Voluntary control of skeletal muscles is provided by the

Biology

1 answer:

weqwewe [10]3 years ago

8 0

Answer:

The correct answer will be- somatic nervous system/ Corticospinal pathway.

Explanation:

The voluntary control of the human body is controlled by the somatic nervous system of the peripheral nervous system.

The somatic nervous system is the type of the nervous system formed by the neurons present at the periphery or outside the CNS and thus composed of the spinal and cranial nerves.

The somatic nervous system is made of two types of nerves - afferent nerves which brings the impulse from the sensory organs to the CNS and the efferent nerves which transmits the signals from the CNS to the skeletal muscles.

Thus, the somatic nervous system is the correct answer.

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In some plants, phloem cells are connected end-to-end by sieve plates, creating a direct connection between the cytoplasm of phl

ella [17]

Answer:

Explanation:

This is because the sieve plate interconnected like that help in exchange of substances or transport of substances between element cell and it act as a barrier to prevent the sap from been loss when phloem is damaged or cut. The sieve plates form the sieve tube which is the conducting element of the phloem. It is formed from series of elongated cells that are interconnected by perforations in their walls.

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The data obtained from the meselson–stahl experiment after one generation of replication eliminated the dispersive model of dna

Sedaia [141]

<h2>Given statement is false</h2>

Explanation:

According to dispersive model of DNA replication,DNA molecules are hybrids of parental and daughter DNA;In this model each individual strand is a combination of original and new DNA

Meselson and Stahl did an experiment on DNA replication using E.coli bacteria

E.coli was grown in a medium containing heavy isotope of nitrogen,bacteria took up the nitrogen and used to synthesize new biological molecules,including DNA
It was grown for many generations,the nitrogenous bases of the bacteria's DNA were all labelled with heavy nitrogen
Bacteria were then switched to light nitrogen isotope and allowed to grow for several generations
They then measured the density of the DNA using density gradient centrifugation
This method separates molecules such as DNA into bands by spinning them at high speeds in the presence of another molecule, such as cesium chloride
Each DNA produced two DNA molecules each with one new strand and one old strand called semi conservative replication(half of the parental DNA conserved in daughter DNA)
Each DNA strand act as a template for synthesis of new strand
Hence,dispersive model of DNA was eliminated and semi-conservative model of DNA replication was proved by the above experiment