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10 Cards in this Set
- Front
- Back
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The discovery of ribozymes provide evidence that life on the early Earth may have been based on: a) DNA b) proteins c) RNA d) lipids e) polysaccharides |
C. RNA |
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Which of these best describes horizontal gene transfer? a) mitosis followed by cytokinesis b) meiosis and subsequent formation of a zygote c) transfer of genes from mother cell to daughter cell d) DNA replication followed by crossing over e) acquisition of genes from another organism in the same generation |
E. Acquisition of genes from another organism in the same generation |
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The main difference between the two cell types, prokaryote and eukaryote, is the presence of a ________________ in the eukaryote. |
Nucleus |
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Which term describes spherical-shaped bacteria? a) cocci b) bacilli c) spirilla d) vibrios e) pleiomorphs |
a. Cocci |
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Which region contains the chromosome in the bacterial cell? a) Nucleus b) Nucleoid c) Plasmid d) Plastid e) Prophage |
B. Nucleiod |
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(True or False) It is believed that there are few species of bacteria yet to be discovered and described. |
False |
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(True or False) In bacteria, the cytoplasm is similar to that of eukaryotes but there are distinct differences. |
True |
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The __________ Theory is used to explain the origins of mitochondria and chloroplasts in eukaryotic cells. |
Endosymbiotic |
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What are the four macromolecules required for life to exist? |
-Nucleic Acids -Lipids -Polypeptides (proteins) -Polysaccharides |
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What features make SSU (16S or 18S) rRNA gene sequences ideal for phylogenetic studies? |
-Found in all living organisms -Conserved -Changes very slowly over time |
