How are hormones that are made by cell bodies in the hypothalamus delivered to the pituitary gland?
a. via exocrine ducts
b. by the systemic bloodstream
c. by capillaries that supply the anterior pituitary
d. by axons
e. by the lymphatic system
d
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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.
The thermostable enzyme most commonly used in PCR is reverse transcriptase.
Answer the following statement true (T) or false (F)
When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations, they abandon support of the nodules and end the symbiosis. Why?
A. The mineral nutrients inhibit nitrogenase activity. B. Nitrogen gas is no longer available in the soil. C. The plant can conserve valuable energy sources by terminating the symbiotic relationship. D. The dissolved chemical nutrients are toxic to Rhizobium bacteria. E. Dissolved nitrogen uncurls the root hairs, releasing the nodule. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about nitrogen-fixation nodules? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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 streptomycetes form spores on their substrate mycelia.
Answer the following statement true (T) or false (F)