Chemistry Check
Questionario a risposta multipla di chimica

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1- Monosaccharides are:
a) hydrocarbons
b) flatty acids
c) derivatives of glycerol
d) -carbohydrates
2- Which of the following substances performs the function of coenzyme?
a) Amino acid
b) -Vitamin
c) Hormone
d) Disaccharide
3- Which of the following microrganisms are characterized by the absence of a membrane around their nucleus?
a) Algae
b) Moulds
c) -Bacteria
d) Protozoa
4- The following microorganisms are characterized by the presence of a membrane around the nucleus:
a) -Algae, fungi, moulds and protozoa.
b) Algae, fungi, moulds and bacteria.
c) Algae, fungi, protozoa and bacteria.
d) Algae, moulds, protozoa and bacteria
5- Potable water is:
a) Rich in fecal coliforms.
b) The product of a secondary sewage treatment plant.
c) Water rich in viruses.
d) -Water that is fit to drink (safely).
6- Water containing coliforms...
a) always contains pathogens
b) -can contain pathogens
c) never contains pathogens
d) surely contains pathogens
7- What do the atoms of the same group have in common?
a) -The same outer electronic structure
b) The same atomic number
c) The same number of the electrons
d) The same electronic structure
8- The atomic number is
a) the sum of the protons and neutrons in the nucleus
b) the sum of the protons and the electrons
c) -the number of protons in the nucleus
d) the number of neutrons in the nucleus
9- An atom becomes an ion by
a) gaining or losing protons
b) -gaining or losing electrons
c) gaining or losing neutrons
d) gaining or losing mass
10- The ionization potential of an atom is defined as:
a) the energy produced after the acquisition of an electron
b) a measure of the tendency to attract an electron
c) -the energy required to remove an electron
d) a measure of the capacity to irradiate energy
11- Isotopes are two or more atoms of the same element having...
a) the same atomic number but different number of electrons.
b) the same mass number but different atomic number.
c) -the same atomic number and different mass number.
d) the same mass number and atomic number.

© Nino Vessella , 1996-.
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