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3 years ago

Choose the CORRECT statement concerning the cell membrane lipid molecules

Biology

1 answer:

VashaNatasha [74]3 years ago

6 0

Answer:

The correct statement concerning the cell membrane lipid molecules is that "energy is not expended during diffusion" (Option d)

Explanation:

Biological membranes are formed by two lipidic layers arranged with their hydrophilic polar heads facing the exterior and the interior of the cells, and their hydrophobic tails against each other. Membranes are fluid, which means that molecules that form it have the capability to move through it.

Lipids can easily change places with other neighbor lipids by <u>lateral diffusion</u> in the same layer. This is passive diffusion, which means that it does not need energy to happen.

Lipids can also diffuse transversally to the other layer, but this kind of movement is not as easy as lateral diffusion.

There are also other lipidic movements as rotational diffusion that imply the rotation of the molecule.

Through this lipidic bilayer, there is also a passive transport of some particles from one side of the cell to the other which happens because of concentration differences.

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What is the hardy weinberg symbol for the dominant allele

soldier1979 [14.2K]

Answer:

The Hardy Weinberg symbol for the dominant allele is 'p' in his equilibrium equation.

Explanation:

The equation given by Hardy: " $\bold{p^{2}+2 p q+q^{2}=1}$ " is known as "Hardy-Weinberg equilibrium equation".
The frequency of dominant allele and recessive allele for a trait is represented by 'p' and 'q' respectively.
2pq in the equation is the frequency for heterozygous genotype.

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3 years ago

Which process produces human egg and sperm cells?

Novay_Z [31]

Gametogenesis, the production of sperm and eggs, involves the process of meiosis. During meiosis, two nuclear divisions separate the paired chromosomes in the nucleus and then separate the chromatids that were made during an earlier stage of the cell's life cycle.

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3 years ago

When crude oil is distilled, it is separated into categories. What are those categories characterized by?

goldfiish [28.3K]

Answer:

Differences in their boiling points

Explanation:

When crude oil is distilled and separated into categories, the categories are characterized by the differences in their boiling points.

At different boiling points, each of the fraction will separate out.

Crude oil is made up of different fractions of hydrocarbons.
As the chain length of the hydrocarbon increases, the volatility reduces and boiling point increases.
Components with short carbon lengths rises out from the column first and are cooled and extracted.
The categories are thereby, classified based on differences in their boiling points.

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3 years ago

Consider a cell in which Cl- distributes passively across the membrane according to the membrane potential. The resting membrane

UNO [17]

Answer:

1000 mM

Explanation:

Using V = -60 mV㏒₁₀[K/K'] where V = membrane potential = -60 mV, K = intracellular concentration = unknown and K' = extracellular concentration = 100 mM

So, V = -60 mV㏒₁₀[K/K']

-60 mV = -60 mV㏒₁₀[K/K']

dividing both sides by -60mV, we have

-60 mV/-60 mV = ㏒₁₀[K/K']

㏒₁₀[K/K'] = 1

taking antilogarithm of both sides, we have

[K/K'] = 10¹

multiplying both sides by K', we have

K = 10K'

K = 10 × 100 mM

K = 1000 mM

So, the intracellular Cl- concentration is 1000 mM

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3 years ago

True or false? if you used a radioactive label to trace the pathway of carbon through cell respiration, the label would begin in

Lorico [155]

If you used a radioactive label to trace the pathway of carbon through cell respiration, the label would begin in glucose and en in co2. TRUE

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3 years ago