topdodendon atomoss oak loss of leaves Figure 2. Use the phylogenetic tree above
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Question
topdodendon atomoss oak loss of leaves Figure 2. Use the phylogenetic tree above to answer questions 4 and 5. 4. In the tree above, assume that the ancestor was an herb (not a tree) without leaves or seeds. Given this, the evolution o tree morphlogy in Lepidodendron, oak and yew: (a) is an example of convergent evolution between Lepidodendron and the oak-yew clade b) is an example of convergent evolution between oak and yew (c) is a homologous trait for oak and yew (d) a and c are correct (e) b and c are 5. In the tree above, assume that the ancestor was an herb (not a tree) without leaves or seeds. Which currently existing species hashave this same combination of traits? (a) fern (b) Psilotuom (c) clubmoss (d) a and c are correct (e) and c are correct b 6. A mature RNA transcript differs from a primary RNA because: transcript (a) Exons are spliced out of the mature transcript (b) Introns are spliced out of the mature transcript (c) Exons are added to the mature transcript (d) Introns are added to the mature transcript Which of the following statements is correct: (a) microRNAs bind DNA and block transcription (b) microRNAs bind mRNA and block translation (c) microRNAs bind ribosomal RNA and block translation (d) All of the above 21 PagExplanation / Answer
Answer:
4. (d)
This is an example of convergent evolution between Lepidodendron and the oak-yew clade and is a homologous trait for oak and yew.
5. (e) Psilotum and clubmoss
Clubmosses are not trees (no leaves). Psilotum lacks leaves, but it is not a tree.
6. (b)
During splicing, introns are spliced out from the mature transcript. The exons come together to form the mature mRNA which codes for the protein.
7. (b)
miRNAs bind to the 3'-UTR (untranslated region) of their target mRNAs and repress protein production by destabilizing the mRNA and translational silencing.
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