Which of the following is the best description of a gene?
A) a protein whose amino acid sequence is encoded in a segment of DNA
B) A section of the nucleus where transcription takes place.
C) a segment of mRNA that is translated into a protein
D) a collection of millions or billions of base pairs of DNA, encoding many proteins
E) a segment of DNA that is transcribed into an mRNA, a tRNA, or an rRNA
Answer: E
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The enzymes for cellular respiration in eukaryotic organisms are located within the mitochondria. In prokaryotic organisms, these enzymes are attached to the
A. cell wall. B. cell membrane. C. ribosomes. D. circular DNA. E. nuclear membrane.
Interoctopus communication is facilitated by
A. a radula. B. mantle connections. C. chromatophores. D. chemical pheromones.
If the mitosomes of Giardia contain no DNA, yet are descendants of what were once free-living organisms, then where are we likely to find the genes that encode their structures, and what accounts for their current location there?
A) plasmids; conjugation B) plasmids; transformation C) nucleus; horizontal gene transfer D) nucleus; S phase
Alternation of generations means that a diploid sporophyte produces haploid spores by meiosis and a haploid gametophyte produces gametes by mitosis.
a. true b. false