Genetics was the key information that was not known during Darwin’s time.
Telomerase is fully active in germ and stem cells, but almost completely inactive in somatic cells.
<h3>What is cell?</h3>
- The smallest biological unit capable of supporting life on its own and constituting both all living entities and bodily tissues.
- The three essential parts of a cell are the cell membrane, nucleus, and cytoplasm.
- The cell membrane, which encloses the cell, controls the chemicals that enter and exit the cell.
- The nucleus, a part of the cell that contains the nucleolus, is where the majority of the cell's DNA is found.
- Additionally, the majority of RNA is produced there.
- Cytoplasm is the term for the substance that makes up a cell.
- It also features extra tiny cell parts with separate functions.
- In the cytoplasm, the majority of chemical reactions and protein synthesis take place.
- There are almost 30 trillion cells in the human body.
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plant growth
animal actions
pressure release
Explanation:
The causes of mechanical weathering of rocks include plant growth, animal actions and pressure release. Acid rain and carbon dioxide leads to chemical weathering of rocks.
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soil.
- Mechanical weathering is also known as physical rock weathering.
- In this type of weathering huge masses of rocks are broken down into tiny pieces.
- When plant grows on rocks, their roots penetrates through cracks in the rock and can disintegrate it.
- Some animals burrow and bore deep into rocks.
- When a rock mass is lifted from the top of another, pressure release leads to the formation of exfoliation in which a rock resembles an onion peel.
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Answer:
A useful model for enzyme action is the Lock and Key model.
Explanation:
The Lock and Key model or theory was first postulated by <u>Emil Fischer</u> in 1894. It is used to represent the enzyme and its specific substrate. The enzyme (lock) is specifically activated by the substrate (key) through its active site (key hole) to produce a catalyzed reaction. If the keys are too small or too big for the key hole, it will not produce any reaction.
The Double Helix model by Watson and Crick is used to represent the DNA present in an individual. This is made up of <u>two strands of DNA</u> bounded by hydrogen bonds. In between these bonds are nitrogenous bases <u>adenine (A), guanine (G), thymine (T), and cytosine (C).</u>
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The Ball and Socket model represents body joints, specifically the hip and the shoulder joints. The shape of the <u>head of the joint is spherical</u> and <u>fits into a cup-like depression of the receiving bone</u>. The <u>range of motion </u>of this joint is usually <u>wide</u> and has <u>one central point</u>.
The Amino Acid Chain model, also known as polypeptides, are linked together by a <u>peptide bond</u>. A peptide bond is produced by hydrolysis. The chain usually <u>starts with the amino group and ends with the carboxyl group</u>.
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