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2 years ago

According to the induced fit hypothesis of enzyme catalysis, which if the following is correct?

Biology

1 answer:

rodikova [14]2 years ago

7 0

Answer:

the binding of the substrate changes the shape of the enzyme's active site

Explanation:

According to induced fit theory, binding of substrate to the active site of the enzyme causes a conformational change in enzyme. This is referred to as the induced-fit mechanism and was postulated by Daniel Koshland in 1958. The induced fit brings specific functional groups on the active site of the enzyme into the proper position to catalyze the reaction and thereby enhances the catalytic activity of the enzyme. The induced conformational change facilitates the formation of additional weak interactions in the transition state.

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Drag each tile to the correct box. Explain the process in which hormones secreted by the pancreas function with respect to incre

olga55 [171]

Answer:

The correct order is:

High amount of glucose in the blood, sending signals toward the pancreas.
Synthesis of hormones by beta cells.
Binding of hormones with receptors on the liver.
Intake of glucose molecules from the blood by specific transporters.
Release of hormones from the receptors

Explanation:

The pancreas produces two hormones important for the regulation of blood glucose levels.
The two hormones, glucagon and insulin, increase and decrease the blood sugar respectively.
Insulin lowers the blood glucose by stimulating the body cells to increase the intake of glucose.
The brain senses high/low blood glucose, then, sends signals to the pancreas to initiate the synthesis of insulin or glucagon by the beta cells.
These hormones bind to receptors on body cells; on hepatic cells, in case of insulin.
The receptors initiate cellular signaling that facilitates intake or exit of glucose in or out of body cells.

4 0

2 years ago

Read 2 more answers

The primary germ layer that gives rise to the mucosae and associated glands is the ________.

lisabon 2012 [21]

The primary germ layer that gives rise to the mucosae and associated glands is the endoderm.

6 0

2 years ago

Choose a plant or animal that you think is interesting. describe some of the threats or challenges

Natasha_Volkova [10]

Answer:

If I were to choose a plant or animal which is interesting, I'd choose the "cactus."

Explanation:

A "cactus" is truly a splendid plant owing to its ability to survive in the desert or periods of drought. Growing them is also not that challenging or difficult. However, this plant is prone to certain threats that may lead to its extinction.

One of these threats is the "over-collection of cacti." Due to its versatile use, the cactus is often sold as an ornamental plant.
Another threat is the number of pests, such as snails and slugs, that attacks it yearly. It is a delicious food for mealy bugs, red spider mites, gnats, flies, etc.
People often misunderstand the cactus' water level needs. Some people over-water the plant and this often results to the bacteria, virus and fungi being attracted to it.

8 0

2 years ago

List the functions of proteins in the text area below.

Anuta_ua [19.1K]

Proteins participate at almost all levels of cellular processes among their main functions:

1- Maintenance of oncotic pressure: prot. are macromolecules that hydrate in the plasma and exert a PO retaining water in the vascular medium, all prot. mainly albumin

2- Buffer role: all prot. Plasma acts as a buffer because of their hydrophobic character thus participating in the regulation of acid-base balance

3- Transport function Albumin.Tyroxine binding protein (TBP), transferrin, apoproteins..etc.

4- Enzymes and coenzymes: renin, orosomucoid (coenzymes of LPL)

5- Role in coagulation and fibrinolysis: fibrinogen, thrombin. antithrombin

6- Role in immunity: Ig (lgA JgG.lgM) and complement proteins

7- Role in the allergic: IgE and complement fractions

8- Role in inflammation: α1 antitrypsin, orosomucoides .cerulioplasmin, cytokines, CRP

9- Hormonal role: insulin, glucagon, pituitary stimulins (TSH, FSH, LH)

10- And finally a structural role (such as actin or tubulin that participate in the architecture of the cell, the keratin that makes up the hair);

3 0

2 years ago

Read 2 more answers

In the electron transport system

antoniya [11.8K]

Answer:

A. NADH and FADH2 both donate electrons at the same location.

Explanation:

In the respiratory chain, four large protein complexes inserted into the mitochondrial inner membrane transport NADH and FADH₂ electrons (formed in glycolysis and the Krebs cycle) to oxygen gas, reducing them to NAD⁺ and FAD, respectively.

These electrons have great affinity for oxygen gas and, when combined with it, reduce it to water molecules at the end of the reaction.

Oxygen gas effectively participates in cellular respiration at this stage, so its absence would imply interruption of the process.

NADH and FADH₂ electrons, when attracted to oxygen, travel a path through protein complexes, releasing energy in this process.

The energy released by the NADH and FADH₂ electrons in the respiratory chain in theory yields 34 ATP, however, under normal conditions an average of 26 ATP molecules is formed.

If we consider that these 26 molecules are added to the two ATP formed in glycolysis and two ATP formed in the Krebs cycle, it can be said that cellular respiration reaches a maximum yield of 30 ATP per glucose molecule, although theoretically this number was 38 ATP per glucose molecule.

5 0

2 years ago