Chloroplasts arose by endosymbiosis of a(an)?
A. aerobic archaeon.
B. aerobic bacterium.
C. anaerobic bacterium.
D. photosynthetic bacterium.
F. photosynthetic archaeon.
Answer: D. photosynthetic bacterium.
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The region of the heart called the SA node is significant because ________
a. defects in the structure result in the irregular sounds called heart murmurs b. it sets the rhythm for heart rate c. most heart attacks begin there d. none of the choices
Most codons specify a(n) _____
a. protein b. polypeptide c. amino acid d. mRNA
The greatest limitation faced by terrestrial organisms is desiccation
Indicate whether the statement is true or false
Dr. Ling, the famous brain surgeon, removes a portion of the skull during surgery. Which of the meninges does she see first?
A) ventricle B) pia mater C) dura mater D) arachnoid