Large or polar hormones cannot enter a cell directly. What molecule can act as a second messenger for such hormones?
A. Cyclic AMP
B. Epinephrine
C. Calcitonin
D. Catecholamine
E. Norepinephrine
Answer: A
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A heart rate above 100 beats per minute is known as ____
a. bradycardia b. arrhythmia c. tachycardia d. atrial fibrillation e. ventricular fibrillation
Which organelles supply energy (ATP) to plant cells?
A.) ribosomes B.) centrosomes C.) mitochondria D.) vacuoles
In some ciliate protozoa, the codons UAA and UAG encode glutamate, rather than acting as STOP codons. How does this compare to other species?
A. This is unusual – almost all species share the same “universal” genetic code. B. This is typical – every species has its own unique genetic code. C. This is not unusual – while most species have a similar genetic code, there are often variations for some of the amino acids. 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 the genetic code? Choose Answer · 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?
Gene duplications
a. have proved to be adaptive in some cases. b. have resulted in many slightly different hemoglobin molecules in primates. c. always have negative consequences. d. can occur via unequal crossovers at prophase I. e. are all of these EXCEPT “always have negative consequences.”