1. Which model organism would be the best choice for studying whether 100 different teratogens affect hair development?

[answerhappygod]

1. Which model organism would be the best choice for studying
whether 100 different teratogens affect hair development?
a. mouse
b. chicken
c. Xenopus
d. zebrafish
2. A scientist does an experiment to determine how the axon
of particular type neuron is guided to a target cell. She places
the neuron in a dish with semaphorin on one side. She knows that
this type of neuron does NOT express neuropilins. How would you
predict it would grow?
a. It would grow away from the semaphorin
b. It would grow toward the semaphorin
c. It would likely not grow at all
d. It would likely grow in random directions