Which of the following is NOT a function of slimy mucilage in microbes?
A. protects against the host's immune system
B. binds nutrients
C. serves as a flotation device
D. prevents desiccation (drying out)
E. protects against ultraviolet radiation
E. protects against ultraviolet radiation
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Echinoderms are members of the Bilateria but many members of the group (e.g., the sea stars) lack a brain, have no specialized sense organs, and have radial nerves that extend down each "arm" from a central nerve ring that surrounds the gut
What was a likely selective pressure in the evolution of this type of nervous system? A. ability to move forward B. role as a predator in the ecosystem C. multicellularity D. possession of an endoskeleton of calcium carbonate E. None of the above.
The most significant cells in graft rejection are
A. helper T cells. B. suppressor T cells. C. cytotoxic T cells. D. natural killer (NK) cells. E. delayed hypersensitivity T cells.
Although it is too simple an explanation, the concept of a key fitting into a lock is descriptive of the:
a. inhibition of enzymes by small molecules b. fit of coenzymes to enzymes c. matching of enzyme with substrate d. regeneration of ATP from ADP e. stepwise cascade of electrons in the oxidation-reduction reactions
Discuss how the therapy for PKU would be different if the disease was not caused by the essential amino acid
phenylalanine, but rather by a non-essential amino acid. Would the disorder be potentially more or less life-threatening? Explain your reasoning. What will be an ideal response?