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Lecture 10: Multicellular Organisms and Bilateral Symmetry in Animals

11 Questions

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Lecture 10: Multicellular Organisms and Bilateral Symmetry in Animals

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Questions and Answers

What role does the arm closest to the threat/opportunity play according to the text?

Observational role

Supporting role

Mediating role

Lead role (correct)

Which system is NOT mentioned as a requirement for the arm to take the lead role?

Non-centralized nervous system

Effector system

Brain system (correct)

Sensory system

What is the function of interneurons in regulating the flow of information?

Initiate motor responses

Regulate the flow of information (correct)

Control sensory input

Speed up synaptic transmission

How is the brain described in bilateral animals according to the text?

Expanded ganglion Signup and view all the answers

What does the text suggest about animals with brains regarding behavior?

They can engage in all recognized forms of behavior Signup and view all the answers

What does bilateral symmetry allow for in multicellular organisms?

Directed movement and tracking Signup and view all the answers

Which evolutionary term is used to describe the combination of biology and development when discussing the origins of bilateral symmetry?

Evo-devo Signup and view all the answers

In protostomes, which opening becomes the mouth during development?

Blastopore Signup and view all the answers

Why does bilateral symmetry allow for concentration of neural tissue and sensory systems at one end in flatworms?

To enable directed, targeted movements Signup and view all the answers

What leads to the unique Bauplan of each animal phylum?

Combination of symmetry, tissue types, body cavities, and other traits Signup and view all the answers

'Proves' comes from the Latin ‘provare’, meaning 'to test or try'. What does this original meaning suggest about 'the exception that proves the rule' saying?

'The exception that confirms or tests the rule' Signup and view all the answers