The human appendix is an example of a(n) ________ organ, reflecting our evolutionary past.
Fill in the blank(s) with the appropriate word(s).
vestigial
The human appendix is an example of a vestigial organ, reflecting our evolutionary past.
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If the activity of the sodium-potassium pump was completely stopped, what would happen to the neuron's membrane potential?
A) immediate loss of resting potential B) immediate loss of action potentials C) slow decrease of resting potential D) no effect
To identify genes coding for essential proteins, researchers can create temperature-sensitive mutations. These mutations allow proper protein folding and cell proliferation at the permissive temperature of 22ºC, but they cause protein misfolding and reduced cell proliferation at a higher restrictive temperature, such as 37ºC. Which of the following mutations might increase protein flexibility and lead to a temperature-sensitive phenotype?
A.) mutation of a lysine (that was involved in an ionic bond with a glutamic acid) to a glycine B.) mutation of a bulky isoleucine that was buried in the protein interior to a glycine (side chain=H) C.) mutation of a alanine to a cysteine, leading to the formation of a new disulfide bond
Which of the following supposedly speeds the removal of lactic acid from contracting muscles?
a. Caffeine b. Growth hormone c. Phosphate loading d. Bicarbonate loading
True or False: Upper respiratory pathogens are generally more deadly than lower respiratory pathogens
a. TRUE b. FALSE