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SOVA2 [1]
3 years ago
8

Uppose that you are studying an inducible operon that contains two genes required for the metabolism of compound xyz. gene a enc

odes enzyme a, and gene b encodes enzyme
b. when compound xyz is absent, the operon is repressed, but when compound xyz is present, the operon is induced.

Biology
1 answer:
gregori [183]3 years ago
6 0
The exercise tells you to complete the table showing different cases of mutation in different parts of the operon.

First, what is an operon?
An operon is a genetic unit of coordinated expression. It comprises a group of adjacent structural genes encoding the enzymes of the same metabolic pathway, as well as the regulatory sequences affecting the transcription of these structural genes (like operon lactose or tryptophan). It is composed by:Structural genes/cistrons: code for the enzymes participating in the same metabolic pathway, they are co-transcribed into a single polycistronic mRNA.• Promoter common to all structural genes: this is the binding site of RNA polymerase.• The operator: it is a regulatory sequence, it is the site of binding of the protein of the regulation, it controls the transcription of the gene downstream.• The regulatory gene: located upstream of the operon promoter, it encodes regulatory proteins capable of binding on the operator. He owns his own promoter.

*If a mutation touch one of the genes that the operon code for, this gene will be not functional
*If a mutation touches the operator none of the enzymes will be synthesized
*If a mutation touches a repressor (a molecule which inhibits the expression of the operon genes by binding specifically to the DNA at the operator level).

Based on this, the right answers are:
Mutant 1 ==> gene A
Mutant 2 ==> repressor
Mutant 3 ==> gene B
Mutant 4 ==> promoter

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Match each structure on the left with the corresponding function on the right. Group of answer choices Chemically digests food,
Ad libitum [116K]

Answer:

1. Chemically digests food, absorbs nutrients and minerals from food - Small intestine

2. Breaks down and physically digests food - Stomach

3. Metabolizes nutrients, detoxifies blood, makes bile - Liver

4. Stores and concentrates bile - Gallbladder

5. Removes waste products and excess fluid - Kidney

6. Filtering structure of kidney - Nephron

7. Produces eggs and reproductive hormones - Ovary

8. Produces sperm and reproductive hormone - Testis

Explanation:

This question is asking to correctly match certain digestive organs with their respective function. The organs and their function are as follows:

- Small intestine: Small intestine is the major organ that digests food chemically, and also absorbs nutrients and minerals from food.

- Stomach: This breaks down and physically digests food.

- Liver is responsible for metabolizing nutrients, detoxification of blood, and making of bile.

- Gall bladder is a greenish yellow organ responsible for the storage and concentration of the bile produced by the liver.

- Kidney is the major excretory organ of the body, which removes waste products and excess fluid from the body.

- Nephrons are numerous filtering structure of the kidney.

- Ovary is the female reproductive organ that produces the eggs/ova and other reproductive hormone like oestrogen.

- Testis is the male reproductive organ that produces the sperm and other reproductive hormone like testosterone etc.

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Answer:

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