Two Drosophila are crossed several times, with the
total number of offspring being 106 females and 48
males. There is too great a deviation from the
expected 1:1 ratio for chance alone to account for the
difference. What other factor could account for this
difference? What will be an ideal response?
Answer: a sex-linked recessive lethal gene expressed in the males,
who received it from their mothers
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Each amino acid is specified by a set of ___________ base(s) in mRNA.
(a) one (b) two (c) three (d) four
While lying awake in bed, you stare at your ceiling, watching a faint sparkling, shimmering movement in the pitch darkness around you. What causes this phenomenon in the absence of visible light?
a. Myopia makes near infrared light perceivable. b. The cosmic microwave background is faintly visible. c. Tonic activity generates illusory visual activity. d. Degeneration of the optic nerve creates false images.
Fluorine has an atomic number of 9. Which of the following would you do to a neutral fluorine atom to complete its valence shell?
A) add 1 electron B) add 2 electrons C) remove 1 electron D) Nothing. If fluorine is neutral, it has a complete valance shell.
Integral proteins with carbohydrates (sugars) attached that stick out on the exterior surface of cello membranes help recognize "self" and are called ______________.
a) amino acids b) lipoproteins c) glycoproteins d) monosccharides