Old Exam #1 Bio153 Prins

Which subatomic particle is located in the nucleus of an atom?

a and c (proton and neutron)

Atoms of the same element with different charges are :

ions

Sodium is atomic number 11. If it gives up an electron it will become:

a cation

Elements are identified by their number of :

protons

T or F If two atoms have different atomic numbers, they may be isotopes of each other.

False

Which of these is NOT a main element found in the body?

nitrogen

When two atoms of the same element are bonded, it is called a:

molecule

When two atoms share a pair of electrons equally, it is a ____________ bond:

non-polar covalent

Which of these does NOT influence the rate of a chemical reaction?

all do impact rate (temperature, concentration, catalyst)

Which type of reaction is the following? AB >> A + B

decomposition

The water molecule is held together by ___________ bonds:

polar covalent

Substances that increase the rate of chemical reactions while remaining unchanged are:

a and b (catalysts and enzymes)

A compound that can accept a proton (H+) when placed in water is a:

base

A salt can have which of the following?

K+

Which carbohydrate monomer is the most common in living organisms?

glucose

Which disaccharide is composed of glucose plus galactose?

lactose

Where might we find glycogen in the human body?

a and b (muscle and liver)

Which of these is NOT a function for proteins?

energy storage

T or F The sodium pump moves sodium from a low concentration to a high, but moves potassium from a high concentration to a low concentration.

False

An unsaturated fat has a ___________ bond between at least two carbons.

double covalent

Triglycerides have three fatty acids attached to a _____________ molecule.

glycerol

Steroid molecules are all derivatives of:

cholesterol

Which of these is NOT a function of lipids?

enzymes

Which monomers make up proteins?

amino acids

Which of these is NOT a nucleotide?

DNA

Which of the following is NOT a major component of cell membranes?

amino acids

Which type of junction allows passage between cells (not from the inside of one cell to the inside of another)?

b and c (desmosomes and gap junctions)

Which of these is NOT involved in facilitated diffusion?

ATP

Which of these molecules can cross the membrane by simple diffusion?

water

A cell is placed in a solution. Over time the cell begins to shrink. The solution is:

hypertonic

The sodium-potassium pump (Na-K-ATPase; sodium pump) produces which situation?

high sodium inside, high potassium concentration outside cell

Which type of molecules can diffuse across a lipid bilayer?

lipids

Which organelle is the site of ATP production/energy conversion?

mitochondria

Which organelle is the main site of protein production?

ribosome

What protein is needed to be in the membrane for endocytosis to occur?

clathrin

Which organelle is involved in modifying and packaging molecules for transport within and to the outside of the cell ?

Golgi

Which cytoskeletal elements are composed of tubulin?

microtubles

Which of these is NOT part of the endomembrane system?

all are part of the system (Golgi, ER, nuclear membrane)

Which of these would NOT be a function for a lysosome?

formation of lipids

Where are ribosomes formed?

nucleolus

What is produced in the smooth ER?

lipids

A reaction that requires energy is:

endergonic

T or F The receptors which are linked to "G" proteins both bind to hormones and cause those hormones to enter the cell.

False

T or F Cell membranes have proteins in them, some of which are enzymes.

True

Which is composed of the protein actin?

microfilaments

T or F In CF, a mutation can lead to a change in structure of a chloride channel, making mucous thick.

True

The structural and functional unit of life is:

cell