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sveta [45]
3 years ago
6

Control of (blank) synthesis is the key to controlling the chemical pathway of the cell.

Biology
1 answer:
strojnjashka [21]3 years ago
3 0
Controlling the synthesis of proteins is the key to controlling the chemical pathways in the cell.
This is because proteins have key roles in many chemical reactions in the cell.
The most important proteins for the chemical reactions in the cell are enzymes.
Enzymes catalyze many chemical reactions, therefore, the control of the enzyme synthesis is a direct way of controlling other chemical reactions in the cell.
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Which of the following statements correctly describes some aspect of ATP hydrolysis being used to drive the active transport of
saw5 [17]

Answer:

B) This is an example of energy coupling

Explanation:

Energy coupling is a process by which cells carry out thermodynamically unfavorable, endergonic (energy-requiring) reactions to other exergonic (reactions that liberate free energy) reactions.

Reactions which are endergonic do not occur spontaneously as they result in a decrease in entropy and a positive free energy change, ∆G.

Exergonic reactions occur spontaneously as they result in an increase in entropy and have a negative free energy change, ∆G.

For example, the active transport of ions against their concentration gradients in cells is a non-spontaneous endergonic process which is coupled to the hydrolysis of ATP, an exergonic process in other for the reaction to proceed. ATP hydrolysis phosphorylates an amino acid side chain in the transport protein which then drives the forward process of transport of the ion.

Considering the above,

Option A: The hydrolysis of ATP is endergonic, and the active transport is exergonic is false because ATP hydrolysis is exergonic while active transport is endergonic.

Option B: This is an example of energy coupling is true.

Option C: Both ATP hydrolysis and active transport are spontaneous because they result in an increase in entropy of the system is false because only ATP hydrolysis is spontaneous

Option D: Neither ATP hydrolysis nor active transport is spontaneous is false because ATP hydrolysis is spontaneous.

Option E: ATP is acting as a transport protein to facilitate the movement of the ion across the plasma membrane is false because ATP is not a protein, rather it serves to activate the transport protein by phosphorylating it.

8 0
3 years ago
Sort the descriptions based on asexual or sexual reproduction
MariettaO [177]

Answer: creates genetically identical offspring,  organism doesn’t have to waste energy to find a mate organism, requires the contribution of a single parent.

Explanation: While asexual reproduction only involves one organism, sexual reproduction requires both a male and a female.

Some plants and unicellular organisms reproduce asexually. Most mammals and fish use sexual reproduction.

Asexual Reproduction                   Sexual Reproduction

Two or more                                     One or more

8 0
3 years ago
Which of the following describes the process of glycolysis? See Concept 9.2 (Page 170) View Available Hint(s) Which of the follo
Paul [167]

Answer:

It represents the first stage in the chemical oxidation of glucose by a cell.

Explanation:

Glycolysis is the first stage of oxidation of glucose by the process of cellular respiration. Glycolysis includes the breakdown of one molecule of glucose into two molecules of pyruvate. Substrate level phosphorylation forms net 2 ATP molecules and the redox reactions of glycolysis uses NAD+ as an electron acceptor resulting in the formation of 2 NADH.

Therefore, one molecule of glucose obtains 2 pyruvate molecules, 2ATP and 2 NADH by glycolysis. The fate of pyruvate depends on the availability of oxygen. Citric acid cycle and oxidative phosphorylation are the next two stages of aerobic cellular respiration.

8 0
3 years ago
External fertilization in fishes is called ____________.
alexandr402 [8]
Spawning.......................................................
7 0
3 years ago
From a single fertilized ovum undergoing a series of rapid cell divisions, a human infant develops. The embryonic cells become s
weeeeeb [17]

Answer:

Answer is C

Explanation:

Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes leading to a variety of cells

3 0
3 years ago
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