Epinephrine in animals and auxin in plants act as hormones
that triggers specific cellular responses that vary among different tissues of
the organism. The biosynthesis of epinephrine involves breaking just one
carbon-carbon bond in the amino acid tyrosine, Synthesizing epinephrine
requires breaking the bond between the carboxyl group (COOH) and the α-carbon
in tyrosine.
Answer:
The opening of voltage-gated sodium channels
Explanation:
Fragmento destacado de la Web
Depolarization occurs when sodium ions move across the cardiac cell membranes generating a change in charges and therefore the depolarization.
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Answer:
The cell wall
Explanation:
The cell wall exists to protect the cell, maintain its shape and regulate water uptake. The cell wall is much thicker than the cell membrane, providing an extra layer of protection. In plants, the cell wall is made of fibres of the polysaccharide cellulose, which is a structural carbohydrate.
This gives organisms such as plants much more structure - e.g. they can stand upright without the need for bones. However, they lack the same flexibility that animal cells have.
Answer:
Egg is HYPERTONIC
Water in the bowl is HYPOTONIC
The egg will become filled with water over time
Explanation:
Tonicity refers to the ability of an extracellular solution to direct the flow of a solvent (water) in and out a cell. There are three types of tonicity; hypertonic, hypotonic and isotonic. A solution is said to be HYPERTONIC when the concentration of solute in it is higher than its external solution. This is the case of the egg cell that contains 7% salt (solute).
A HYPOTONIC solution is that which contains a lower solute concentration than it's external solution. This is the case of the water in the bowl that contains 3% salt concentration.
Tonicity determines which direction osmosis occurs. Osmosis is the movement of solvent/water from a region of high solvent concentration/low solute to a region of low solvent concentration/high solute concentration via a semi-permeable membrane. In this case, water (solvent) will move through the egg cell membrane (semi-permeable membrane) from the bowl with a low solute concentration into the egg with a high solute concentration. Hence, over time, the egg cell will be filled with water.
There are 6 genotypes possible I believe
