Once researchers identified DNA as the unit of inheritance, they asked how information was transferred from the DNA in the nucleus to the site of protein synthesis in the cytoplasm. What is the mechanism of information transfer in eukarotes?
A) DNA from a single gene is replicated and transferred to the cytoplasm, where it serves as a template for protein synthesis.
B) Messenger RNA is transcribed from a single gene and transfers information from the DNA in the nucleus to the cytoplasm, where protein synthesis takes place.
C) Proteins transfer information from the nucleus to the ribosome, where protein synthesis takes place.
D) Transfer RNA takes information from DNA directly to a ribosome, where protein synthesis takes place.
B
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The surface area of a plant's root system is substantially larger than the surface area of its shoot system. The extensive surface area of roots is an adaptation associated with _____
A) contact with soil particles for mineral and water absorption B) the internal structure of the vascular tissue in roots C) the storage of nutrients within the root system D) the release of carbon dioxide generated by photosynthesis
Where does meiosis occur in a flowering plant? I) megasporocyte II) microsporocyte III) endosperm IV) pollen tube
A) only I B) only II C) only III D) I and III E) I and II
Any organism that can cause disease in the host after direct interaction is a(n)
A. secondary pathogen. B. focal pathogen. C. opportunistic pathogen. D. primary pathogen.
Which of the following is the BEST description of evolution as currently understood by modern biologists?
a) Evolution is goal directed. b) Evolution is influenced by the differential survival and reproduction of phenotypes. c) Evolution includes the results of selection for acquired characteristics. d) Evolution is synonymous with the process of mutation. e) Evolution is synonymous with the process of gene flow.