12 Questions
Why do cells use protein catalysts called enzymes to break covalent bonds?
To decrease the temperature needed to break covalent bonds
What is a characteristic of non-polar covalent bonds?
They form when shared atoms have similar attraction to acquired electrons
What type of bond forms when two atoms share electrons to fill their outermost energy level?
Covalent bond
Why can some atoms, such as carbon, form long chains of atoms to create complex molecules?
As a result of their ability to form multiple covalent bonds simultaneously
How do the hydrogen atoms in a water molecule contribute to its polarity?
They create a positive pole near them and a negative pole on the opposite side
What is the defining characteristic of a polar molecule?
It has a positive charge at one end and a negative charge at the other
What type of bond forms when one of the poles of a water molecule is attracted to an opposite pole on another molecule?
Hydrogen bond
Why is hydrogen bonding considered important in biological molecules like DNA and proteins?
It is strong enough to keep the structure together and weak enough for accessing genetic data
What are the three subatomic particles that make up an atom?
Protons, neutrons, and electrons
What is the relation between the number of protons and the number of electrons in a stable atom?
The number of protons and electrons are always equal
What distinguishes one element from another?
Atomic number
Where are protons and neutrons located within an atom?
In the nucleus
Explore the basic information about atoms, molecules, and macromolecules that are the building blocks of cells in the first week lecture of Human Biology. Understand how cells live, interact with each other and their environment, and know facts about the molecules that compose all living matter.
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