Children with DiGeorge Syndrome are born without a thymus. Discuss, in detail, the repercussions to body defense mechanisms caused by this disease.
What will be an ideal response?
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The evolution of initiation of limb development in tetrapods 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.
Respiratory syncytial virus is one of the most common etiologic agents of lower respiratory tract infection among:
a. previously healthy patients 2 months to 5 years of age. b. adults younger than 30 years of age. c. community-acquired pneumonia in adults. d. school-age children.
198 The planktonic form of cnidarians is called a medusa
Indicate whether the statement is true or false
In thermodynamics, what does the term "free energy" refer to?
A.) energy that can be harnessed to do work or drive chemical reactions B.) energy that cannot be harnessed to do work or drive chemical reactions C.) energy required to initiate a chemical reaction D.) excess energy from a reaction that a cell does not use E.) energy that cells borrow from the environment