If the dominant allele is t and the recessive allele ("non-taster") is n, than tn and tt are the genotypes of a "taster". tn is heterozygous and tt is dominant homozygous. nn is the genotype of a "non-taster" and it is recessive homozygous.
The answer to the question above is the fourth option which is <span>RNA.
RNA </span>stands for Ribonucleic acid. It is a nucleic acid. RNA is a polymeric molecule which has several biological roles including <span> coding, decoding, regulation, and expression of genes.</span><span>
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Answer:
A. Shigella are H2S + and motile, Salmonella are H2S - and nonmotile
Explanation:
<em>Shigella</em> is a genus of Gram-negative (i.e., they have a cell wall composed of a thin layer of peptidoglycan), nonmotile, and facultative anaerobic bacteria; whereas <em>Salmonella</em> species are Gram-negative and facultative anaerobic bacteria. Moreover, <em>Salmonella</em> are motile bacteria, in a similar way to other human pathogenic bacteria (e.g., <em>Vibrio cholerae, Pseudomonas aeruginosa</em>, and <em>E. coli</em>). Salmonella can produce hydrogen sulfide (H2S) from thiosulfate or sulfite; whereas <em>Shigella</em> species are unable to produce hydrogen sulfide. Typhoid fever, also known as enteric fever, is an infection caused by <em>S. typhi</em> that can spread throughout the body and affect different organs (i.e., it is a multisystemic illness). Vivotif (Typhoid Vaccine Live Oral Ty21a) is a live attenuated bacterial vaccine used for oral administration only; whereas Vi capsular polysaccharide vaccine (ViCPS) is a vaccine administered by injection. Finally, shigellosis is an infection that affects the digestive system caused by <em>Shigella</em> bacteria. In this regard, <em>S. dysenteriae </em>produces a potent cytotoxin known as 'Shiga toxin' that may cause local destruction of the colonic epithelium.
Answer:
excessive amount of fertiliser can cause high amount of acidic medium to the plant which can lead to death of many microbes necessary for the plant to survive.
there are a certain conditions in which the plants can survive, any change to that or Amy change in habitat will lead the plants to died
Bacteria reproduce asexually through a process called binary fission
So,the correct option is(D