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hjlf
2 years ago
14

True or false? during cytokinesis in plant cells, does the new cell membrane forms before the new cell wall or after after the n

ew cell wal?.
Biology
1 answer:
lianna [129]2 years ago
8 0

Answer:

True

Explanation:

It is true because the cytoplasm is partitioned by the construction of a new cell wall, the cell plate, inside the cell

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Slow change over a long period of time is called?
bogdanovich [222]
Evolution is a slow change that occurs over time

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3 years ago
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Summarize the process of photosynthesis in your own words. Be sure to describe both light and dark reactions.
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Photosynthesis is the process by which green plants absorb light energy from the sun with the assistance of water and carbon dioxide, and transform it into chemical energy to make (synthesize) carbohydrate (specifically glucose) and oxygen.

The "light-independent" or dark reactions happen in the stroma of the chloroplasts. This is also known as the Calvin Cycle. Since these processes can only happen in the chloroplast (a chlorophyll filled plastid in green plants), photosynthesis can only happen in green plants!

The first overall principle of photosynthesis is that the light energy from the sun is transformed into chemical energy and stored in the bonds of glucose (the sugar carbohydrate) for later use by the plant and/or organism that eats the plant.

The second overall principle of photosynthesis is that carbon, oxygen, and hydrogen atoms are taken from carbon dioxide and water molecules and are broken up and rearranged into new substances: carbohydrate (specifically glucose) and oxygen gas (so we can breathe, whew!). This reaction represents the transfer of matter: carbon dioxide from the atmosphere, water from the soil or atmosphere, into sugar in the plant and oxygen back into the atmosphere.

Light-Dependent Reactions

The first part of the process happens in the thylakoids of the chloroplasts and are the "light-dependent" reactions: The photosystems I and II absorb the photons from the sunlight and process them through the membranes of the thylakoids simultaneously. The photons excite electrons in the chlorphyll which then move through the electron transport chain and causes NADP- to combine with H+ forming NADPH. At the same time, ADP (adenosine diphosphate) has come from the dark reaction and a third phosphate chain is bonded forming ATP (adenosine triphosphate) to feed the Calvin Cycle next. Remember that ATP is the important source of all cellular energy.

We now believe that all the oxygen released in photosynthesis comes from the water molecules and all oxygen atoms that form the carbohydrates come from the carbon dioxide molecules. So, in other words during the light-dependent reaction a water molecule is broken down producing two H+ ions and half an oxygen molecule. We get the rest of the oxygen molecule when another water molecule is broken down.

Dark Reactions

Dark reactions are also known as the Calvin Cycle, the Calvin-Benson cycle, and light-independent reactions. The point is that they do not require sunlight to complete their process.

After ATP is formed in the first part of photosynthesis, for living things to grow, reproduce and repair themselves, the inorganic form of CO2 must be transformed into carbohydrate. This happens during the Calvin Cycle in the stroma (the fluid filled interior of the chloroplast). ATP and NADPH combine with CO2 and water to make the end product of glucose. The ADP and NADPH+ are recycled to the light-dependent side to start the process over.

Remember that during hours of darkness, plants cannot perform photosynthesis so they do cellular respiration in the mitochondria just as all living organisms do.

5 0
3 years ago
After Dante catches the flu virus, he feels very tired and loses his appetite. His body aches and he gets a high fever. Which be
gizmo_the_mogwai [7]

Answer:

It would be a internal illness because his body is responding to an illness.

7 0
3 years ago
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Particles that are far apart and can move freely is what
Dafna1 [17]

Answer:

a gas

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In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other.

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10. En la orina de composición química normal, podemos encontrar sólo:
Alex

Answer:

a. Agua, Glucosa y Urea

Explanation:

La orina es el producto final del trabajo del tracto urinario (producto de la función renal durante el proceso de filtración de la sangre). La orina elimina todos los productos del metabolismo solubles en agua del cuerpo: urea, ácido úrico, creatinina, sulfatos, fosfatos, electrolitos, sustancias tóxicas, fármacos y agentes de contraste.

La composición normal de la orina consiste en: agua (95%) y compuestos orgánicos.

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3 years ago
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