Which of the following is a fomite?a. a prairie dog infested with fleas infected with the plaue bacterium b. a river contaminated with the Giardia protozoan c. a doorknob contaminated with the cold virus d. an asymptomatic person infected with HIV e. a mosquito infected with the malaria protozoan
The correct option is: c. a doorknob contaminated with the cold virus
Fomites are the inanimate objects or substances that can get contaminated with the pathogens and are capable of transferring the pathogens to the new hosts.
Sterilization of the possible fomites should be done in order to prevent cross-infection.
Examples of fomites are hair, towels, clothes, door knobs, cups, switches, handrails, remote controls, pens, syringes, bedding, etc.
Both molecules and compounds are made up of 1.molecules 2.compounds 3.atomsTwo or more atoms joined together by shared electrons form 1. A compound 2.an element 3.a molecule Substances made from two or more different elements are 1.molecules 2.atoms 3.compounds
Certain seed-eating birds are able to crack seeds according to the size of their beaks. Long beaks are able to crack larger seeds, whereas shorter beaks are able to crack smaller seeds. A graph of a bird population with different-sized beaks is shown below.After a several-year drought, smaller seeds became scarce, but drought-resistant trees continued producing larger seeds. What graph would best predict the change in beak length of the bird population?
The graph that would best predicts the change in the break length of the bird population is that of the third graph.
How are the beaks of the seed-eating birds developed?
The seed-eating birds includes the Sparrows and finches, and redpolls. Grouse has different sizes of beaks as per the body ratio. Evolution and natural selection play a crucial role in the development of the beaks. The shape of the break determines the type and shape of seed it will eat.
As per the graph given the length of beaks will increase as the number of individual birds increases. Thus the diversity of breaks depends on the diversity of the species. Hence the option C is correct.
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Which of the following statements can be attributed to water's versatility as a solvent
The polar nature of water make water universal solvent.
The polar nature of water is responsible for the versatility as a solvent because due to this polar nature of water maximum number of solutes or chemicals dissolved in it and it is also called universal solvent. Polar nature means making positive and negative polar which attracts the opposite charge atoms and making covalent bond with them. The hydrogen has partial positive charge so it attracts negative charge atom while oxygen has partial negative charge so it attracts positive charge atom.
Water's versatility as a solvent can be attributed to its polarity, hydrogen bonding, and high dielectric constant.
Water's versatility as a solvent can be attributed to several factors:
Water is a polar molecule, meaning it has a slightly positive end and a slightly negative end. This allows water to dissolve many different substances that have charged or polar molecules, like salts and sugars.
Water can form hydrogen bonds with other molecules. This allows it to dissolve substances that can form hydrogen bonds with water, such as alcohols and organic acids.
High Dielectric Constant:
The dielectric constant of water is relatively high, which means it can weaken intermolecular forces between solute particles and allow them to dissolve more easily.
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Within a narrow range of temperatures, S. marcescens produces a red pigment called prodigiosin. Although the ultimate purpose of the pigment is a mystery, it is known that at least 10 enzymes are required for its production. If one of these enzymes is rendered nonfunctional, how would you expect the appearance of the bacteria to change?
Either the color will disappear or the brightness of the color will reduce as compared to the brightness in normal case.
Non diffusible red pigment known as prodigiosin is a characteristics of S. Marcescens. Since, the red pigment is dependent on least 10 enzymes, it is clear that the pH and temperature range must be adequate for these enzymes to be functional. The optimum condition for pigment formation is 30 degree temperature and alkaline medium.
If any of the 10 enzymes become non-functional, the chances of attaining normal bright red color are not possible. Either the color will disappear or the brightness of the color will reduce as compared to the brightness in normal case.
Simply, translation is a copy of _______________a. DNA from mRNA b. DNA from DNA c. protein from RNA d. RNA from DNA
c. protein from RNA
Translation is a process that occurs in the ribosomes where tRNA is used to read the mRNA strand and translate the codons into complementary amino acids.
In what direction air in the southern hemisphere deflects due to coriolis effect?a.)left b.)right C)left and right d.)neither left or right
Answer : a.) left
Air is deflected to the left in the southern hemisphere.
Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect. Answer: left