An instrument that magnifies slight differences in the refractive index cell str
ID: 83595 • Letter: A
Question
An instrument that magnifies slight differences in the refractive index cell structures is called (n) ______ microscope a. electron b. fluorescence c. phase-contrast d. densitometric The term used to describe bacteria that are roughly spherical shaped is _________. A. vibrio b. coccus(cocci) c. bacillus(bacill) d. Spirilla Which of the following processes can be used to bring nutrients into a cell against a concentration gradient? a. Facillitated diffusion b. Active transport c. Passive diffusion d. none of the above Endospores are very resilient to hostile environments since a they have layers of proteins, lipids, other complex compounds to protect them. b, they are smaller with beneficial surface to volume ratios. c. they contain special modifications to macromolecules absent in other life form d. none of the above What property does archaeal and bacterial ribosomes share? a. Both are enclosed in membranes. b. Both have 40s and 60s subunits, c. Both have 30s and 50s subunits. d. Both have DNA in the active sites. NAM (N acetylmuramic acid) in bacterial peptidoglycan units is made up of a. Lipid b. Protein c. Carbohydrates d. Minerals The lipopolysaccharide (LPS) that is found in the outer membrane of gram-negative bacteria is also known as murein exotoxin teichoic acidExplanation / Answer
11.C.An instrument that magnifies slight differences in the cell structures is called as Phase-Contrast microscope.
Phase contrast microscope is a microscope that alters the phase relationships of light passing passing through and that passing around the object,the contrast permitting the visualisation of the object without necessasity of staining or other special preparation.
12. D.The term used to describe the bacteria that are roughly spiral shape is spirilla.
Spirilla are curved shaped bacteria which can range from a gently curved shaped to a corkscrew like spiral,Spirilla are rigid and capable of movement.A specail group of spirilla known as spirochetes are long slender and flexible.
13.B.The processess that can be used to bring the nutrients into cell against concentration gradient is called as Active transport.
Active transport uses cellular energy to move them against a gradient, polar repulsion, or other resistance. Active transport is usually associated with accumulating high concentrations of molecules that the cell needs, such amino acid, glucose and ions. If the process uses chemical energy, such as from adenosine triphosphate (ATP), it is termed primary active transport. Secondary active transport involves the use of an electrochemical gradient. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.
14.A. Endospores are very resilient to hostile environment since they have layer of protiens lipds and other complex compounds to protect them.
Bacteria are a large group of microscopic, unicellular organisms that exist either independently or as parasites. Some bacteria are capable of forming spores around themselves, which allow the organism to survive in hostile environmental conditions. Bacterial spores are made of a tough outer layer of keratin that is resistant to chemicals, staining and heat. The spore allows the bacterium to remain dormant for years, protecting it from various traumas, including temperature differences, absence of air, water and nutrients.
16.B.NAM in bacterial peptidoglycan is made up of Protien.
17. The lipopolysaccharide found in the outer membrane of gram negative bacteria is known as endotoxin.
Lipopolysaccharides (LPS), also known as lipoglycans and endotoxins, are large molecules consisting of a polysaccharide and lipids composed of O-antigen, outer core and inner core joined by a covalent bond.They are found in the outer membrane of gram negative bacteria and they elicit strong immune responses in animals.
So none of the above mentioned option is correct.
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