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4 years ago

How does a selectively permeable membrane affect diffusion?

Biology

1 answer:

Mrrafil [7]4 years ago

8 0

Answer:

- Only some molecules move from a higher concentration to a lower concentration.

Explanation:

Selective permeability of the membrane means that membrane regulates which molecules (ions, substances) and how much of them can pass through it. Permeabilty of the membrane is determinated by its structure (hydrophobic heads and hydrophilic tails, cholesterol), temperature

The simplest form of transport through membrane is diffusion, passive transport of the molecule down its concentration gradient 9from higher to lower concentration). Some molecules can move down their concentration gradients directly, some have to pass through membrane proteins in a process called facilitated diffusion while others require energy and use active transport.

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When a cell containing an endospore (such as Bacillus subtilis) is stained with the Gram's method, the cell is stained but the e

Liula [17]

Answer:

Endospores Staining

Endospores are substances that are formed inside of specific bacterial cells which boost their survival rate in times of harsh conditions.

Gram staining alone is not sufficient to observe the endospores, which seems apparently clear when Gram-stained cells are observed.

Endospore staining employs two stains to identify endospores from other cell components.

•The Schaeffer-Fulton method employs heat to promote the primary stain (malachite green) into the endospore. Rinsing with water will well wash away the colour from the cell, as the endospore still appears to be green stained. Counterstaining pink with safranin will show the shape and location of endospores, if they are a part of the cell. The green endospores will be seen inside the pink vegetative cells or it will appear distinct from the pink cells in total. If no endospores are seen, only the pink vegetative cells will be observable.

The attached image shows a stained preparation of Bacillus subtilis revealing the endospores as green and its vegetative cells in pink coloration.

Endospore-staining procedures are essential for observing Bacillus and Clostridium, two genera of endospore-forming bacteria, production of bioterrorism agent from B. anthracis (which causes anthrax.

7 0

3 years ago

The common grackle is a species of robin-sized blackbirds that are common (hence the name) over most of the United States. Long

omeli [17]

Answer:

Explanation :

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3 0

3 years ago

How do organs work together to form specific functions

lesya692 [45]

Answer:

Sistemas orgánicos

Explanation:

Aunque cada órgano del cuerpo realiza sus funciones específicas, los órganos también funcionan juntos por grupos, a los que se denomina sistemas orgánicos (ver Principales sistemas orgánicos). Los médicos clasifican las enfermedades y sus propias especialidades médicas de acuerdo a los diferentes sistemas orgánicos.

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2 years ago

Explain and give an example of and organism that can have 2 symbiosis relationships

notsponge [240]

Answer:

lichens

mycorrhiza

Explanation:

Lichens are formed by two types of organisms- an alga and fungus. The mycelium of the fungus forms athin mat which offers anchorage and protection to some microscopic algae. The alga provides the fungus with sugars which it produces through photosynthesis.

Mycorrhiza is a type of symbiotic relationship between a saprophytic fungus and vascular plants such as coniferous trees. The fungus develops in the soil near the base of the tree. Some of the hyphae penetrate into the outer layers into the soil from which it obtains mineral ions. It also decomposes proteins to their amino acids. The fungus shares these nutrients with its tree host.

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4 years ago

When air gets warm does it sink or rise?

stiv31 [10]

Air rises when it is warmer

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3 years ago