular control of peristalsis resulting in mixing of food with digestive enzymes and moving food along the digestive tract. _____ Emotional stress or depression may alter appetite patterns.
Characteristics of mitochondria include that they ____
a. have two membranes, with the outer membrane being highly folded b. are least abundant in metabolically active cells c. does not require oxygen for its functioning d. function in photosynthesis e. have their own DNA and ribosomes and divide independently of the cell
The energy base on mud flats is:
a. phytoplankton. b. detritus. c. marsh plants. d. algae. e. chemosynthesis.
This image depicts the
1.steps of cellular growth.
2.steps by which HIV replicates inside a cell.
3.steps of bacterial infection.
4.difference between viral and cellular DNA.