A biological membrane is selectively permeable in that it can, to some extent,control which substances pass through it. Based ont he information provided in Book 5, describe the general structure of a biological membrane making particular reference to the signiﬁcance of the hydrophobic and hydrophilic properties of the major biological molecule component of membranes.Explain how this membranes tructure results in the essential property of semi-permeability. Your answer should include a brief, simple explanation of the term diffusion in the context of cell membranes.Could anyone give me an idea how to answer this question?
Thank you!

Answers

Answer 1

Answer:

Cell membranes are composed of what we call a "phospholipid bilayer" composed of phospholipids. Phospholipids have a hydrophillic (‘water loving’) head and a hydrophobic (‘water fearing’) tail. Water can get close to the hydrophillic head while it cannot pass through the hydrophobic tail, thus protecting the cell from foreign substances it does not need. Because of this dual property, the membrane can choose what substances may enter through it and this is what constitutes its semi-permeability.

One of the ways substances can enter through the membrane is through passive transport or diffusion, the movement of substances from higher concentration to lower concentration. This process does not require energy. Substances like oxygen and water easily diffuse through channel proteins when the concentration outside the cell is higher than the inside.

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What does stirring do in an experiment

Answers

It mixes all the chemicals in the expiment together. But it can also ruin an experiment depending on what type of experiment you are doing.

All organisms begin life as a ____________ cell. /7730779/d6d734b2?utm_source=registration

Answers

Single cell

is the answer, hugss !

All organisms begin life as a single cell.

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Identify the literary device employed in the following sentence from Herman Melville’s short story "Bartleby, the Scrivener".And here Bartleby makes his home, sole spectator of a solitude which he has seen all populous—a sort of innocent and transformed Marius brooding among the ruins of Carthage!
A) allegory
B) irony
C) allusion
D) symbolism

Answers

The correct answer for the given statement above would be option C. The literary device employed in the given sentence from Herman Melville's short story "Bartleby, the Scrivener" is allusion. Allusion is a figurative language which uses an expression to briefly or indirectly refer to a person, place, thing, event, idea or political significance.

The correct answer for the given statement above would be option C.

What is allusion device?

As a literary device, allusion allows a writer to compress a great deal of meaning and significance into a word or phrase.

Allusion is a literary trick used in the following passage from Herman Melville's short story "Bartleby, the Scrivener." Allusion is a figurative language in which an expression is used to refer to a person, place, thing, event, idea, or political significance in a brief or indirect manner.

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Pathogens can be transmitted through contact with surfaces like doorknobs and countertops.a. True
b. False

Answers

The answer is a. True.

Some pathogens can be transmitted through direct contact with infected person, and some pathogens can be spread through contact with surfaces like doorknobs and countertops. For example, an infected person can touch these surfaces and leave behind pathogens. When an uninfected person touches the surfaces and then touches its skin, the pathogens are transmitted to that person. Staphylococci are the commonly transmitted this way.

Answer:

True

Explanation:

What happens if both sister chromatids move to the same pole

Answers

Although many cells go through both anaphase A and B motions, occasionally one motion takes precedence over the other. Poleward migration in anaphase requires the separation of the paired sister chromatids. The components that link the chromatids at the centromere are degraded by proteolysis, which causes chromatid separation.

What both sister chromatids move to the same pole?

Synapsis is the name given to this action. Crossing over happens during synapsis. DNA is transferred between two nonsister chromatids of a homologous pair of chromosomes during crossing over.

When nondisjunction occurs, the homologous or sister chromatids are drawn to one pole of the cell because the separation does not take place.

Therefore, One daughter cell would have more chromosomes than usual, and one sister chromatid would not split equally during the anaphase of mitosis.

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You end up with two cells with aneuploidy, or abnormal chromosome number. One daughter cell will have one extra chromosome, the other daughter cell will have one less than what it should have. For example, if the normal number is 46, and this happened, you would end up with one cell with 45 and one cell with 47.

Why didnt the present shapes of the continents fit perfectly into a supercontinent

Answers

The borders (coastlines) of the continents underwent a number of changes since the split. Often, chunks of land were washed away with water, slowly or in bigger portions. The coast was generally "smoothed" by the ocean currents too, and in some places more land was added with the material that the ocean currents brought.

Then, the tectonic plates continue to move, so this adds to the changes of the shape of the continents.

Answer:

because of erosion and the shifting of tectonics places ver slowly and continuolsy changes the shape of the land

Explanation:

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