A scientist is examining motile protist. He wishes to determine their direction of movement. Which of the following microscopic techniques is least likely to be used to view these cells?
A) light microscopy
B) electron microscopy
C) differential interference contrast microscopy
D) fluorescence microscopy
E) phase-contrast microscopy
Answer: B
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What does the term theory mean to a scientist?
A. A proposed explanation for an observed phenomenon B. A hypothesis that has been supported by a large number of experiments C. A hypothesis that has been supported by the evidence of one experiment D. A guess
Nearsightedness is dominant to normal vision and hazel eyes are dominant to blue eyes. A nearsighted woman with hazel eyes who is heterozygous for both traits marries a man with normal vision and hazel eyes. His genotype for eye color is the same as his wife's. Their three children all have blue eyes and normal vision. What is the probability that their next child will have blue eyes and be
nearsighted? A. 1/4 B. 1/2 C. 3/8 D. 1/8 E. 5/8
Which one of the following statements describes the process through which a primary RNA transcript becomes a functional mRNA?
A) Sections of the primary transcript called exons are removed, and the sections that remain are spliced together. B) Sections of RNA called exons are added to the primary transcript. C) A primary transcript needs no editing and is immediately ready to function as mRNA. D) Noncoding sections of the primary transcript, called introns, are removed, and the remaining coding sections, called exons, are spliced together. E) Random sections of the primary transcript called exons are replaced with sections called introns.
Why is it an advantage for animals that migrate long distances to store energy as lipids rather than carbohydrates?
What will be an ideal response?