The correct answer is: oxaloacetate
Anaplerotic reactions are chemical reactions that form intermediates that can be used in the further steps of metabolic pathways. These reactions are very important, because it is crucial for the cell to regulate concentrations of TCA cycle metabolites and intermediates.
The reaction in which pyruvate is converted to oxaloacetate is catalyzed by pyruvate carboxylase and it occurs in mitochondria. Also, pyruvate can be converted to L-malate, in a similar way.
Answer:
A. Homeostasis allows organisms to regulate their temperature.
Explanation:
Homeostasis is a biological process through which the body of organisms try to maintain a relatively stable body conditions irrespective of the changes in the external environment.
<em>Homeostasis keeps body processes such as temperature, pressure, hydration, pH, etc. relatively stable. While some organisms maintain a stable body temperature by generating heat (endotherms), others do so by adjusting their body temperature to be in tune with that of the external environment (ectotherms). </em>
The correct option is A.
Answer:
Observable
Explanation:
An observable phenomenon leads to an hypothesis.
Answer:
b. The rigid cell walls limit how far plant cells can expand and exert a back pressure to limit further water uptake.
Explanation:
Plant cells have a rigid cell wall made of cellulose. Animal cells lack a cell wall.
When the plant cells are placed in a hypotonic solution, water enters into the cells and the cells expand. However, after a certain limit, the cell wall exerts wall pressure on the contents of the cell and does not allow it to take more water in. The wall pressure from the cell wall of plant cells protects them against bursting when placed in a hypotonic solution.
Animal cells burst out due to intake of water by osmosis when placed in a hypotonic solution. They do not have a cell wall to protect them from bursting.
Lock and key theory states that enzymes have a specific shape that directly correlates to the shape of the substrate.
<h3>What is the lock and key theory of enzymes?</h3>
Enzymes are globular protein that catalyses a biological chemical reaction.
One of the characteristics of enzymes is that they are usually substrate-specific i.e. They bind and act to a particular substrate.
This characteristics is explained by the lock and key theory of enzymes, which states that enzymes have a specific shape that directly correlates to the shape of the substrate.
Learn more about enzymes at: brainly.com/question/17320375
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