Which of the following best describes which chordate characteristics lancelets retain as adults?
A) Pharyngeal gill slits, limbs, and lobed fins
B) Dorsal nerve cord, jaws, limbs, and lobed fins
C) Post-anal tail, hair, jaws, and amniotic egg
D) Notochord, lobed fins, and jaws
E) Notochord, dorsal nerve cord, post-anal tail, and pharyngeal gill slits
E
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In an isotonic contraction of a skeletal muscle,
(a) the tension in the muscle increases. (b) movement occurs. (c) no movement occurs. (d) both a and c occur.
Excess nutrients in the aquatic environment can cause an initial population surge of primary producers, but eventually results in a collapse of the ecosystem. Which of the following answer choices is not a direct reflection of this statement?
A. Habitats have a particular carrying capacity. B. All trophic levels can be interdependent. C. Communities are shaped by the physical environment. D. Animals interact with their physical environment.
In an extant prokaryotic cell the outer boundary of life is the capsule.
a. true b. false
All of the following are Coliforms that cause Opportunistic and Nosocomial Infections, except:
a. Klebsiella b. Citrobacter. c. Shigella d. Serratia e. Enterobacter