Which clinical feature in a newborn baby girl suggests the possibility of Turner syndrome?
A. Absence of Babinski reflex
B. Presence of a webbed neck
C. Presence of epicanthal folds
D. Absence of irises of both eyes
B) presence of a webbed neck
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The term haploid refers to having
a. one quarter of the normal amount of chromosomes. b. half of the normal amount of chromosomes. c. the normal amount of chromosomes. d. twice the normal amount of chromosomes
The normal pH of blood and other fluids is
a. 6.5?6.9. b. 6.92?7.11. c. 7.12?4.28. d. 7.37?7.43. e. 7.43?7.51.
The mitochondrial cristae are an adaptation that
A) helps mitochondria divide during times of greatest cellular respiration. B) increases the space for more copies of the electron transport chain and ATP synthase complexes. C) allows other ions (like Na+) to build up when H+ ions are not available. D) carefully encloses the DNA housed within the mitochondrial matrix. E) permits the expansion of mitochondria as oxygen accumulates in the mitochondrial matrix
Imagine that a Toll-like receptor (TLR) gene has duplicated and mutated, creating a leucine-rich region binding pocket that can now bind to the hemagglutinin protein in the envelope of influenza virus. What do you predict will happen to this novel gene?
A. It will be selected for and over evolutionary time will become an even better receptor for HA protein. B. It will continue to mutate, perhaps changing to bind other proteins or becoming deleted. C. It will spread from species to species. D. It will undergo VDJ rearrangement.