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12 Dec 2019

true or false. if bacteria breaks down lactose into glucose and galactose, compartment 6 will turn yellow

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Beverley Smith
Beverley SmithLv2
13 Dec 2019
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Related questions

Glucose and galactose are components of many disaccharides,oliogsaccharides, and polysaccharides. Sort these commoncarbohydrates to indicate if they contain glucose, galactose, orboth.

Items (6 items) (Drag and drop into the appropriate areabelow)

  • Lacto-N-tetraose
  • Maltose
  • Raffinose
  • Starch
  • Sucrose
  • Lactose

In the following points, I have summarized Lac operon in Ecoli. I need to check if this is on the right track? and where does 'cleavage of disaccharides' fit into this picture?

Lactose is a disaccharide and the bacteria need specific genes to manage catabolism

1) The lacl promotor gene synthesis the repressor protein which binds to the operator gene stopping the RNA polymerase from coding the lac operon genes

2)But when lactose is present, it needs the specific genes to catabolise lactose

3) So, When allolactose (a derivative of lactose)is present, it binds to the repressor protein, the repressor releases from the operator gene

4) This allows the RNA polymerase can attach to the DNA control region

5) And drive down the operon for transcription and induction of the enzyme lacZ(beta-galactosidase) lacY and lacA which breaks lactose down into glucose and galactose

6) When the lactose is all gone, the repressor returns to the operator in a feedback loop system

1. Which three are all monosaccharides? A. fructose, galactose, lactose B. maltose, sucrose, lactose C. glucose, fructose, sucrose D. glucose, fructose, galactose

2. What is the relative amount of carbohydrate digestion that takes place in the mouth, the stomach and the small intestine? A. Mouth: a little Stomach: none Small intestine: most B. Mouth: none Stomach: a little Small intestine: most C. Mouth: most Stomach: a little Small intestine: none D. Mouth: none Stomach: most Small intestine: a little

3. Many adults are lactose intolerant. What causes this? A. Lactose provokes an autoimmune response that irritates their intestinal lining. B. They break down and absorb lactose, thereby depriving the bacteria in the colon of lactose as an energy source. C. They can't break down and absorb lactose, so the bacteria in their colon digest the lactose instead. D. Lactose binds to the cells of their intestinal wall, blocking the absorption of other nutrients.

4. Compared with animal fats, in general, vegetable oils contain a higher proportion of A. unsaturated fatty acids. B. cholesterol. C. trans-fatty acids. D. saturated fatty acids.

5. Trans fatty acids are found in A. all plant fats/oils. B. all fats/oils. C. all animal fats. D. hydrogenated oils.

6. Cholesterol made in the liver travels to body cells in A. Micelles B. High density lipoproteins (HDLs) C. Low density lipoproteins (LDLs) D. Chylomicrons

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