At pH 11, a peptide with the sequence G-M-G-V-S-D-P-D-A has the net charge of:
A. -3
B. -2
C. -1
D. +1
E. +2
A
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How do citrus fruits such as lemons cause the basic taste of sour?
A) The more acidic the food is, the more depolarization of the sensory receptor occurs. B) Ascorbic acid binds to sensory receptors on the plasma membrane of taste cells, which leads to the triggering of cellular activity that trigger a sour taste response. C) Sugars and ascorbic acid bind sensory receptors on the plasma membrane of taste cells, which leads to the triggering of cellular activity that trigger a sour taste response. D) Citric acid amplifies the sour taste of vitamin C when it binds to specialized receptors on the taste cells.
NASA Scientists send a small population of dogs to a new planet in order to test if it will be hospitable for human colonization. Through a random lottery, only Great Dane and St. Bernard dog breeds are sent, and the resulting population consists of tall, longhaired dogs. After 100 years these dogs return to Earth and are no longer able to mate with Earth dogs. This scenario is an example of
A. allopatric speciation through genetic drift. B. allopatric speciation through natural selection. C. sympatric speciation through genetic drift. D. sympatric speciation through natural selection. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about genetic drift? Choose Answe · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The period following an action potential during which a neuron cannot be stimulated to generate another action potential is referred to as
A. the refractory period. B. the threshold period. C. the resting period. D. the inactivation period. E. the critical period.
The ureters drain urine into the
a. renal pelvis. b. cecum. c. urinary bladder. d. small intestine.