Comparison of gene sequences among species has revealed:
A) the greater the similarities in gene sequences, the more recently two species shared a common ancestor.
B) the greater the differences in gene sequences, the more recently two species shared a common ancestor.
C) humans and snakes are more closely related than humans and pigs.
D) humans and yeast shared a recent common ancestor.
Answer: A
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Amphistegina gibbosa is a species of protist with filose pseudopodia found near coral reefs. What cannot be true of A. gibbosa?
A. They are enclosed within a shell composed of calcium carbonate. B. They have sacs under the cell membrane. C. They can be useful in studying global warming. D. They are heterotrophic. E. They are closely related to radiolarians.
Why do researchers often include DNase in their antibiotic preparations to eliminate biofilms?
A. The antibiotics cannot readily penetrate the extracellular debris, which often includes DNA from lysed cells. B. Targeting the bacterial chromosome is the most effective way to kill biofilm bacteria. C. If the microbe's genome can be destroyed, the cell will die. D. The antibiotics target the cell wall and the DNase targets the genome, effectively destroying the biofilm.
A biofilm is an example of (antagonism/competition/cooperation) among microbes.
Fill in the blank(s) with the appropriate word(s).
The renal pyramids are located within the renal pelvis.
Answer the following statement true (T) or false (F)