Porpoises and some bats find their prey using sound waves in the _________range.
A. supersonic
B. infrasonic
C. ultrasonic
D. high-pitched, human ear-audible
E. low-pitched, human ear-audible
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.
The breathing center is located in the ________ of the brain and is responsible for the basic breathing rhythm
Fill in the blank(s) with correct word
Double-stranded viral DNA is incorporated into a host cell as a _____.
Fill in the blank(s) with the appropriate word(s).
All of the following are animal mechanisms to cope with the problem of water balance EXCEPT
A. secretion of regulatory hormones into the tubule. B. coupling of water/salt removal with metabolic waste removal. C. kidneys used as filtering organs. D. contractile vacuoles. E. passage of water and waste of the body across a layer of cells into a tubular structure.