Trees of life that illustrate the phylogenetic relationships of all organisms were traditionally based on ________; newer methods for determining phylogeny rely on ________.
A. morphology; nutritional requirements
B. nucleic acid sequences; microbiomes
C. nucleic acid sequences; morphology
D. morphology; nucleic acid sequences
E. morphology; virology
Answer: D
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Does the presence of introns/exons in eukaryotic cells provide more potential diversity in gene products (proteins) than is possible in prokaryotic cells?
A. It doesn't-this is a trick question. There's the same potential for gene products (proteins) in a bacterium with 1,000 genes as there is in a eukaryotic cell with 1,000 genes. B. It does-each exon and each intron could be used individually and discretely to make agene product (protein). Since bacteria lack these, they will have less ability to create different proteins. C. It does-exons/introns can be spliced together in different ways post-transcription to yield different mRNAs (and therefore, different proteins). Bacteria lack this system, so the gene you transcribe is translated into the only protein you'll end up getting. D. It does-exons/introns can be spliced together in different ways at the DNA levelto eventually yield different mRNAs (and therefore, different proteins). Bacteria lack this system, so the gene you transcribe is translated into the only protein you'll end up getting.
The muscles of the myometrium:
A. are sloughed off during menstruation. B. create the contractions of labor and orgasm. C. form the external cover of the uterus. D. are very weak and are incapable of expanding
Messenger RNAs that contain no stop codons are eliminated by
A) nonstop decay. B) directed RNase activity. C) nonsense-mediated decay. D) error-mediated repair. E) none of these mechanisms.
Gene therapy for human genetic diseases has not been successful yet
Indicate whether the statement is true or false