Question

a substance that accelerates the rate of a chemical reaction is called a(an
catalyst.
lipid.
molecule.
element.

the process by which organisms keep their internal conditions fairly constant is called

homeostasis.
evolution.
metabolism.
photosynthesis.

which of the following is a function of the cytoskeleton?

helps a cell keep its shape
contains dna
surrounds the cell

Explanation:

First Question:

A catalyst is defined as a substance that increases the rate of a chemical reaction without being consumed in the process. Lipids are a type of biomolecule (fats, oils, etc.), molecules are groups of atoms bonded together, and elements are pure substances made of one type of atom. So the correct option is the one with "catalyst".

Homeostasis is the process by which organisms maintain a stable internal environment. Evolution is the change in species over time, metabolism is the sum of chemical reactions in an organism, and photosynthesis is how plants make food. So the correct option is the one with "homeostasis".

The cytoskeleton helps a cell maintain its shape, move, and organize internal structures. DNA is in the nucleus, and the cell membrane (or cell wall in some cases) surrounds the cell. So the function of the cytoskeleton is to help a cell keep its shape.

Answer:

A. catalyst.

Second Question: