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3 years ago

What action is directly responsible for the generation of an action potential at the sarcolemma?

Biology

1 answer:

Over [174]3 years ago

7 0

Answer:

Nervous stimulus action for muscle contraction

Explanation:

Nerve stimulation is sent to the sarcolemma, which are motor nerves at the neuromuscular junction (junction between the terminal part of a motor axon with a motor plate), after which nerve endings implant in the sarcolemma and form plaque on the surface of muscle fibers, which in turn transmit stimulus to the musculature.

Then, an electrical current (from the stimuli) is generated, it propagates through the muscle cell membrane, reaches the cytoplasm and triggers the muscle contraction mechanism.

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Which of the constituents found in eukaryotic cells are correctly ranked from largest to smallest?

Oksanka [162]

Answer: a. Cell nucleus, g. Mitochondrion, f. Ribosome, e. Protein, d. Amino acid, c. Water molecules, b. Proton

Explanation:

a. Cell nucleus: It is a membranous organelle found only inside eukaryotic cells, which contains most of the genetic material of the cell, organized into DNA macromolecules called chromosomes, inside which are the genes. DNA contains the necessary pattern for all cell operations. It size is usually between 5-25 µm

g. Mitochondrion: It is a cellular organelle found in eukaryotic cells, and provides the energy needed to carry out cellular activity. That is, the mitochondria is responsible for breaking down nutrients and synthesizing adenosine triphosphate or ATP, which is essential for obtaining cellular energy. The mitochondria is characterized by its large size, compared to other cellular organelles, and its globular shape. Its size ranges from 0.5 to 1 μm in diameter and up to 8 μm in length.

f. Ribosome: It is a cell particle made of RNA and protein that serves as the site for protein synthesis in the cell. The ribosome reads the sequence of messenger RNA (mRNA) and, using the genetic code, translates the sequence of RNA bases into an amino acid sequence. The size of the ribosomes is tiny, so they can only be seen through a microscope. This size will depend on the cell in which it is found. In eukaryotic cells it will have a diameter of 320 A (ångström), or 0.032 µm.

e. Protein: It is a macromolecule formed by linear chains of amino acids. This sequence is determined by the sequence of nucleotides of their corresponding gene (called structural genes). Proteins are generally made up of between 100 and 300 amino acids, although some may have more than a thousand amino acids. On average, its size is around 6.8 nm or 0.0068 µm.

d. Amino acid: It is an organic molecule with an amino group (-NH2) at one end of the molecule and a carboxyl group (-COOH) at the other end. They are the basis of proteins, however both these and their derivatives participate in cellular functions as diverse as nerve transmission. Two amino acids combine in a condensation reaction between the amino group of one and the carboxyl of the other, releasing a water molecule (dehydration) and forming an amide bond called a peptide bond. This reaction takes place naturally inside the cells, in the ribosomes. In the genetic code, the twenty different amino acids, also called residues, are coded, which constitute the links that make up peptides. On average, their size is around 0.4-1 nm.

c. Water molecule: (H2O) is an inorganic chemical compound formed by two atoms of hydrogen (H) and one of oxygen (O). This molecule is essential in the life of living beings, serving as a medium for the metabolism of biomolecules, and it is found in nature in its three states. Its size is around. 0.27 nm.

b. Proton: A proton is a positively charged particle found inside the atomic nucleus, where neutrons are also found. It is very difficult to measure the size of the proton, because it is made up of three particles (the quarks) that move very quickly.

7 0

4 years ago

Is higher biodiversity good or bad?

snow_tiger [21]

Answer:

it all depends

Explanation:

doepends on wha tt the object is some cn be harmful to humans but some can be beefictial

5 0

3 years ago

Substances that enter the cell without the expense of cellular ATP, but are too large to directly pass through the membrane, use

Anit [1.1K]

D) membrane proteins.

8 0

3 years ago

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The backbones of DNA and RNA are

Nutka1998 [239]

Answer:

The answer is very likely C.

Explanation:

This becomes easy once we remember that DNA and RNA are not identical - which is why they have different names, RNA = 'ribo', DNA = 'deoxy.' This eliminates choice (A). While they are different, they are not incredibly different - DNA and RNA are both made up of nucleotides - they are not however, made up of Amino acids. Amino acids are what they can code for, and subsequently create proteins during protein synthesis. This helps us eliminate (B). Finally, we know that in order for something to have base pairs it needs to be double stranded - which RNA is not. Which means that because RNA is not double stranded (its singly stranded) that the answer cannot be (D). Leaving us with the only plausible option; (C).

6 0

3 years ago

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For centuries, people have been selectively breeding plants and animals to have certain desirable traits. Gregor Mendel predicte

kondaur [170]

The answer would be C. Genes

6 0

3 years ago

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