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liberstina [14]
3 years ago
7

Which of the following statements is/are consistent with the fluid-mosaic model of membranes? (Select all that apply.) The lipid

bilayer and proteins exist side by side without covalent bonds between them. The membrane interior appears granular on an electron micrograph. Integral membrane proteins span the membrane. Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane. Carbohydrates are covalently bonded to the outside of the membrane. None of the Above
Biology
1 answer:
vfiekz [6]3 years ago
4 0

The correct answers are: The lipid bilayer and proteins exist side by side without covalent bonds between them and  Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane

According to fluid mosaic model, there is a lipid bilayer that gives fluidity and in which the protein molecules are embedded.  

The membrane is mosaic because there is a pattern of different types of molecules that are put together. Molecules are constantly moving in two dimensions.

Components of the cell membrane include:

• Phospholipids – Form a bilayer  

• Cholesterol –improves stability and reduce fluidity

• Proteins –integral (transmembrane) or peripheral  

• Sugars-usually attached to proteins.

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Chloride ions, Cl-, follow actively transported Na+ ions from the nephrons into the blood. Would you not expect the Cl- concentr
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Answer:

Bicarbonate ion, HCO3- (which has a similar charge to chloride ions) also follow sodium ions into the blood. Also, potassium ions, K+ are transported into the nephron so some chloride ions and bicarbonate ions remains in the nephron to balance the charge.

Explanation:

Sodium is the primary positively charged electrolyte in extracellular fluid. Most of the solute reabsorbed in the proximal tubule is in the form of sodium bicarbonate and sodium chloride. Water is also reabsorbed in order to balance osmotic pressure

When sodium ions are reabsorbed into the blood, few of the substances that are transported with Na+ on the membrane facing the lumen of the tubules include Cl- ions, Ca2+ ions, amino acids, and glucose. Sodium is actively exchanged for K+ using ATP on the basal membrane.

In the distal convoluted tubule, K+ and H+ ions are selectively secreted into the filtrate, while Na+, Cl-, and HCO3- ions are reabsorbed to maintain pH and electrolyte balance in the blood.

Some chloride ions remains in the nephron to balance the charge of the secreted K+ ions and also due to the bicarbonate ions that are removed.

5 0
2 years ago
Pure water is neutral. What is the appropriate justification for this? A. Water has equal H+ and OH- ions, making its pH 7, whic
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The correct solution for this is explained the first option. Since water has an equivalent amount or number of H ions and OH ions, pure water itself is not slightly acidic nor basic. This equality of ions, causes the pH of water to be around the mid point of the pH scale which goes from 0 - 14, and thus is 7. This is a neutral pH.
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3 years ago
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Carrying capacity could be reduced if each individual within the species consumed less from the environment. Think about humans: if every human needs a four car garage and a large house, the planet can sustain fewer humans than if each human lived in a studio apartment and traveled using a bicycle. It would take 1.75 Earths to sustain our current population. If current trends continue, we will reach 3 Earths by the year 2050. It is beyond dispute that the modern industrial world has been able to temporarily expand Earth's carrying capacity for our species. As Nordhaus points out, population has grown dramatically (from less than a billion in 1800 to 7.6 billion today), and so has per capita consumption. Historically, habitat and land use change have had the biggest impact on biodiversity in all ecosystems, but climate change and pollution are projected to increasingly affect all aspects of biodiversity. Sustainable agriculture practices support integrating biodiversity in various ways including in terms of diversity of crops, traditional agriculture techniques to control pests and increase productivity as well as ensuring that farmed land is made up of a diverse mix of grazing land, crop land, orchards, wetlands and more.

Explanation:

Hope this helps :)

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3 years ago
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