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48 terms

anatomy-Exam 1

-Exam
STUDY
PLAY
the transfer of information from DNA to messenger RNA(mRNA) is known as
transcription
messenger
is synthesized when a portion of a DNA molecule is transcribed
which of the following sequence is correct?
transcription>translation>protein synthesis
a DNA base sequence is A T G C C G. the sequence of bases in a strand of mRNA transcribed from this sequence of bases in DNA would be
U A C G G C
the function of the Golgi apparatus is
a packaging and distribution of proteins and lipids
endoplasmic reticulum with ribosomes attached to it is called
rough ER
if a toxic drug inhibited mRNA synthesis, which of the following would be most directly affected?
protein synthesis
the control center of the cell is the
nucleus
the movement of molecules against their concentration gradient is called
active transport
the movement of substances from areas of high concentration to areas of less concentration
diffusion
pinocytosis
involves ingestion of liquids rather than particles
certain cells in the liver ingest bacteria and debris from damaged cells by a process called
phagocytosis
the sodium-potassium exchange pump located in the plasma membrane
actively transports potassium into cells
active transport
requires energy
the greater the concentration of a
osmotic pressure of the solution
solution A contains 5 grams of sugar per liter while solution B contains 2 grams of sugar per liter. The solutions are separated by a selectively permeable membrane. if the solvent in both solutions is water, predict in which direction most of the water molecules will move
move by osmosis from solution B to solution A
osmosis is the diffusion of_____across a selectively permeable membrane
water
a group of cells was treated with a proteolytic(protein-digesting)enzyme. which of the following processes would be least affected by this treatment
diffusion of lipid-soluble molecules through the plasma membrane
the plasma membrane is selectively permeable. this means
only certain substances can pass through it
what type of membrane proteins have an exposed site on the outer cell surface that can attach to a ligand
receptor proteins
cells that respond to ligands
a possess receptor sites for specific ligands
channel proteins
provide a "door" through which extracellular molecules can enter the cell
which of the following activities is a function of the plasma membrane
cell metabolism
membrane proteins that extend into the lipid bilayer are called
extrinsic proteins
fatty acid A has double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain
fatty acid B is saturated
which of the following organic groups does DNA belong to
nucleic acid
what is the building molecule of proteins
amino acid
proteins
provide much of the structure of the body cells and tissures
the building blocks of proteins are
amino acids
large carbohydrates contain units called
monosaccharides
normal blood pH is maintained within a range of
7.35-7.45
a buffer will
resist drastic changes in the pH of the solutions
solution A has a pH of 10 and solution B has a solution of 2. which of the following statements about these solutions is true
solution B has a higher hydrogen ion concentration than solution A
the pH value
is determined by the concentration of hydrogen ions
solution A increases its acidity. this means that the
number of hydrogen ions has increased
which of the following statements is false
water evaporation heats the body
the presence of water in or bodies allows us to
all of these are correct (cool the body with sweat, maintain a fairly constant body temperature, provide an environment for chemical reactions, and keep tissues moist and reduce friction
when ionic compounds dissolve in water,their ions
dissociate or separate from one another
isotopes of the same element have
the same atomic number but differ in their mass numbers
electrons
are the subatomic particles most involved in bonding behavior of atoms
a neutral atom will become a cation if it
loses electrons
the four most abundant elements in the human body are
carbon, hydrogen, oxygen, and nitrogen
which of the following is most inferior in location
pelvic cavity
medial means
toward the middle or midline of the body
which plane divides the body into equal right and left halves
median
a vertical plane that separates the body into right and left portions is called____plane
sagittal
amputation of a foot at the ankle would involve a cut in the _____plane
tranverse
the thoracic cavity is separated from the abdominal cavity by the
diaphragm