Fever developed as part of a viral infection is the result of:
A. cytokines.
B. histamines.
C. the complement system.
D. Both cytokines and histamines.
A
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Which morphological trait evolved more than once in animals, according to the phylogeny based on DNA sequence data found in the figure above?
A) coelom B) bilateral symmetry C) segmentation D) tissue E) protostome development
A woman is diagnosed as having the genetic disease known as Huntington's disease. It is a rare defect
caused by an autosomal dominant allele. The chance for any one of her eggs to carry the gene is a. dependent on the sex of the child. b. 1 out of 3. c. dependent on the genotype of the woman. d. 3 out of 4. e. 0.
Archaeal flagella (archaella) are superficially similar to bacterial flagella, although archaella are much thicker than bacterial flagella.
Answer the following statement true (T) or false (F)
Which of the following statements about cytochrome c is true?
(a) Cytochrome c shuttles electrons between the NADH dehydrogenase complex and cytochrome c reductase complex. (b) When cytochrome c becomes reduced, two cysteines (sulfur-containing amino acids) become covalently bound to a heme group. (c) The pair of electrons accepted by cytochrome c are added to the porphyrin ring of the bound heme group. (d) Cytochrome c is the last protein in the electron-transport chain, passing its electrons directly to molecular oxygen, a process that reduces O2 to H2O.