What is the principal of fossil succession?

1 answer:

4 0

It basically means the oldest rocks and newest rocks are organized from top to bottom, like a bunk bed, oldest at the bottom, newest at the top in chronological order.

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Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the c

Naily [24]

Answer:

by the sarcoplasmic reticulum's calcium ion pumps

Explanation:

Rigor mortis or postmortem rigidity, is a state caused by chemical changes in the muscles that occur post mortem and cause the limbs of the corpse to stiffen.

This occurs because after death, there is no cellular respiration and consequently, no oxygen nor ATP (ATP is required for the muscle relaxation).

Calcium enters the cytosol after death because it is released due to the deterioration of the sarcoplasmic reticulum and due to the breakdown of the sarcolemma. Ca2+ ions activate the formation of actin-myosin cross-bridging necessary for the contraction. Muscles are unable to relax, because myosin heads continue to bind with the active sites of actin and there is no ATP to destabilize the myosin-actin bond.

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In the chemical reaction that forms hydrogen peroxide (H2O2), hydrogen and oxygen share electrons, creating ________ bonds betwe

777dan777 [17]

Answer:

The correct answer is - covalent bond.

Explanation:

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3 years ago

The proposed cause of CJD and kuru in humans, mad cow disease, and scrapie in sheep is a change in a brain protein. Disease vict

TiliK225 [7]

Answer:

secondary structure

Explanation:

Alpha helices and beta sheets are two main structural forms in secondary structure of proteins. This structures are formed spontaneously. The next step of protein structure formation is folding into tertiary three-dimensional form.

In diseases such as CJD and kuru, protein prion is changed in structure. It is not known how degeneration of priones protein structure occurs, but it can lead to neurodegenerative diseases which can even be fatal.

Priones are also known as proteinaceous infectious particles.

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4 years ago

Are pictures of relationships

levacccp [35]

Huh? Lol I don’t get the question

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3 years ago

When classifying the intensity of resistance exercise during assessment, repetitions fewer than ____________ primarily measure l

e-lub [12.9K]

Answer:

5;15

Explanation:

Local muscular strength and local muscular endurance are two important qualities of muscle functioning. The maximum weight a muscle can lift is indicated by Local muscular strength while the number of repetitions of particular task a muscle can perform without being exhausted is indicated by local muscular endurance. These both tasks are frequently used in our daily life

For example if you can pull 50 kg weight that would be your local muscle strength and if u can pull it 20 times that would be your local muscle endurance.

While performing the the intensity of resistance exercise during assessment if you pull the 50 kg weight less than 5 times it would be considered as local muscular strength and if you pull it greater than 15 times it would be considered as local muscular endurance.

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3 years ago