Prokaryotic cells lack:

A) cytoplasm.
B) organelles.
C) replicator molecules (i.e., DNA or RNA).
D) cell membranes.
E) metabolism.


B) organelles.

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology