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WorksheetsChemistry of Life
Total questions: 13
Worksheet time: 7mins
What distinguishes elements from compounds?
Elements can be broken down into two or more compounds.
Elements have only one kind of atom and cannot be broken down any further.
Elements do not combine with compounds.
Elements do not react with other elements.
Ionic bonds are formed when:
one atom transfers an electron from its outer shell to another atom.
two atoms share one or more pairs of electrons.
two anions meet.
two elements are dissolved in water.
_______________ are formed when two atoms share one or more pairs of electrons.
Hydrogen bonds
Ionic bonds
Covalent bonds
Unbreakable bonds
The basic building blocks of protein molecules is are:
carboxyl groups
amino acids
enzymes
nitrogen atoms
Non-essential amino acids:
Can be manufactured by the body itself, and do not need to be obtained through diet.
Cannot be manufactured by the body, and therefore must be obtained through diet.
Are not required for most metabolic functions to occur.
Are not required to build bones and teeth.
How do cells obtain energy?
Energy is made in the liver and released into the blood for the cells to use.
Cells break down protein molecules.
Energy stored as fat is released into the blood.
Energy is released by breaking phosphate bonds in ATP molecules
A substance with a pH value of 5 is an:
Acid
Base
Neutral substance
Ionic substance
Amino acids link together through:
protein bonds
ionic bonds
hydrogen bonds
peptide bonds
An atom is stable when the outer shell contains how many electrons?
Four
Six
Eight
Twelve
How do cells obtain energy?
Cells break bonds in ATP molecules.
Cells break down protein molecules.
Energy stored as fat is released into the blood.
Energy is made in the liver and released into the blood for the cells to use.
How do mixtures differ from compounds?
Mixtures are new substances with properties unlike the properties of the elements in the mix.
Mixtures are either liquid or solid, whereas compounds are solid, liquid, or gas.
Mixtures are not combined chemically.
Mixtures cannot be separated by physical means, such as filtering.
The four main organic compounds in the human body are
carbohydrates, bile acids, lipids, and proteins.
carbohydrates, nucleic acids, proteins, and lipids.
calcium carbonate, protein, carbohydrates, and hemoglobin.
hemoglobin, nucleic acids, carbohydrates, and protein.
Which of the following is a function of proteins in the human body?
Serving as the main source of energy
Providing structural support to cells and tissues
Forming the cell membrane bilayer
Storing genetic information
