Haemophilus influenzae requires hemin (X factor) to synthesize cytochromes and NAD+ (V factor) from other cells
For what does it use these two growth factors? What diseases does H. influenzae cause?
Cytochromes are proteins with an iron-containing group, related to the heme group, which are capable of existing alternately as a reduced form of Fe++ and and oxidized form of Fe+++. These cytochromes are involved in electron transport chains. It needs NaD+ to acquire an electron. Haemophilus influenza is caused by a Gram-negative bacterium. These pathogenic organisms invade the mucous membranes of the upper respiratory tract, mouth, vagina, and the intestinal tract. The disease relies on X factor, which is a blood hemoglobin, to synthesize the important areas of the cytochromes.
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Homeotic genes encode very important transcription factors that specify the identity of body parts or segments during development
For example, the development of legs on thoracic segments T1, T2, and T3 and wings on segment T2 is controlled by homeotic genes. A. true B. false
__________ refers to multiple independent pairs of genes having similar and additive effects on the
same characteristic. a. Codominance b. Epistasis c. Polygenic inheritance d. Complete dominance e. Additive dominance
Which is true concerning cell division?
A. During meiosis I, sister chromatids pair up and then are separated B. An asexually reproducing organism needs mitosis to produce a genetically diverse set of daughter cells in order to maintain genetic diversity C. When comparing the parent and daughter cells, meiosis differs in both the ploidy level and ploidy number, whereas mitosis differs in neither D. During crossing over, an allele for brown eyes may be switched with an allele for brown hair
Which of the following statements describes the mitochondrial intermembrane space?
(a) It is permeable to molecules with molecular mass as high as 5000 daltons. (b) It contains transporters for ATP molecules. (c) It contains proteins that are released during apoptosis. (d) It contains enzymes required for the oxidation of fatty acids.