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Margarita [4]
3 years ago
14

Cells lining the digestive tube are characteristic of this tissue category ____.

Biology
1 answer:
nataly862011 [7]3 years ago
8 0

Answer:

The correct answer is epithelial tissue.

Explanation:

There are mainly four types of tissue which is found in animals, muscle tissue, connective tissue, nervous tissue, and epithelial tissue. Epithelial tissue forms a membrane that covers the outer surface of organs, glands and also inner surface of body cavities.  

Epithelial tissue plays an important role in protection, absorption, secretion, excretion, and filtration. Epithelial tissue is of two type lining epithelium and glandular epithelium. Linning epithelium makes the cell lining of the digestive tube and other important organs. So the correct answer is epithelial tissue.

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Answer:

a. + glucose, + lactose  = On

b. - glucose, - lactose  = Off

c. + glucose, - lactose  = Off

d. - glucose, + lactose = On

Explanation:

Lac operon has both types of control, repressible and inducible.

Whenever glucose level is low in the cell, an enzyme known as adenylyl cyclase raises the level of cAMP which forms a dimer with CRP protein and they both act as activator of lac operon and cause expression.

Apart from this, when lactose is present in the cell, β-galactosidase enzyme metabolizes lactose to form allolactose which causes allosteric repulsion in the lac repressor and causes its removal from the operator. As soon as repressor is removed lac operon gets activated.

In wild type lac operons, the expression of lac operon occurs when glucose level is low in the cell and lactose is present but in this mutant presence or absence of glucose will not make a difference because CRP will bind Plac promoter independent of cAMP level i.e. activator CRP will work even in high glucose concentration. If lactose is present then lac operon will always express so in option 'a & d' lac operon will express but in option 'b & c' it will not express.

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Explain crop modifications in your own words.
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