Which of the following organisms are prokaryotes bacteria an

Which of the following organisms are prokaryotes? bacteria and fungi archaea and fungi protozoa and animals bacteria and archaea viruses and prions Which of the following defines a heterotroph? An organism that must obtain its carbon in an organic form An organism that does not require essential nutrients for growth An organism that uses CO^-2 _3 as its carbon source An organism that produces all the trace elements it requires for growth An organism that uses as its carbon source Which complex is responsible for producing protein? What is this process called? ribosome; transcription DNA polymerase; translation RNA polymerase, DNA replication RNA polymerase: transcription ribosome; translation What is the main component of a bilayer membrane? complex polysaccharides DNA RNA phospholipids amino acids When higher magnification (1000X) is needed to analyze a slide with a biological sample, we must use immersion oil. Why? to reduce the scattering of light when it goes through the sample to avoid contamination of the observer with bacteria on the slide the statement is wrong: oil is not needed at 1000X magnification to protect the observer\'s eyes Gram staining is the most common technique in Microbiology. The use of Gram\'s iodine is essential for a successful Gram stain. Why? It will disinfect the bacteria on the slide. It makes mycobacteria susceptible to Gram stain. It is used as a mordant, \"locking\" the crystal violet inside Gram-negative bacteria. It is used as a mordant, \"locking\" the crystal violet inside Gram-positive bacteria. It is used as a counterstain.

Solution

1. The correct option is d that is bacteria and archaea. They both are a unicellular organism which lacks a cell bound nucleus and thus termed as prokaryotes.

2. The correct option is a that is a heterotroph is an organism that must obtain its carbon in an organic form. Since heterotroph is an organism that is unable to synthesize their food. Due to which they require having the carbon in organic form which is obtained by the food produced by the autotroph that is by plants.

3. The correct option is e that is the ribosome is responsible for the binding on the mRNA transcript for the formation of the protein molecule and the process of formation of a protein is called translation.

4. The correct option is d that is phospholipids are the main of bilayer membrane. This is because the bilayer membranes are made up of phospholipids that maintain the fluidity of membrane and its mosaic nature.

5. The correct option is a that is to reduce the scattering of light when it goes through the sample. This is because the light microscope uses glass and air as a medium to visualize the samples. so while moving from one medium to another, light tends to bend making the image less clearly visible. Immersion oil has the same refractive index as that of glass. So it\'s usage restricts the bending of light and a magnification of 1000X is achieved making the sample more visible.

6. The correct option is d. It acts as a mordant and locks the crystal violet stain inside the thick peptidoglycan cell wall of gram-positive bacteria. This helps in differentiating gram positive bacteria from gram-negative bacteria. The gram-negative bacteria does not hold the crystal violet stain inside its wall after iodine wash. The iodine solution dehydrates, shrinks and causes the stain to get trapped in the thick wall of the peptidoglycan layer of gram-positive bacteria.