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.
D. Hemidesmosomes anchor cells to the ECM while desmosomes anchor cells to other cells.
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It is estimated that less than 4% of all cases of salmonellosis are reported
Indicate whether the statement is true or false.
Why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information?
A. Because without the actions potential, changes in Vm at the stimulus site might not reach the axon terminal B. Because without the sectional potential, the neuron would not depolarise C. Because action potentials help the body keep ion concentrations at appropriate levels D. Because without the action potential, the neuron would not return to resting potential
Which of the following statements about ecological
succession is false? a. A disturbed area within a community may recover quickly if improved soil remains. b. Pioneer species are the start of community structure. c. The wastes and remains of early colonizers favor the survival of new species. d. Secondary succession occurs on a new volcanic island. e. Later successional species outcompete earlier species.
Which phylum includes members that have, at some point during their development, a hollow dorsal nerve cord?
a. Hemichordata b. Arthropoda c. Cnidaria d. Chordata