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4 years ago

Why are groups of small cells better than one large cell at moving material in and out?

Biology

1 answer:

Varvara68 [4.7K]4 years ago

4 0

Answer:

Explanation:

Smaller cells, with a larger surface area to volume ratio, are more efficient for diffusing materials in and out because, as a cell grows, the volume grows faster than the surface area.

-sorry if this doesn't help-

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Give two examples each for conduction, convection, and radiation that are not already mentioned in the content or activities in

klasskru [66]

Give two examples each for conduction, convection, and radiation.

Conduction - heating a tin can with the use of a bunsen burner, a cold iron skillet placed on a stovetop which is hot
Convection - boiling of water, hot air balloon
Radiation - UV from the sun, x-rays from an x-ray equipment

Find out whether combustion reactions are exothermic or endothermic, and explain why.
Combustion reactions are exothermic reactions since they always produce or release heat. The reactants would always have more energy than the products which causes the excess heat to be released.

<span>Find a substance that has a specific heat that is higher than liquid water and explain what it means.
The substance which has a higher heat capacity than water would be the hydrogen gas. It has a heat capacity of 13.83 kJ/kg K. Having a higher heat capacity would mean that it requires more heat energy in order to increase the temperature as compared to water.
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3 years ago

Read 2 more answers

Sort the phrases into the appropriate bins depending on whether they are true only for channels, true only for carrier proteins,

ehidna [41]

<h2>The correct answer is explained below:</h2>

Explanation:

The Plasma membrane of a cell is made up of a phospholipid bilayer which has a hydrophobic core and hence is impermeable to water soluble or polar organic and inorganic molecules.
However, a cell can maintain proper homeostsis and undergo metabolism only when it is able to exchange different hydrophilic and polar organic and inorganic chemical components present inside the cell with those present outside the cell.
This necessitates the development of a "path" that could connect the cell interior to the cell exterior.
The path is developed by integral membrane protein that spans across the lipid bilayer opening on either side of the membrane, thereby connecting the cell interior with the cell exterior.
These integral membrane proteins are amphipathic in nature, that is, they are composed of both polar and non-polar amino acid residues. The amino acid residues are arranged such that the non polar amino acid residues face and undergo hydrophobic interactions with the water avoiding lipid molecules in the plasma membrane. The polar amino acid residues face towards the lumen of the opening in between the cell interior and exterior such that they can form hydrogen bonding with the water soluble polar organic or inorganic molecules and help them traverse the plasma membrane.
These integral membrane proteins are of two types: Channel proteins and Carrier proteins.
The Channel proteins:

Form a direct and continuous opening across the plasma membrane. They can either remain always open or can be gated, that is, they open only on associating with specific signalling molecules.
They transport solutes from a region of high electrical charge or concentration to a region of low electrical charge or concentration, that is, down the electrochemical or concentration gradient.
They usually allow the easy and quick transport of water molecules and small ions across the membrane.

The Carrier proteins:

They undergo a change in their conformation to translocate solute molecules across the plasma membrane and they do not form a continuous opening.
When they open on one side of the membrane they are closed on the other side. They cannot remain, simultaneously, open on both sides of the membrane.
They are required mainly for the translocation of small polar organic molecules across the plasma membrane down the electrochemical or concentration gradient.

For channels only:

For carrier proteins only:

For channels as well as carrier proteins both:

4 0

4 years ago

Which of the following are examples of density independent limiting factors

Varvara68 [4.7K]

Answer:

food or nutrient limitation, pollutants in the environment, and climate extremes, including seasonal cycles such as monsoons.

Explanation:

5 0

3 years ago

If you put a pencil in a cup of water, it looks as if it is bent and larger in the water. This is because waves

son4ous [18]

Magnify things and enlarge and distort them

8 0

3 years ago

A radioactively labeled protein is made by cells and followed through various organelles in the secretory pathway. After six hou

kupik [55]

Answer:

The protein is targeted to Golgi apparatus.

Explanation:

Protein targeting or sorting is a process by which synthesized proteins are transported to their appropriate localizations in the cell or outside it. Proteins can be targeted to the inner space of an organelle (such as Golgi apparatus or endoplasmic reticulum) or its membrane, plasma membrane, or to exterior of the cell via secretion.

Usually, protein contains signal sequence on the N terminus that is involved in destination targeting.

5 0

3 years ago