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3 years ago

14

How does energy usually flow in ecosystems? A. from the Sun through producers to consumers B. from consumers through the Sun to

producers C. from producers through the Sun to consumers D. from the Sun through consumers to producers

2 answers:

Ipatiy [6.2K]3 years ago

7 0

The answer should be A

madreJ [45]3 years ago

3 0

Answer:

A. from the Sun through producers to consumers.

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Identify the major chromosomal abnormalities and their causes (eg. down's syndrome, turner's syndrome, klinefelter's syndrome, c

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Chromosome defect lot of became syndrome.
it's lot of cause

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3 years ago

In a solution, the solute is the substance present in the greatest amount.

amid [387]

The answer to this question would be false.

The solute is a substance that was dissolved by the solvent. The amount of solute that can be dissolved is called solubility. The amount of solute mostly small and if it solubility too high it will be precipitated.
There are no rules state that solute should always be the greatest amount.

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1. Please describe the signal transmission across a myoneural junction that allows the nervous system to move the muscles of a f

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1. Action potential reaches the axon terminal and depolarizes it.

2. Depolarization opens voltage-gated calcium channels, enabling influx of Ca into the neuron.

3. Calcium binds to specialized proteins on vesicles (containing pre-made acetylcholine) and triggers them to fuse with the neuron membrane at the synapse.

4. Exocytosis of acetylcholine into the synaptic cleft occurs.

5. Acetylcholine diffuses across the synapse and binds to nicotinic receptors on the end plate of the myocyte.

6. Activated nicotinic receptors, themselves ion channels, cause cation influx into the myocyte and generate an end plate potential. This eventually gives rise to the full depolarization within the myocyte that enables contraction.

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The histone proteins are among the most slowly evolving proteins. For example, a histone protein called histone H4 in cows and p

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The statement is true, histones are proteins that are high in the amino acids lysine and arginine, making them extremely basic in their structure.

Histones control the degree of packaging of DNA during the processes of gene expression, replication or repair of hereditary material, among many others.

Histones H2A, H2B, H3 and H4 are small and basic proteins that are highly conserved in evolution and are composed of a globular domain at the carboxy-end, and by regions known as "tails", which are found at the amino-terminal end.

These tails are high in the amino acids lysine and arginine, which give them a positive charge.

This region is the site of numerous post-translational modifications that, it has been proposed, would modify the histone charge, altering the accessibility of the DNA and the protein / protein interactions with the nucleosome.

Chromatin compaction occurs due to the interaction between the negative charges of DNA and the positive charges of amino acids, mainly located on the tails of histones H3 and H4.

Therefore, we can conclude that the modifications on the amino acids lysine and arginine that form the basic part of the histone structure alter their functions.

Learn more about histone proteins here: brainly.com/question/14984828

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Which acts to lubricate the joint surface and nourish the tissues of the internal joint surface?

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Synovial fluid

This is fluid secreted by the bursa sac to nourish and lubricate the joint

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3 years ago