The structure of the sliding clamp is ____ in bacteria, archaea and eukaryotes, which likely indicates that ____
a. largely variable; the function of the sliding clamp is different in these organisms
b. largely variable; the function of the sliding clamp is similar in bacteria and archaea but different in eukaryotes
c. highly conserved; the sliding clamp is involved in different processes depending on the organism
d. highly conserved; the function of the sliding clamp is similar in these organisms
e. largely variable; the sliding clamp is not essential for DNA replication
ANSWER: d
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Cellular slime molds can be distinguished from plasmodial slime molds on the basis of
a. reproductive structures. b. spore formation. c. nuclei per cell. d. slime trails. e. food requirements.
Which of the following prokaryotic nutritional
groups use organic substances for both carbon and energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. none of these
Which of the following forms of genetic information has direct contact with amino acids and therefore, directly impacts the specific type of protein product being produced? Select the best choice.
A. DNA, mRNA, and tRNA B. DNA and mRNA C. DNA and tRNA D. rRNA E. tRNA
Morphogenesis is characterized by
A. cells becoming specialized in structure and function. B. cell division and growth in size. C. body parts being shaped and patterned into a specific form. D. All of the choices are correct. E. None of the choices are correct.