Atom Awareness
Which part of an atom has a negative charge and essentially no mass?
electron
When atoms equally share electrons, they form a _________.
non-polar covalent bond
The ability of water molecules to stick to each other and create surface tension is called ______.
Cohesion
This type of lipid is made of closed rings and is the basis for many hormones in the body.
Steroid
What is the monomer of proteins?
Amino Acid
The first energy shell can hold ____ electrons, and additional shells can hold _____ electrons.
2, 8
Table salt (NaCl) is an example of which type of chemical bond?
Ionic
TRUE or FALSE: Adhesion is the ability of water molecules to stick to nonpolar surfaces.
False
Lipids are considered to be:
- polar
- nonpolar
- multipolar
Non-polar
A long chain of amino acids is called a ___________.
polypeptide
How do we determine the atomic mass/weight of an atom?
# of protons + # of neutrons
_____ is an example of a molecule that forms _______ bonds where electrons are not shared equally.
Water, polar covalent
Which of the following is the MOST dense form of water?
1. warm water
2. cold water
3. frozen water
2. cold water
What are the two major parts that make up a triglyceride?
Glycerol and Fatty Acids
TRUE or FALSE: All proteins have quaternary structure
FALSE
What is an atomic isotope?
An atom of the same element with a different number of neutrons
Which type of chemical bond is considered the "weakest"?
Hydrogen bonds
_______ substances dissolve easily in water.
Polar
These types of fatty acids have at least one double bond between carbons and are liquid at room temperature.
Unsaturated
Which level of protein structure consists of alpha helices and beta pleated sheets?
Secondary
Which 6 elements make up the majority of the weight of living organisms?
C, H, O, N, P, S
This feature of an atom tells us how much the atom wants an electron
electronegativity
What is the pH of pure water?
7
The cuticle on plant leaves is considered an example of which type of lipid?
Wax
Name two (2) of the six major functions of proteins.
Metabolism, Support, Transport, Defense, Regulation, Motion