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Bingel [31]
3 years ago
11

Even when lactose is available, the lac operon is not

Biology
1 answer:
Alja [10]3 years ago
5 0

Answer:

The E.coli bacteria utilize glucose and lactose as a substrate to produce various metabolites used to survive.

The bacteria use lac operon which represents a sequence of various genes aligned in a manner to use lactose as a substrate as the most favoured substrate is glucose.

The glucose metabolites regulate the transcription of the lactose operon as the presence of glucose prevent the production of cAMP which shuts off the lac operon even in the presence of the lactose.

When the glucose level is low in medium, the level of cAMP increase which binds with CAP and then activates the lac operon whereas when the glucose level is high, then the low level of cAMP does not activate the lac operon.

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In pea plants, tallness (T) is dominant to shortness (t). What is the predicted genotypic ratio of the offspring if a homozygous
Jlenok [28]
Hope this helped! This is called a punnett square, it calculates the percentages of phenotype outcomes. Some are more difficult than others, but this is pretty basic, just be sure to study about this.

7 0
3 years ago
Water in the diet can come from the foods that you eat, as well as liquid foods and beverages. The dietary reference intake for
Firdavs [7]

Answer:

a. Herbal tea  - Good source

b. Watermelon  - Good source

c. Ice cream  - Good source

d. Raisins  - Poor source

e. Whole wheat bread - Poor source

Explanation:

Water is an integral part of all activities and processes in the body including digestion and disposal. Eat more vegetables and fruits. The high water content contributes to your hydration. Around 20% of our fluid intake comes from foodstuffs

a. Herbal tea  - It is a good source of water as it is diuretic but still it does not offset hydration and counted as godd odurce of water.

b. Watermelon  - Watermelon are very good source of wateras they are is made up of 91% water.

c. Ice cream  - It is a goo dsource of water as it it made up of water, milk and fat. water i spresent in higher amount.

d. Raisins  - raisins are poor source of water as they are dried up and they loss the moisture content but can be a healthy source if consumed after soaking in water.

e. Whole wheat bread - it contains only 11% of water in each 100gm so it is not agood source of water and it acts as insoluble fiber.

4 0
4 years ago
In the 17th century many people in scientist believe spontaneous generation of life occurred what is spontaneous generation and
slega [8]
It was Francesco Redi<span> </span>
7 0
4 years ago
Phase II drug degradation reactions involves linking of conjugates to the drugs are ___
Sergio [31]

Answer:

Hi!

The answer is (C) Both (a) and (b)

Explanation:

Drug Metabolism:

  • Drug metabolism is divided into two steps: Phase 1 and Phase 2 reactions.
  • Phase 1 reactions involve the degradation or formation of functional groups.
  • Phase 2 reactions involve the conjugation of the drug or its Phase 1 intermediate with a polar conjugating molecule. Phase 2 generally performs the detoxification step in the drug degradation process.
  • Phase 2 or conjugation reactions are further divided into 2 types:
  • Type 1: Glucoronidation and sulfonation: An activated conjugating molecule such as glucoronic acid, sulfate or glutathione etc. is combined with the drug to form a conjugated molecule.
  • Type 2: Amino acid conjugation: An activated drug or substrate is conjugated with an amino acid such as glycine or glutamine.

Glutathione Conjugation:

Glutathione is a tripeptide found in most tissues, particularly in the liver. It performs important detoxification functions for all cells. The enzyme, glutathione S-transferase conjugates glutathione with drug intermediates to form a drug-glutathione conjugate. This conjugate can easily be excreted through bile or urine.

Amino acid Conjugation:

This is an important reaction in xenobiotic biotransformation; particularly for xenobiotics with carboxylic group or an aromatic hydroxylamine groups. Drug intermediates combine with glycine or glutamine to form an amino acid conjugate.

3 0
4 years ago
Answer the following questions about HIV-AIDS:
Sloan [31]

Answer:

Where do they occur: infected blood, semen or vaginal secretions in your body

How do they start: mainly by having s3x

How do they spread: either by s3x or injection drug use

How deadly are they: takes about 10 years for an injection to develop aids so idk a long time I guess? Just say very deadly

Is there a vaccine: not yet but people are working on some

Explanation:

5 0
3 years ago
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