Acids and bases

How does a base differ from an acid?

Acids are chemical compounds that release hydrogen ions (H+) when placed in water.​

Bases are chemical compounds that attract hydrogen atoms when they are placed in water.

Element

What is the smallest particle of an element?

What is the smallest particle of an element that has the chemical characteristics of that element?

An atom is the smallest particle of an element that has the chemical characteristics of that element. An element is composed of atoms of only one kind. For example, the element carbon is composed of only carbon atoms, and the element oxygen is composed of only oxygen atoms.

Definition 3

A protein catalyst that increases the rate at which a chemical reaction proceeds without the enzyme being permanently changed is called

An enzyme is a protein catalyst that increases the rate at which a chemical reaction proceeds without the enzyme being permanently changed. ​

Amino acids

How many amino acids could take part in construction of proteins?

20 amino acids are involved in protein building.

Nucleic acid

Nucleic acid monomers are

The monomers of nucleic acids are nucleotides.

Water 2

Water plays an important role in the flow of substances into the cell and removing waste products from it. What is the main function of water?

Water is the best solvent in cells.

Nitrogen

Living organisms require nitrogen, as it is

Nitrogen is the main component of amino acids from which proteins are formed.

Mineral substances

Mineral substances in the body are not involved in

The energy is released by the oxidation of glucose, while the minerals are involved in all the other processes listed.

Water 3

Which substance in the cell performs the function of a solvent?

Water is the universal solvent of substances in the cell.

contraction of skeletal muscles

Which ions affect the contraction of skeletal muscles?

A key role in the regulation of muscle contraction belongs to calcium ions (Ca2+). The myofibrils have the ability to interact with ATP and to decrease in the presence of certain concentrations in the medium of calcium ions.

hydrophobic compounds

Which of the following are hydrophobic compounds?

Hydrophobic substances are not soluble in water. From this list only fats (lipids) are not soluble.

enzymatic function

The enzymatic function in a cell belongs to

Lipids are a part of the membrane and are involved in the selective permeability of the membranes, carbohydrates work for oxidation and the formation of ATP molecules, nucleic acids store and transmit the genetic information and proteins include enzymes thus operating enzymatic function.

Name the molecule

Name the molecule that is part of the cell and contains carboxyl and amino-groups.

Amino acids contain amino and carboxyl groups in their composition.