A student is designing an experiment to show the effects of the movement of water across a selectively permeable membrane. He places a highly concentrated saltwater solution into a bag that is permeable only to water
He then submerges the bag into a beaker of pure water. Which one of the following can be expected? A) The net flow of water will be from the bag to the surrounding water.
B) The pH of the contents of the bag will increase over time.
C) The volume of the bag will decrease over time.
D) The net flow of water will be from the beaker into the bag, causing the contents of the bag to increase in volume.
E) In this situation, the flow of water into the bag will never equal the flow of water out of the bag.
D
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Which of the following statements comparing hemidesmosomes with desmosomes is TRUE?
A. Hemidesmosomes are anchorage junctions but desmosomes are not. B. Hemidesmosomes interact with actin filaments while desmosomes interact with intermediate filaments. C. Both hemidesmosomes and desmosomes associate with integrin, but not cadherin molecules. D. Hemidesmosomes anchor cells to the ECM while desmosomes anchor cells to other cells. E. Hemidesmosomes are found in plant cells while desmosomes are found in animal cells.
A cell that lacks the ability to make DNA repair enzymes will
A) be unable to replicate its DNA. B) replicate its DNA as rapidly as a normal cell, but the resulting DNA will have more errors in it. C) replicate its DNA as well as a cell with intact repair enzymes. D) be able to correctly replicate its DNA, but it will need more time to do so.
Termination of RNA synthesis is ultimately determined by
A) exhaustion of RNA polymerase activity. B) special protein factors. C) terminases. D) specific nucleotide sequences on the template strand.
Substrate-level phosphorylation transfers
phosphate groups from a. substrate. b. coenzyme. c. the electron transfer chain. d. ATP. e. the Krebs cycle.