The immunoglobulin superfamily includes a wide variety of soluble and cell-bound proteins important in the immune response. These proteins can be best described as sharing:
A. a nearly identical primary structure.
B. a nearly identical primary structure, and similar structural motifs and function.
C. limited to close sequence similarity, and similar structural motifs and function.
D. none to limited sequence similarity, and similar structural motifs and function.
E. limited to close DNA-coding sequences, and similar structural motifs and function.
D
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Hepaticophytes lack stomata and tracheids. What would provide evidence to justify their inclusion in the Bryophytes and not the Charophytes?
A. Cellulose in their cell walls B. Genes for ABA signalling C. The use of chlorophyll D. A haplodiplontic lifecycle Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about hepaticophytes? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Abrupt genetic changes that quickly lead to the reproductive isolation of a group of individuals is
likely to lead to
a. sympatric speciation. b. allopatric speciation. c. extinction. d. mutation. e. anagenesis.
A gene that produces multiple effects is called
a. a multiple allele. b. an autosome. c. an epistatic gene. d. a pleiotropic gene. e. an incompletely dominant gene.
Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactive isotopes were never detected in any samples containing just soil taken during the experiment. The finding implies that the
a. soil does not provide the ecosystem with minerals b. isotopes were undetectable in very small amounts c. isotopes were transported via vascular tissues d. plants quickly return minerals to the soil in which they grow e. soil speeds up radioactive decay