Biology, 25.02.2020 21:26 dlo2457

Lipoproteins like LDL and HDL transport lipids and proteins through the blood stream. Receptors on cells can bind to the lipoproteins and remove them from the blood, using the lipids for energy and to produce membranes. Which of the following mechanisms would be used to move a lipoprotein into a cell?
A) Active transport
B) Facilitated diffusion
C) Receptor-mediated endocytosis
D) Endocytosis
E) Exocytosis

Answers: 2

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Answer from: florencemarti7331

The correct answer is: C) Receptor-mediated endocytosis.

Explanation:

Receptor-mediated endocytosis can be defined as the process in which when certain molecules or substances (lipoproteins) bind to their cognate receptors present on the surface of the cells, they are internalised into the cells by the inward protrusion of the plasma membrane into the cell followed by the pinching off of the membrane in the form of a vesicle.The vesicle contains the lipoproteins bound to the receptors.The lipoproteins are then targeted to the endosomes for recycling or other purposes.The endocytosis process is mediated by specific structural proteins called the clathrin which line the inner plasma membrane beneath the lipoprotein receptors. They help the plasma membrane to protrude into the cells and pinch off in the form of a vesicle.

Answer from: Quest

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.

Answer from: Quest

Advection fog occurs when warm air blows over a cold surface like snow and since tropical water is warm advection fog rarely forms over it

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Lipoproteins like LDL and HDL transport lipids and proteins through the blood stream. Receptors on c...