According to the biological species concept, two groups of organisms that are unable to form fertile, viable hybrids are considered to be different
A. races.
B. species.
C. kingdoms.
D. hybrids.
E. cohabitants.
B. species.
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Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
Parallel ? sheets differ from antiparallel ? sheets because:
A. neighboring amino acids are on one rather than both sides of the sheet. B. large aromatic groups are only allowed with parallel sheets. C. parallel sheets can form between a single polypeptide. D. the N-to-C orientation of all the ? strands are aligned. E. hydrogen bonds are crucial for stability.
Which of the following characteristics is present in all chordates?
A. gills B. notochord C. vertebrae D. All of the above are correct.
Collection of microtubules that assist in the orderly distribution of chromosomes during cell division.
What will be an ideal response?