Which of the following defines an ecosystem?
A. all the places on Earth where living organisms can be found
B. aspects of the nonliving environment interacting together
C. all of the living organisms in an area interacting together
D. all living organisms and the nonliving environment interacting together
E. a group of organisms of the same species interacting together
Answer: D
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The direct visualization of a developing fetus to diagnose disorders is called
a. chorionic villus sampling. b. preimplantation diagnosis. c. amniocentesis. d. fetoscopy. e. senescence.
A scientist wants to study histones. Histones are
A. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase. B. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes. C. proteins that required for the activity of Cdk enzymes. D. proteins that regulate checkpoints in the mitotic cell cycle. E. proteins that double-stranded DNA molecules wrap around in eukaryotes.
Which stage of translation is shown in the
figure above? a. initiation b. elongation c. termination d. peptide bond formation e. polysome activity
What is the purpose of the respiratory pigments that are specialized proteins in blood?
A) They contain metal ions. B) They occur only in insects. C) They increase the efficiency of carbon dioxide transport. D) They turn the blood blue when oxygen is bound.