Some cyanobacteria form ________, which are comprised of chains of bacterial cells that are in close contact with one another over a large area.
A. cell mats
B. mycelia
C. trichomes
D. hypha
Answer: C
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Esherichia coli and Clostridium acetylbutylicum are reported to be derived from a common ancestor. They both have similar but not identical gene sequences. Which of the following could best explain this difference in genetic coding?
A. They have a common ancestor, their DNA has been inherited from the common ancestor, therefore it will be similar. B. The two species never diverged but they were discovered by two different scientists and therefore given different names. C. These orthologs show identical gene segments, but the entire sequence has differences, therefore they are related through ancestoral genes. D. Gene duplication created paralogs. E. After the two species diverged, the genes accumulated random mutations that resulted in similar but not identical gene sequences.
Small quantities of hormone can result in profound responses in target tissues. This type of response is referred to as
a. amplification b. a first messenger response c. a gene activation response d. a neural response e. a growth factor response
Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.
Answer the following statement true (T) or false (F)
What is proprioception?
A) the sense of pressure on the body B) the sense of the position of the body C) the sense of smell D) the sense of the body's temperature