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Which is not found in a gram negative bacterial cell?
In a Gram-negative bacterial cell, peptidoglycan is present but in a much thinner layer compared to Gram-positive bacteria. However, unlike Gram-positive bacteria, Gram-negative cells do not have a teichoic acid layer. Additionally, they possess an outer membrane containing lipopolysaccharides (LPS), which is absent in Gram-positive bacteria. Therefore, teichoic acids are not found in Gram-negative bacterial cells.
Essential amino acid Can be synthesized if?
Yes, essential amino acids can be synthesized.
What color develops when ninhydrin react with amino acids?
These are the amino acids that will yield positive result to the ninhydrin test: Non-polar amino acids: Glycine, Alanine, Valine, Leucine, Isoleucine, Phenylalanine, Methionine, Tryptophan Polar Neutral Amino acids: Serine, Cysteine, Threonine, Asparagine, Glutamine, Tyrosine Polar Acidic Amino Acids: Aspartic acid and Glutamic acid Polar Basic Amino Acids: Histidine, Lysine, Arginine
What samples did not give a positive test with xanthoproteic test why?
The xanthoproteic test is used to detect the presence of aromatic amino acids, particularly tyrosine and tryptophan, by turning yellow upon reaction with nitric acid. Samples that do not contain these amino acids, such as certain non-aromatic amino acids (e.g., glycine, alanine) or peptides and proteins lacking these residues, will not yield a positive test. Additionally, any substances that do not contain proteins or peptides, such as carbohydrates or lipids, will also not give a positive result. Thus, the absence of aromatic amino acids or proteins in the sample is the reason for a negative xanthoproteic test.
Is dental caries gram positive or negative?
Dental caries is primarily associated with gram-positive bacteria. The most common bacteria involved in the development of dental caries include Streptococcus mutans and Streptococcus sobrinus, both of which are gram-positive. These bacteria metabolize sugars to produce acids that demineralize tooth enamel, leading to cavities. While there are also gram-negative bacteria present in the oral microbiome, the key players in caries formation are predominantly gram-positive.
What are positive and negative effects of acid rain?
If acid rain has got negative affects, it also has some positive ones. 1) It helps 2 slow down global warming. 2) It can lessen the affects of pollution. 3) It reduces green house gases. Negative: 1) Destroys crops 2) People sick. 3) Animals die. 4) Surroundings get dangerous and harmful BB Thanx
What charge do acids have?
Acids are compounds that typically have a negative charge, as they release hydrogen ions (H+) when dissolved in water. This release of hydrogen ions is what gives acids their characteristic sour taste and ability to conduct electricity.
A substance that completely dissociates into its ions in solution?
A strong electrolyte is a substance that dissociates completely into positive and negative ions in its solution. Examples of strong electrolytes that are acids are hydrochloric and nitric acids.
What are the good and bad effects of acids and alkalis on the people and the environment?
strong acids are corrosive which can burn our skin. strong alkalis are dangerous as if they go in our mouth our mouth will swell up .
Do acids have positive charges or negative charges?
All acids have positive charge. Both mineral and carboxylic acids ionise to some degree in solution producig hydrogen ions H^(+). , Notice they are plus/positive. It is these ions that are the avid component on a substance. E.g. Mineral acid H2SO4 = 2H^(+) + SO4^(2-) e.g. Carboxylic acid CH3COOH = CH3COO^(-) + H^(+) The pH scale indicates the number of H^(+) ions in a solution. The lower the number , the more H^(+) ions.
What are negative health effects from nitrogen oxide?
Nitric oxide (NO) is very toxic by inhalation.
Is staphylococcus aureus negative for the methyl red test?
Yes, Staphylococcus aureus is negative for the methyl red test due to its inability to produce stable acids from glucose fermentation. This distinguishes it from other enteric bacteria that are positive for the methyl red test.
How can pH be negative in a solution?
pH can be negative in a solution when the concentration of hydrogen ions is extremely high, leading to a more acidic environment. This is rare and typically only occurs in very strong acids.
Which is not found in a gram negative bacterial cell?
In a Gram-negative bacterial cell, peptidoglycan is present but in a much thinner layer compared to Gram-positive bacteria. However, unlike Gram-positive bacteria, Gram-negative cells do not have a teichoic acid layer. Additionally, they possess an outer membrane containing lipopolysaccharides (LPS), which is absent in Gram-positive bacteria. Therefore, teichoic acids are not found in Gram-negative bacterial cells.
Does soda have acid in it?
Yes, soda contains acids like citric acid and phosphoric acid which give it a tangy taste. These acids can contribute to the erosion of tooth enamel and may have negative effects on health if consumed in excess.
All amino acid having an aromatic ring give a positive xanthoproteic test under identical condition?
No, not all amino acids with an aromatic ring give a positive xanthoproteic test. The xanthoproteic test is mainly positive for amino acids containing aromatic rings with phenolic groups such as tyrosine and phenylalanine. Aromatic amino acids like tryptophan do not give a positive xanthoproteic test under identical conditions.
How do you use zwitterion in a sentence?
A zwitterion is a ion that has both a positive and a negative charge. To use it in a sentence, you might say that "a zwitterion is basically a hybrid ion that you may learn about when you study physics."
