Some plants are able to endure frequent flooding events because they contain a tissue with loose parenchyma cells and large air spaces called
A. pneumatophores.
B. aerenchyma.
C. xylem.
D. epidermal tissue.
E. spongy mesophyll.
Answer: B
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Refer to the figure. If you examine side A after three days, you should find _____
A) a decrease in the concentration of NaCl and glucose and an increase in the water level B) a decrease in the concentration of NaCl, an increase in water level, and no change in the concentration of glucose C) no net change in the system D) a decrease in the concentration of NaCl and a decrease in the water level E) no change in the concentration of NaCl and glucose and an increase in the water level
If a forest canopy is dense and closed, the understory and shrub layers tend to be well developed
Indicate whether the statement is true or false
Which statement best describes the phenomenon of antibiotic resistance in bacteria?
A) For a particular antibiotic, all bacteria are either completely resistant or completely sensitive. B) When a type of bacteria is resistant to antibiotics, it's resistant to all antibiotics. C) Resistance is a matter of degrees; resistance can be partial or total, and resistance to each antibiotic is a separate trait. D) Resistance to antibiotics is a trait that didn't exist before antibiotics were developed for pharmaceutical use.
If our bodies are capable of secondary responses, how do people contract influenza more than once?
a. Memory cells lose their ability to recognize antigens after six months. b. The affinity of antibodies diminishes in the secondary response. c. New varieties of flu virus continuously evolve. d. Our bodies cannot launch a strong enough immune response against the flu virus. e. There are no effective vaccinations for the flu.