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Darya [45]
3 years ago
8

How does a cell separate itself from its environment and still allow materials to leave and enter the cell in order to maintain

homeostasis?
Biology
1 answer:
Damm [24]3 years ago
8 0

ah! All thanks to the cell membrane!

The cell membrane contains phospholipids that are amphiphilic (polar - water attracting and non-polar - water repelling) in nature. That's why the cell membrane allows non-polar materials to pass through but not polar materials. (if you're learning junior science you really don't need to know this!) The polar materials require proteins found on the cell membrane called protein channels or carrier proteins to pass through. (their names are pretty self-explanatory!)      

All the best!

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which statement correctly describes how the amount of ofoxygen in the earth’s atmosphere has changed over time?
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Answer:

Based on the relative volumes of the gases in Earth’s atmosphere, nitrogen is actually more than 3 times more than oxygen. Because the troposphere is the lowest atmosphere layer, it contains 75 percent of the atmosphere’s mass.. From largest to smallest, Earth’s atmosphere composition contains nitrogen, oxygen, argon, CO 2 and trace gases.

Explanation:

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Which number in the diagram represents a landform made by the deposition of sediments.
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1. The complete breakdown of glucose in the presence of oxygen occurs in two stages: glycolysis and (). The first of these stage
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Answer:

The complete breakdown of glucose in the presence of oxygen occurs in two stages: glycolysis and citric acid cycle. The first of these stages occur in the cytoplasm of the cell, and the second stage occurs in organelles called Mitochondria.

Explanation:

The breakdown of glucose occurs in two stages. The first stage occurs inside the cytoplasm, it is called glycolysis. when a molecule of glucose undergoes glycolysis, the following are produced:

2 ATP (Adenosine triphosphate) molecules;

2 water molecules;

2 pyruvate molecules and;

2 NADH (Nicotinamide Adenine dinucleotide) molecules

The second stage occurs in an organelle called Mitochondria, it is called citric acid cycle or tricarboxylic acid or Kreb's cycle. In this stage, the two pyruvate molecules from the glycolytic cycle are reduced to carbon(iv)oxide. The following are produced:

2 ATP molecules;

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2 FADH2 (flavine adenine dinucleotide) and;

4 molecules of carbon(iv) oxide.

The NADH and FADH2 molecules are used in the electron transport chain generates as much as 28 ATP molecules.

4 0
3 years ago
Jennifer observes a weather map showing tomorrow's weather. She predicts that air will travel from the low pressure system to th
Aleksandr-060686 [28]

Answer:

Jennifer observes a weather map showing tomorrow's weather. She predicts that air will travel from the high pressure system to the low pressure system, causing wind. The wind will carry moisture since it is coming from the ocean.

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When warm air from land rises, air from the ocean in to replace it. The wind coming from the ocean is moisture-laden, and results in precipation on land.

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