Which of the following do unicellular organisms need from a cell signalling system
A. Communicate with other tissues
B. organise and coordinate internal events
C. Sense and respond to the external environment
D. sense and respond to internal events
Ans:
B. organise and coordinate internal events
C. Sense and respond to the external environment
D. sense and respond to internal events
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Match the following descriptions with the specific type of cellular junction listed below. Descriptions may be used more than once or not at all
a. junctions that anchor cells to one another or the ECM b. junctions that permit communication between cells c. junctions that form a seal or a barrier between cells d. junctions that anchor cells to other cells e. junctions that anchor cells to the extracellular matrix 1. Adherens junctions 2. Tight junctions 3. Gap junctions 4. Desmosomes 5. Plasmodesmata 6. Hemidesmosomes What will be an ideal response?
Select all of the following that can result in homoplasies.
_____convergent evolution _____evolutionary reversals _____ divergent evolution _____ shared ancestry
Where is a chemical synapse NOT found?
a. between two neurons. b. between a neuron and a muscle fiber. c. between a neuron and a gland. d. between a neuron and a capillary. e. chemical synapses are found between all of these.
Because history and geography affect the diversification of species, it may be difficult to interpret patterns of diversity solely in terms of local environmental conditions.
a. true b. false