An oocyte is fertilized in the
a) vagina
b) uterus
c) uterine tubes
d) ovary
Ans: c) uterine tubes
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Some breeds of dogs that are specialized to retrieve objects from bodies of water have webbing between their toes. A change in what cellular response to positional information during digit formation could account for this morphological feature?
A. Signals that cause differentiation to toes are not received by cells that become webbing. B. Signals to cause apoptosis are not received by cells that become webbing. C. Cells between the future digits migrate, but do not divide once they are in the region that will become toes. D. Cells between the future digits divide, but do not migrate to the region that will become toes. E. Cells between the future digits do not divide before migrating to the region that will become toes.
The profundal zone is indicated by
a. A. b. B. c. C. d. D. e. none of these.
Choose the item in column 2 that best matches each item in column 1. You may use a column 2 item more than once
A) active transport and indirect active transport B) simple diffusion and facilitated diffusion C) active transport D) none of the listed processes E) simple diffusion F) facilitated diffusion and active transport G) facilitated diffusion (passive transport) H) indirect active transport 1) requires direct ATP hydrolysis 2) depends on high partition coefficient of the solute 3) driven by an ion gradient 4) transports glucose across membranes 5) Na+/glucose symport 6) Na+/K+ ATPase pump 7) transports small, nonpolar molecules 8) transports ions up concentration gradients 9) transports water across membranes 10) direction of transport depends on the concentration gradient 11) requires ligand binding and therefore Km for transport can be calculated
Which is NOT true concerning neurotransmitters?
a. They are chemicals found in the axon terminals b. They bind to receptors on the axon terminals c. They are removed from the synaptic cleft by reuptake or by enzymatic breakdown d. They carry the nerve message on to the postsynaptic neuron