Which of the following is not a shape seen in prokaryotes?
A. Spheres
B. Icosahedrons
C. Rods
D. Spirals
Answer: B
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At the beginning of this century there was a general announcement regarding the sequencing of the human genome and the genomes of many other multicellular eukaryotes. Many people were surprised that the number of protein-coding sequences was much smaller
than they had expected. Which of the following could account for much of the DNA that is not coding for proteins? A) most of the DNA serving as origins of DNA replication B) DNA that consists of histone coding sequences C) DNA that is translated directly without being transcribed D) non-protein-coding DNA that is transcribed into several kinds of small RNAs with biological function E) non-protein-coding DNA that serves as binding sites for reverse transcriptase
At a neruomusclular junction involving skeletal muscle, the acetylcholine receptor is a ______ channel.
A. voltage-gated Na+ B. anion C. cation D. two of the above
All chordates have ________
A) a dorsal, hollow nerve cord and a notochord B) a postanal tail and a single opening for the mouth and anus C) a cranium and vertebrae D) pharyngeal slits and a cranium
Proteins are assembled from the instructions found in which molecule?
a. mRNA b. ribosome c. tRNA d. DNA