the weakest bond between two atoms is the_____________ bond
ionic bonds are formed when
atoms share electrons
ions with a negative charge are called
All of the following are true concerning enzymes, EXCEPT that they (a) function as biological catalysts (b) lower activation energy (c) are proteins (d) are consumed by the reaction.
16. The rate of a chemical reaction is influenced by the (a) temperature (b) presence of catalysts (c) concentration of reactants (d) all of these.
which of the following is not a function of protein (a) support (b) metabolic regulation (c) storage of genetic information (d) transport.
if a substance has a pH that is less than 7 it is:
glucose is stored in liver and muscles in the form of
An example of an inorganic substance is (a) glycerol (b) water (c) fructose (d) all of these.
a fatty acid that does not contain double covalent c=c bonds is called
Most of the fat in the human body is in the form of (a) phospholipids (b) cholesterol (c) triglycerides (d) prostaglandins
Glycoproteins and proteoglycans are combinations of amino acids and (a) fatty acids (b) carbohydrates (b) lipids (d) all of these.
A buffer will (a) make a solution more basic (b) enhance changes in the pH of the solutions (c) resist drastic changes in the pH of the solutions (d) have no effect on the pH of the solutions.
An amino acid is to protein as _____ is to a nucleic acid is to DNA. (a) a purine (b) a nucleotide (c) protein (d) none of these.
RNA differs from DNA in that (a) RNA is single stranded (b) RNA contains uracil and DNA contains thymine (c) RNA contains ribose while DNA contains deoxyribose (d) all of these.
the DNA double helix is held together by
Functions of the plasma membrane include all of the following EXCEPT (a) structural support (b) separation of the cytoplasma from the extra cellular fluid (c) regulation of exchange of material (d) thermal insulation.
the plasma membrane is composed of:
Functions of the glycocalyx include (a) binding extracellular compounds (b) lubricating and protecting the cell membrane (d) identifying the cell to the immune system (d) all of these.
amino acids are brought to the ribosome by
what component of the cytoskeleton moves chromosomes during cell division?
ribosomes are composed of
RNA and protein
the triplet codes needed to specify a polypeptide chain are found in the
The mRNA sequence that is complementary to the sequence ATC on DNA is
Before the mRNA transcribed from a gene can be used for protein synthesis it must be
edited to remove introns, transported to cytoplasm
the construction of a function polypeptide by using mRNA is called
the movement of water across a membrane from low solute concentration to higher solute is called
white blood cells engulf bacteria in the process called
site of lipid synthesis
smooth endoplasmic reticulum
self destruction of damaged cells
mitochondria use _________ to break down food and produce ________.
contents of nucleus (4)
nucleoli nucleosomes chromatin chromosomes
3 bases=1 amino acid
balanced water flow in and out of cell
gain waters could rupture
looses water, shrinks
facilitated diffusion is ___________
what is vesicular transport m
materials move into or out of cell in vescicles endocytosis and exocytosis
what phase does a cell spend the majority of its life in?