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Aerotolerant anaerobes are incapable of aerobic respiration, but can nevertheless grow in the presence of air. Many lactic acid bacteria fall into this category. They can only generate energy by fermentation and lack both catalase and superoxide dismutase, but are able to grow in the presence of oxygen because they have a mechanism for destroying superoxide. Microorganisms affect the Eh of their environment during growth. This is true especially of aerobes, which can lower the Eh of their environment while anaerobes cannot. As aerobes grow, oxygen in the medium is depleted, resulting in the lowering of Eh. Growth is not slowed, however, due to the ability of cells to make use of oxygen donating or hydrogen-accepting substances in the medium. The result of this is that the medium becomes poorer in oxidizing and richer in reducing substances. Microorganisms canreduce the Eh of a medium by their production of certain metabolic by-products such as hydrogen sulphide, which has the capacity to lower Eh to -300 mv.
Menstrual Cycle- Reproduction Menstrual cycles are characteristic of primates and do not occur in other vertebrate groups. The length of the cycle is highly variable, though 2
Q. Basis of Classification on Form-relationship principle? As pointed out earlier, this system is mainly based on Form-relationship principle. thus the various genera were. g
a) What process is responsible for the movement of carbon dioxide into a leaf? b) In what conditions might the same process cause oxygen to enter a leaf? (a) Diffusi
Spiracular Control - Respiration Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Why is the Krebs cycle also called the final common pathway of the degradation of organic compounds? The Krebs cycle is known as the final common pathway of the degradation of
The citric acid cycle also called as the TCA cycle (tricarboxylic acid cycle) and the Krebs cycle or the Szent-Györgyi-Krebs cycle is a series of chemical reactions used by all aer
Define effect on Human placental lactogen in pregnancy? Human placental lactogen, with a structure similar to the growth hormone, increases throughout pregnancy. Its rate of pr
Is the interphase of meiosis different from the interphase of mitosis? The interphase that precedes meiosis is same to the interphase that precedes mitosis. In them the major e
Composed of C, H and O (fewer polar OH bonds than carbohydrates) Can be used at energy storage, components of cell membranes, chemical signals & thermal insulation Are
A fish of genotype a/a; B/b is crossed to a fish whose genotype is A/a; B/b. What proportion of the progeny will be heterozygous for at least one of the genes? (Assume independent
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