Hydrogen bonds in water are due to an attraction between a. a hydrogen on one wa
ID: 89290 • Letter: H
Question
Hydrogen bonds in water are due to an attraction between a. a hydrogen on one water molecule and a hydrogen on a neighboring water molecule b. a hydrogen on one water molecule and an oxygen on a neighboring water molecule c. an oxygen on one water molecule and an oxygen on a neighboring water molecule d. all of the above Electron transfer proteins are found mainly in a. mitochondria and chloroplasts b. nuclei c. cilia and flagella d. all of the above Make this a true statement: undergo photosynthesis, undergo respiration. a. plants;animals b. plants;plants c. plants;plants and animals d. plants and animals;plants and animals e. all of the above What ratio of C: H: O defines a carbohydrate? a. 1: 3: 1 b. 1: 2: 1 c. 2: 1: 2 d. 2: 2: 2Explanation / Answer
41. Hydrogen bonds are the very basic and most widely used bonds among two molecules of almost any kind. This bonding does certainly include hydrogen as one components and the other one defines itself, any other electronegative molecule. As hydrogen is a positively charged molecules, generally found as protons (H+). This type of interaction generally a weak interaction, and mostly these protons are found widely with any other nitrogen, fluorine or oxygen molecule.
The electrostatic field of another highly electronegative atom nearby, this could occur with a hydrogen and an oxygen of another molecule from the option b.
42. Electron transfers proteins are all associated with a cell membrane where they are mostly needed, like the Cytochrome, Cytochrome C, flavodoxin etc. They all are helpful to make the electron molecule to pass on and forms a gradient with the proton molecule too.
In oxidative phosphorylation they work, so the electrons transported across in a defined pathway called electron transport chain, and they are present in inner mitochondrial membranes and also in the chloroplasts. Option a) is correct.
43. Photosynthesis only happens in autotrophic organisms as plants, they have chlorophylls while the animals they are heterotrophs, so they cannot make their own food. On the other hand respiration occurs in plants as well as in animals, because both of them need to respire, and take up oxygen for their own metabolic process.
Option C. Plants undergo photosynthesis, while plants and animals both undergo respiration.
44. C:H:O, carbohydrates means they have got Carbon, Hydrogen and Oxygen to build up any biological macromolecules in their body. This proportion is 1C:2H:1O.
The simplest sugar glucose has got this ratio as well, C6H12O6. Option b. 1:2:1 is the correct answer choice.
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