Question

Which of the following are forms of cell regulation?
I enzyme activity
II. osmosis
III. diffusion
A.
I and Il only
B.
I,II, and III
C.
ll and Ill only
D.
I and III only

Answer 1

Explanation:

D. I and III only

Cell regulation, or the maintenance of a cell's constant internal environment is a form of homeostasis. Cells maintain their pH, water content, and solute concentrations through enzymatic activity and diffusion.

Further Explanation:

During homeostasis the body maintains a constant internal balance in pH, temperature, blood pressure etc. Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis.  Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages. These cascades involve

• enzymatic activity; enzymes are specialized proteins which act on substrates in order to speed up reactions. In homeostasis, enzymes act on substances which can disrupt the homeostatic balance, while their optimal pH and temperature are maintained by homeostasis itself.
• diffusion; small water molecules can move across the phospholipid bilayer acts as a semi-permeable membrane into the extracellular fluid or the cytoplasm which are both hydrophilic and contain large concentrations of polar water molecules or other water-soluble compounds.

However, in the body, the maintenance of the balance of solutes and solvents, is called osmoregulation, which merely involves osmosis; here the water passes through the membrane due to the difference in osmotic pressure on either side of the phospholipid bilayer, this means that the water moves from regions of high osmotic pressure/concentration to regions of low pressure.

Learn more about membrane components at brainly.com/question/1971706

Learn more about plasma membrane transport at brainly.com/question/11410881

Learn more about homeostasis at brainly.com/question/1601808

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Answer 2

Answer:

I and III only(option D)

Explanation:

Cell regulation refers to process or processes that brings about the controls of different events by which the cell cycle is completed. For cell cycle to take place ,a cell duplicate a copy of its DNA and other contents, and later result into two division. Once there is abnormalities in the process of cellcycle regulation will be faulty because the cellsmay brings about uncontrollable division which may result to diseases such as cancer.

Therefore,The cell cycle is the cell's way of replicating itself in an organized, step-by-step fashion. Ensures tight regulation so that dividing cell's DNA is copied properly, and Incase there is any errors in the DNA, they are effectively repaired, and each of the daughter cell receives a full set of chromosomes.

Ways by which the cell regulate itself are ;

1.) Enzymes Activity:

Enzymes are substance that serve as a catalyst in all living organisms, but at the end they remain unaltered. by regulating the rate at which chemical reactions proceed.

They are responsible for catalyzing aspects of cell metabolism, such as digestion and other cell regulation activities.

2.) Diffusion refers to the movement of a substance from an area of high concentration to an area of low concentration.It occurs in fluids such as liquids and gases simply because of random movement of their particles from place to place. Diffusion is one of the ways by which cell is regulated in living things, it controls how substances move in and out of cells.