An atom with an electrical charge is a(n) ________
A) isotope
B) molecule
C) ion
D) compound
C
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Which of the following statements is true of bacterial polysomes?
A. Translation can initiate with an mRNA before transcription of that mRNA is complete. B. A single ribosome can translate multiple mRNA molecules at the same time. C. Polysome formation ensures that only one polypeptide is translated per mRNA molecule. D. Polysomes are membrane-bound compartments where translation occurs.
Members of the ____ ("jointed feet") Ecdysozoan phylum have a segmented body encased in a rigid exoskeleton made
of chitin plus other materials.
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
What key factor limits the number of trophic levels in an ecosystem?
a. maximum solar radiation b. energy loss c. herbivore size d. predator size e. climate
The size of the motor area in the brain for any specific body part is relative to:
a. the rest of the body.
b. its position in the body. c. the complexity of its movements. d. the number of muscles it contains. e. the area of the brain that controls it.