Which of the following is a correct matching of the researcher with their discovery?
A. Pauling provided information on primary structure in biological molecules.
B. Franklin suggested that DNA was a helix with more than one strand and that there were about 10 bases per turn of the DNA
C. Watson and Crick collected a large amount of X-ray data on the structure of DNA.
D. Chargaff demonstrated that the adenine and cytosine bases and the uracil and guanine bases interacted in some manner.
B
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Based on the tree shown above, the presence of complex, multicellular fruiting bodies in Basidiomycete and Ascomycete lineages is an example of:
A. convergent evolution. B. a homologous trait. C. a synapomorphy uniting basidiomycetes and ascomycetes as sister taxa. D. a parsimonious trait. E. an ancestral character state.
Which of the following pathways for complement activation is generally dependent upon the formation of antigen-antibody complexes?
A. Classical pathway B. Lectin complement pathway C. Alternative pathway D. All of the choices are correct.
An adaptive trait is a trait that has
a. mutated. b. survival value. c. decreased in frequency in a population. d. deleterious biological effects. e. the potential to produce variation.
A group of geneticists exposed the seeds of a dicot plant to various levels of radiation in order to induce random mutations. Many of the irradiated seeds failed to germinate
Some of the seeds, however, germinated in the lab and were carefully studied. The scientists discovered a mutation that prevents the formation of a hypocotyl hook during germination. Based on this scenario, the mutant plant most likely germinated A) but was unable to photosynthesize. B) but damage to the cotyledons prevented the seedlings' emergence from the soil. C) but the mutated hypocotyl hook caused damage to the emerging root tip. D) and grew like a normal plant. E) but the mutated hypocotyl hook failed to push the cotyledons above the soil.