Assuming exposure to the same climate, which of the following aquatic systems would be MOST stratified?
A) 20 m deep freshwater river
B) 50 m deep marine water fjord
C) 200 m deep saltwater lake
D) 300 m deep freshwater lake
Answer: D
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The main limitation of a drug that treats disease by altering chromatin remodeling is that
A) the changes would be passed on to daughter cells. B) it would change the number of copies of a gene that people inherit. C) it would change the expression of many other genes. D) the changes would be epigenetic.
Four of the following are characteristic of morphogens. Which one is the exception?
a. They are long-range signals in pattern formation. b. They are encoded by master genes. c. They affect gene splicing. d. Their concentration decreases with distance from source. e. They affect development.
The gram-negative bacillus associated with abscesses from cat bites or scratches is ________.
A. Bartonella henselae B. Yersinia pestis C. Salmonella typhimurium D. Francisella tularensis E. Brucella suis
Which of the following is not associated with leaf abscission?
a. Chlorophyll breaks down. b. Anthocyanins accumulate. c. A layer of cork develops. d. The middle lamella is strengthened. e. Carotenoids become visible.