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kati45 [8]
3 years ago
14

How does natural selection or human evolution affect disease susceptbility

Biology
1 answer:
devlian [24]3 years ago
4 0
<span>Investigations of the legacy of natural selection in the human genome have proved particularly informative, pinpointing functionally important regions that have participated in our genetic adaptation to the environment. Furthermore, genetic dissection of the intensity and type of selection acting on human genes can be used to predict involvement in different forms and severities of human diseases.</span>
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True or false: in the sequence aggcct, an available phosphate group would be found at the 5' end of the nucleotide labeled "t."
Oksanka [162]

The answer is false.

an available phosphate group would be found at the 5' end of the nucleotide labeled A. The 5′-end of a DNA contains a phosphate group that is  attached to the 5′ carbon of the ribose ring and that A phosphate group  permits ligation of two nucleotides ( phosphodiester bond).


4 0
3 years ago
The prolonged electrical depolarization of cardiac muscle cells that occurs during contraction is due primarily to the persisten
luda_lava [24]

Answer:

The prolonged electrical depolarization of cardiac muscle cells -that occurs during contraction- is due primarily to the persistent influx of calcium ion

Explanation:

The action potential of the heart muscle is longer with respect to skeletal muscle (around 300 milliseconds), and this is due to the activity of calcium (Ca⁺⁺ ) in the intracellular compartment.

The initial depolarization of cardiac muscle fiber depends on the entry of sodium (Na⁺) into the cell. However, for the action potential to occur and be maintained, Ca⁺⁺  must increase its cytoplasmic levels, which depends on:

  1. The increase in intracellular sodium induces the release of Ca⁺⁺ from the sarcoplasmic reticulum.
  2. Calcium entry from the extracellular space through the voltage dependent Ca⁺⁺ channels.
  3. The entry of extracellular Ca⁺⁺ causes the release of more Ca⁺⁺ ions by the sarcoplasmic reticulum, further increasing its intracellular concentration.

This is how the ion that guarantees the duration of the action potential of the cardiac muscle cell is the Ca⁺⁺.

Learn more:

Calcium, sodium and cardiac muscle cells brainly.com/question/4473795

4 0
3 years ago
How do nerve cells form different types of tissues? A. A group of these cells perform similar functions and become nerve tissue
lions [1.4K]
It's letter c i believe, because they need the DNA's instruction on how to copy the exact tissue copy.
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3 years ago
What part of the plant takes water for photosynthesis to occur in?
Sonbull [250]
The root of the plant is what takes in water.
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3 years ago
(20 points) Click on the statement. Decide if it is true or false, then select that choice to add it to the appropriate set.
vaieri [72.5K]
The correct answer is I’m just doing this for points shehdheh ye
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