You have arrived home and you flip on a light switch. The light does not come on. You immediately wonder why. Which step of the scientific method is this?
a. Form a hypothesis.
b. Make a prediction.
c. Make an observation.
d. Analyze the results.
c. Make an observation.
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Stable isotope analysis to indicate whether or not certain elements have been processed by an organism is based on the observation that
A. microbes generally prefer using the lighter of two stable isotopes. B. microbes have no preference as regards heavy versus light isotopes. C. microbes generally prefer using the heavier of two stable isotopes. D. None of the choices are correct.
Protective layers outside the bacterial cell membrane include:
a. cell walls only b. capsules only c. envelopes only d. cell walls and plasmids e. cell walls and capsules
Comparing cells synthesizing secretory proteins and cells secreting steroid hormones, the cells synthesizing the steroid hormones have
A) more rough ER. B) more smooth ER. C) equal amounts of smooth and rough ER. D) equal amounts of smooth and rough ER, but more lysosomes. E) equal amounts of smooth and rough ER, but fewer lysosomes.
Which of the following is incorrect about termination codons?
A. Termination codons include UAA, UAG, UGA. B. Termination codons do not have corresponding tRNA. C. They are also called nonsense codons. D. Termination codons include AUG. E. They occur where the bond between the final tRNA and the growing polypeptide is broken.