How does cellular specialization serve multicellular organisms and how might a high degree of specialization be detrimental?
What will be an ideal response?
In a multicellular organism, the specialization of cells creates a division of labor and each type of cell relies on the activities of other cell types for survival. This cooperation between specialized cells is essential for the organism as a whole. If one of these overly specialized cells were removed from the context of the organism, it would not have the capabilities needed to generate offspring and would probably not even live very long.
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Your sister-in-law never gets sick, while her male neighbor seems to be sick all the time. Although there are several explanations for this, one is that they are genetically different
Which of the following hypotheses concerning genetic inheritance of major histocompatibility complex (MHC) molecules is consistent with this observation and your understanding of the immune system? A) MHC inheritance works like normal Mendelian genetics in the sense that there are dominant traits and recessive traits, and in the case of MHC, those with the dominant trait produce more normal MHC proteins and are healthier than those (that are homozygous recessive). B) In the case of MHC, it is beneficial to have as many different alleles as possible, so heterozygous individuals are healthier than homozygous dominant or recessive individuals. C) MHC proteins are often closely associated with small antigen particles that have been broken off the main pathogen, so that individuals who are recessive for MHC don't normally have many illnesses because they don't produce these MHC-antigen complexes. D) MHC inheritance is X-linked, and thus, males will have a higher percentage of weak immune systems than females do.
A friend of yours picks up a branch like the one pictured at the right. Knowing that you have taken a biology course and studied plants, she asks you what the plant is. Identify this branch, giving your friend the full scientific name for the plant.
What will be an ideal response?
What is a consequence of the fact that the chickenpox virus has a much lower mutation rate than the influenza virus?
A. Chickenpox virus can "hide out" as latent virus in nerve cell bodies, but influenza cannot. B. Chickenpox creates skin lesions, while influenza leads to body aches. C. Chickenpox virus can reemerge decades later with the symptoms of shingles, while influenza is transient. D. A chickenpox infection generally gives immunity against a repeat infection, but people can catch the flu every year. 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 viral mutation rates? 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?
The sources of the ozone-destroying contaminants in the upper atmosphere were found to be ________.
What will be an ideal response?