Cylindrical layers of meristem that run lengthwise through shoots and roots, and allow for thickening, are called ____.
A. lateral meristems
B. apical meristems
C. ground meristem
D. procambium
E. protoderm
Answer: A
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An enzyme that cleaves internal phosphodiester bonds of a DNA molecule is a (n)
A. ligase. B. exonuclease. C. methylase. D. endonuclease.
What percent of the known animals on Earth are invertebrates?
a. 15% b. 56% c. 89% d. 33% e. 97%
Answer the following statements true (T) or false (F)
1.Lichens and mosses that can grow on and erode rock would be considered pioneer species. 2.All communities eventually reach the climax state, in which all components are consistent. 3.Energy is constantly being recycled within an ecosystem. 4.Raw sewage within a water ecosystem can kill fish because respiration by the microbes in the sewage reduces the concentration of oxygen within the water. 5.In a process called denitrification, bacteria convert NO – to N .
The function of the epiglottis is to
A) keep the bronchi from collapsing. B) produce surfactant. C) assist the vocal cords in sound production. D) facilitate gas exchange in the lungs. E) prevent food from entering the larynx.