Exam 1 Test Questions
Lipids serve to
Insulate, protect, and store energy
The type of bond that will form from the transfer of an electron from one atom to another is an
Ionic bond
The term metabolism refers to
All the chemical reactions in a cell
The pH of 3.5 is called
An acid
What does not occur when a sodium atom transfers an electron to a chlorine atom?
They do not share electrons between them
4 categories of biomolecules are
- Carbohydrates - Lipids - Proteins - Nucleic acids
Biological levels from the least to most complex
- Molecule <- least - Cell - Tissue - Organ - Organ system - Organisms <- most
What does occur when a sodium atom transfers an electron to a chlorine atom?
- Sodium becomes a positively charged ion - The positive and the negative ion will attract each other forming a crystal if no water is present - The ions will separate on the presence of water
Oxygen has how many protons?
8 protons and an atomic number of 8
The 4 major classes of biological macromolecules are
Carbohydrates, lipids, proteins, and nucleic acids
The smallest unit of life is a
Cell
Nucleic acids include
DNA and RNA which control our genetic inheritance
An covalent bond occurs when
Electrons are shared between 2 atoms to complete their octate
Carbohydrates are used by the body for
Energy
According to the octate rule an atom is most stable when
Its outer valence shell contains 8 electrons
In animals lipids are used for
Long term energy storage
After spending an hour working in the hot sunny weather, a person perspires (sweats) and drinks water. This is an example of
Mainting homeostasis
RNA and DNA are both examples of a
Nucleic acid
A group of organisms of the same species in a particular area is the
Population
The particles that are found in the nucleus of an atom are the what?
Protons and neutrons
The tiny leaves of a plant close when they are touched is a
Response to their environment
Plants store their sugar in the form of
Starch
Which of the following statements correctly identifies the type of bond found between oxygen and hydrogen in water molecules?
The bond has an unequal sharing of electrons. Polar covalent bonds
You're conducting an experiment that determines if echinacea cures the common cold. What would be the best experimental setup to test this hypothesis?
The experimental group receives a daily dose of echinacea and the control group receives a sugar pill to look like echinacea
A team of researchers are investigating a new carbon rich molecule important to life. They find evidence for the presence of a long carbon hydrogen containing chain that has a double bond between carbon atoms. This observation means that
The new molecule likely exists as an unsaturated fatty acid
Biomolecules that form many functions for many things and are made up of amino acids are called
protein