Considering its relationship with the other systems of the body, what is the importance of the circulatory system?
What will be an ideal response?
From an evolutionary viewpoint, this adaptation was necessary for the evolution of large organisms with specialized ells, tissues, and organs. The quick and efficient transport of substances from one place to another via the circulatory system means cells located far apart are actually in close functional contact.
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Diazotrophs maximize nitrogenase activity by
A) closely coupling N2 fixation with high rates of photosynthesis. B) fixing N2 at times when oxygen is absent or in low concentrations. C) producing specialized structures to protect nitrogenase from oxygen. D) producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen.
Coloration in the peppered moth (Biston betularia) is determined by a single gene with two alleles showing complete dominance. Dark moths are homozygous dominant or heterozygous for the gene, light moths are homozygous recessive. In a sample of 100 moths, you determine that 64 of the moths are dark. According to the Hardy-Weinberg rule, the expected frequency of the dominant allele is ___.
A. 0.4 B. 0.36 C. 0.6 D. 0.64 E. cannot be determined 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 the Hardy-Weinberg principle? 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?
Given what is known about the minimal essential functions of cellular life, if you could create an artificial cell, what cellular structures must you include?
A. nucleus B. mitochondria C. cell wall D. ribosomes
What feature distinguishes all hormones from neurotransmitters?
A. Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell. B. Hormones require large concentrations to have an effect, while neurotransmitters require only low concentrations. C. Hormones are steroids, while neurotransmitters are amino acids. D. A hormone affects reproductive functions, while neurotransmitters control all other processes.