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2 years ago

Why is the cell membrane called a semi-permeable membrane

Biology

1 answer:

GREYUIT [131]2 years ago

4 0

Answer:

The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... It allows hydrophobic molecules and small polar molecules diffuse through the lipid layer, but does not allow ions and large polar molecules cannot diffuse through the membrane.

Explanation:

<h2><u><em>This is all I know.</em></u></h2><h2><u><em>Hope it helps~</em></u></h2><h2><u><em>Good luck with your work!!~</em></u></h2>

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What ultimately happens to the bulk of matter in any traffic level ?

jekas [21]

That as you increase in trophic level 1/10th of the nutrients is lost. Starting at the consumers (plants) all the way to humans.

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3 years ago

Which of these is a mixture a. Water b. Vinegar c. Carbon dioxide d popcorn salt

BigorU [14]

Popcorn salt is the mixture!

6 0

3 years ago

Read 2 more answers

The four nucleotides found in human DNA (G, A, T, C) combine in groups of three to create potentially 64 different amino acids,

Liula [17]

Question 1

Answer:

D- Different nucleotide combinations code for the same amino acid.

Explanation:

Some amino acid has more than one nucleotide combination coding for it.

Question 2

Answer:

B- Redundancy

Explanation:

Redundancy means that more than one codon is assigned for the coding of most amino acids.

Question 3

Answer:

Explanation:

Since both parents are homozygous dominant and recessive respectively, no crossing can give the homozygous dominant as all offspring are heterozygous.

Question 4

Answer:

Homozygous.

Explanation:

The genotype 'dd' is homozygous since the two letters are both in the lower case.

Question 5

Answer:

25%

Question 6

Answer:

Dihybrid cross

3 0

3 years ago

Consider the scenarios described below. Match the concept described by the scenario with the theory.

astraxan [27]

Answer:

1 - natural selection

2 - uniformitarianism

3- inheritance of acquired characteristics

4 - catastrophism

Explanation:

1. Natural selection refers to the evolution of organism or changes in the characterstics of organism depending on the environmental conditions. Hence, the lizard moved on fantasy island evolved with larger head and stronger bites as per the environmental condition.

2. The concept of Uniformitarianism states that the natural geological processes happening in present have already occured in past with same intesity and rate. Hence, geologist uses the phrase "The present is the key to the past" for formation of mountain, rock formation and water movements.

3. Inheritance of acquired characteristics are the characteristic acquird by the ancestors and transmitted that gradually acquired characteristic to their progeny. Hence, the rats acquire the charactieristics and transfered it to the next generations.

4. Catastrophism means the regular occurrence of meteorological and geological disturbances to explain the existence the fossil record. Hence, teh mass exticiton due to asteroid impact is an example of Catastrophism.

So, the correct options in sequential order is natural selection, uniformitarianism, inheritance of acquired characteristics, and catastrophism.

3 0

3 years ago

What is Abiotic and Biotic ?

Katyanochek1 [597]

Answer:

abiotic factors refer to non-living physical and chemical elements in the ecosystem like water, air and sunlight.

biotic factors are living ot once-living organisms in the ecosystem like humans and animals

basically biotic is alive and abiotic is not alive

4 0

3 years ago