What are three important differences between mitosis and meiosis I?
What will be an ideal response?
In meiosis I, but not in mitosis, the following three processes occur:
1. Homologous chromosome pairing
2. Crossing over between homologous chromosomes
3. Segregation (separation) of the homologous chromosomes, which reduces chromosomes to the haploid number
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Morphological traits are commonly used to identify species, which of the following can also be used?
A. The ability to interbreed. B. Molecular similarity (DNA and chromosome comparisons). C. Ecological factors. D. Evolutionary relationships. E. All of these.
Listeria monocytogenes propels itself through mammalian host cells using
A. a modified form of gliding motility. B. fimbriae-based twitching motility. C. periplasmic flagella. D. host cell actin and other cytoskeletal proteins.
Based on the cladogram, birds are most closely related to
A. snakes.
B. dinosaurs.
C. crocodiles.
D. mammals.
E. amphibians.
Please select the pathogen from the genus Streptococcus that correctly represents the most serious pathogen of this group.
A) Group A beta-hemolytic S. pneumoniae B) Group A beta-hemolytic S. pyogenes C) Group A beta-hemolytic S. agalactiae D) Group B alpha-hemolytic S. pyogenes