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Q. 1. Heart muscle cells have auto rhythmicity meaning that the cells depolarized on their own. What is it about the ion channels in the cells that cause this to happen?
2. What is the function of the pacemaker nodes (SA and AV) and bundle branches in maintaining heart rhythm? Where are each of these structures located. Which one initiates the wave of depolarization across the atria? How does the depolarization wave get from the atria to the ventricles? Be able to explain the series that the each of the above structures is activated during the depolarization wave (such as which is 1st, 2nd, 3rd etc.). What parts of the heart contract as the wave passes them and in what order?
3. What parts of the autonomic nervous system control heart rate and what effect does each have on it?
According to our current knowledge of plant evolution, which group of organisms should feature mitosis most similar to that of land plants.
Albinism is a condition that results from the lack of normal pigmentation. In humans, individuals with two recessive alleles at ALBINO (aa) locus are albino.
Explain the general pattern of alternation of generation in plants. Explore why the gametophyte has been reduced to a part (or parasite) of the sporophyte as plants have evolved. Present and defend your finding. Please list sources used. Write in Tim..
Diploid nuclei of the ascomycete, Neurospora crassa, contain 14 chromosomes. A single diploid cell in an ascus will undergo one round of meiosis, followed in each of daughter cells by one round of mitosis, producing a total of eight ascospores.
While you measure the genotype frequencies of the population you get the following data. What will the frequency of Aa be in the next generation.
Using the knowledge of DNA replication, describe the mechanisms in place for preventing mistakes during the process. Also discuss how potential mistakes can happen? What would be the consequences of such mistakes during the process.
If the horticulturist breeding gardenias succeeds in having a single plant with a particularly advantageous set of traits, which would be her most probable and efficient route to establishing a line of such plants.
A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 35 ears in 1/1000 of an acre. He determines that each ear has about 500 kernels on average. He also knows that a bushel contains about 97,..
Eastern tent caterpillars live in sizable groups in silk nests, or tents, which they construct in cherry trees. They are among the first insects to become active in the spring, emerging very early in the season-a time while daily temperature fluctuat..
What is the phenotypic ratio for the F2 generation? Demonstrate the work, including your key. what are Harry and Sally's blood types? Show your work. What if blood typing exposed Harry had type O blood.
Why may selfing be selected for in nature yet still be an ‘evolutionary dead end'. How many kilocalories must Janine eat each day to maintain her present body weight.
The research team used the setup to study the incorporation of labelled nucleotides into culture lymphocytes and found that the lymphocytes incorporated the labelled nucleotide at significantly higher level after a pathogen was introduced into the cu..
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