Answer:
Explanation:
The cell membrane, also called the plasma membrane, has the following characteristics:-
It is present as the outermost layer in animal cells and lies below the cell wall in plant cells.
The cell membrane surrounds the cytoplasm of living cells, physically separating the intracellular components from the extracellular environment.
The cell membrane is semi-permeable, ie, it allows some substances to pass through it and does not allow others.
It is thin, flexible and a living membrane, which consists of a lipid bilayer with embedded proteins/
The cell membrane has large content of proteins, typically around 50% of membrane volume. These proteins are important for cell because they are responsible for various biological activities.
Answer:
ADP is combined with a phosphate to form ATP in tADP+Pi+free energy→ATP+H2O
Explanation:
The energy released from the hydrolysis of ATP into ADP is used to perform cellular work, usually by coupling the exergonic reaction of ATP hydrolysis with endergonic reactions.
The new DNA molecule is identical to the original DNA.
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Answer:
The correct answer is: b. lightening of media in the unsealed tube only.
Explanation:
- According to the question, the bacteria can undergo only aerobic respiration, that is it can produce its energy, that is, ATP, or adenosine triphosphate, only in the presence of oxygen.
- The unsealed tube allowed air or oxygen to pass into it which can be used by the bacteria for its respiration. In the process, it will produce acid that will cause the media colour to lighten.
- The sealed tube do not allow any oxygen to pass into it. As the given bacteria can undergo only aerobic respiration but not anaerobic respiration, in absence of oxygen it will not be able to undergo respiration and produce energy and acid. Hence, the media colour will remain unchanged.
- The control tube is used to check the sterility of the media.
