Prokaryotic cells lack:
A) cytoplasm.
B) organelles.
C) replicator molecules (i.e., DNA or RNA).
D) cell membranes.
E) metabolism.
B) organelles.
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The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA _____
A) is a six-carbon sugar and the sugar in RNA is a five-carbon sugar B) can form a double-stranded molecule C) is an aldehyde sugar and the sugar in RNA is a keto sugar D) is in the ? configuration and the sugar in RNA is in the ? configuration E) contains one less oxygen atom
The product of the bicoid gene in Drosophila provides essential information about _____
A) lethal genes B) the dorsal-ventral axis C) the left-right axis D) segmentation E) the anterior-posterior axis
How do ray-finned fish keep from sinking?
a. they are constantly swimming b. their fins are constantly moving c. they have lungs that are always filled with air d. they have a swim bladder that is filled with gas e. they have a skeleton that is less dense than the surrounding water
What is the correct order of steps of morphogenesis in Drosophila melanogaster?a. Gap genes divide the body into broad regionsb. Establishment of anterior / posterior axesc. Homeotic genes determine which body parts arise from each regiond. Pair-rule genes are activated in order to develop a preliminary segmentation pattern
A. a - b - c - d B. a - d - c - b C. a - d - b - c D. b - a - d - c E. b - a - c - d