Which of the following does (or did) not lay an amniotic (enclosed) egg?
a. birds
b. monotreme mammals
c. dinosaurs
d. frogs
e. snakes
D; Frogs lay eggs, but they are coated with jelly and must remain moist. The eggs of all the other groups have shells and membrane that resist water loss and all develop to a miniature adult before hatching.
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Answer the question using the accompanying figure. The muscle indicated by the letter ‘A’ is a(n) ____ muscle
a. flexor b. agonist c. depressor d. antagonist e. extensor
The Drosophila homeotic genes typically contain the homeobox. The homeobox is a sequence of 180 nucleotides. The number of amino acids coded for by this sequence is
A. 180. B. 90. C. 120 D. 60. E. 30.
A lysogenic bacterium causes lysis of other bacteria on contact.
a. true b. false
In pools below waterfalls, where predation is ________, male guppies are ________, whereas in pools above waterfalls where predation is ________, male guppies are ________.
A. high, drab colored, low, more colorful B. low, more colorful, high, drab colored C. high, more colorful, low, drab colored D. low, drab colored, high, more colorful