The evolution of flower symmetry is best explained by
A. a new gene mutation.
B. the modification of an existing gene for a new function.
C. homoplastic convergence.
D. gene duplication and divergence.
E. conserved genes.
C. homoplastic convergence.
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Select all of the following that are valid counterarguments to the idea that evolution is "just a theory."
_____ Scientists use the word theory to describe unifying ideas. _____ Evolution is just a collection of facts without a central theme and this is not a theory. _____ Scientific theories are supported by many types of evidence and no empirical data refutes them. _____ Evolution occurred in the past, but it is not occurring in the present, so it cannot be a theory.
According to the sliding filament model of muscle contraction, a sarcomere contracts when its
A) thick filaments slide across its Z lines. B) thin filaments slide across its Z lines. C) thin filaments slide along its thick filaments. D) thick filaments move closer together.
Which of the following parts of the nervous system is closest to a muscle?
A) neuroglial cell B) interneuron C) motor neuron D) neuron
G1 checkpoint
What will be an ideal response?