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WorksheetsMid term Bio 101
Total questions: 17
Worksheet time: 9mins
Which structure is not part of the endomembrane system?
nuclear envelope
chloroplast
Golgi apparatus
plasma membrane
Which structure is common to plant cell and animal cell?
chlorplast
wall made of cellulose
mitochondrion
centroile
Which of the following is present in a prokaryotic cell?
mitochondrion
ribosome
nuclear envelope
chloroplast
Cyanide binds to at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide will be found within the
mitochondria
ribosomes
peroxisomes
lysosomes
What cell will be best for studying lysosomes?
muscle cell
nerve cell
phagocytic white blood cell
bacterial cell
In what way do the membranes of a eukaryotic cell vary?
Phospholipids are found only in certain membranes.
Certain proteins are unique to each kind of membrane
Only certain membranes of the cell are selectively permeable
Only certain membranes are constructed from amphipathic molecules
Which of the following factors would tend to increase membrane fluidity?
a greater proportion of unsaturated phospholipids
a greater proportion of saturated phospholipids
a lower temperature
a relatively high protein content in the membrane
Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because
they are species specific
they always lead to the same cellular response
they amplify the original signal manyfold
they counter the harmful effects of phosphates
Lipid-soluble signaling molecules, such as aldosterone, cross the membranes of all cells but affect only target cells because
only target cells retain the appropriate DNA segments
intracellular receptors are present only in target cells
only target cels have enzymes that break down aldosterone
only in target cells in aldosterone able to initiate the phosphorylation cascade that turns genes on
Which of the following process includes all the others?
osmosis
diffusion of a solute across a memberane
passive transport
transport of an ion down its electrochemical gradient
Which of these experimental treatments would increase the rate of sucrose transport in a plant cell?
decreasing extracellular sucrose concentration
decreasing extracellular pH
decreasing cytoplasmic pH
adding a substance that makes the membranes more permeable to hydrogen ions
Choose the pair of terms that correctly complete this sentence:
Catabolism is to anabolism as _ is to _.
exergonic; spontaneous
exergonic; endergonic
free energy; entropy
work; energy
Most cells cannot harness heat to perform work because
heat does not involve a transfer of energy
cells do not have much heat; they are relatively cool
temperature is usually uniform throughout a cell.
heat can never be used to do work
Which of the following metabolic processes can occur without a net influx of energy from other processes?
ADP + Pi -> ATP + H2O
C6H12O6 + 6O2 -> 6CO2 + H2O
6CO2+ 6H2O -> C6H12O6 + 6O2
Amino acids -> Protein
If an enzyme in solution us saturated with substrate, the most effective way to obtain a faster yield of products of products is to
add more of the enzyme
heat the solution to 90 degree Celsius
sdd more substrate
add an allosteric inhibitor
Some bacteria are metabolically active in hot springs because
they are able to maintain a lower internal temperature
high temperatures make catalysis unnecessary
their enzymes have high optimal temperatures
their enzymes are completely insensitive to temperature
If an enzyme is added to a solution where its substrate and product are in equilibrium, what will occur?
Additional product will be formed.
The reaction will change from endergonic to exergonic
The free energy of the system will change
Nothing: the reaction will stay at equilibrium.
