Which structures are found in animal cells?A.
lysosome

B.
cell wall

C.
cilia

D.
chloroplast

Final answer:

Not all cells are surrounded by a cell wall. Though cell walls are found in plants, fungi, bacteria, and some protists, animal cells lack them. Thus, the statement 'all cells are surrounded by a cell wall' is false.

Explanation:

The statement that 'all cells are surrounded by a cell wall' is false. While it's true that many types of cells do have cell walls, such as those found in plants, fungi, bacteria, and some protists, not all cells do. A prime example of this is animal cells, which lack cell walls. Instead, they are surrounded by a plasma membrane and sometimes an extracellular matrix that provides structural support and signals cellular function.

Cell walls are essential for many cells as they provide a protective layer, giving shape and rigidity, preventing osmotic lysis, and offering support against environmental stresses. The composition of these cell walls can vary greatly, depending on the type of cell. For instance, cell walls can be made of materials like cellulose (in plants and fungi), chitin (in fungi), or various substances in protist and algae cells)

However, even though some cells have cell walls, remember that not all do. So, it's inaccurate to state that every cell has a cell wall surrounding it.

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Answer:

Anorexia nervosa

Explanation:

• Anorexia nervosa is characterized by a strong desire to lose weight due to the fear of becoming thin.
• Here the person is on a low caloric restriction diet, and the person often assumes that he/she is overweight even though the person is underweight.
• In the given situation, Katie is skipping meals and throwing away food and constantly losing weight, all these are the characteristic symptoms of anorexia nervosa as described above.

Answer: Mutations are the most fundamental way to add new genes to a gene pool.

Explanation:

A mutation is either permanent or temporary changes that may occur in the DNA sequence of the organism that makes up a gene which is the functional unit in the organism. These mutations will add genetic variations in the gene pool of the population. Those mutations which are hereditary which means they can be transmitted from parents to offsprings are called as germline mutations.  

Acquired (somatic) mutations are those mutations which occur's during a persons life. These mutations occur due to ultraviolet radiations. These mutations occur in the somatic cells not in the germ cells therefore, these cannot be passed from one generation to the next.