Recent questions in Biology

During protoplast isolation, after naked protoplast is released in pectinase, cellulase enzyme mixture, it is fused by which substance that gives low toxicity to the cells ?

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During in-vitro micropropagation, the favorable condition for shoot multiplication would require which growth regulators ?

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In eukaryotes, which is the initiating amino acid ?

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During translation in prokaryotes, which sequence lies 5' to the AUG initiation codon and is the binding site for the 30S ribosomal subunit ?

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Eukaryotic ribosome has a sedimentation coefficient of 80S with subunits of _______.

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In prokaryotic ribosome, one of the binding sites for tRNA is P site which is responsible for ?

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The attachment of an amino acid to a tRNA is catalyzed by which enzyme ?

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Most amino acids in proteins are specified by more than one codon. Therefore, genetic codon is said to be

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Which amino acids are represented by a single codon ?

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During translation, the sequence of an mRNA molecule is read by _____________.

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Each codon is recognized by a triplet of bases, called an anticodon which is present in _____.

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Which of these are termination or stop codons ?

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Which enzyme is able to degrade cellulose that are absent in mammals but are produced by some bacteria, fungi and protozoa ?

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Which genetic disease is caused by an inability to convert galactose to glucose ?

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Sucrose is (a) non reducing sugar and (b) disaccharide.

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In glycolysis, glucose is phosphorylated by ATP to form glucose 6-phosphate and ADP. This reaction is catalyzed by which enzyme ?

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Starch is the mixture of two polysaccharide forms called

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Bacteria and yeasts store glucose as polysaccharide called

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Which bond is formed between the anomeric carbon of the sugar and a nitrogen atom of the base of an ATP molecule ?

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D-glucose and D-galactose differ only in their configuration at C-4, thus called

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Fluid mosaic model of biological membranes was proposed by

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which of the photosynthetic reactions use the $NADPH$ and $ATP$ to synthesize carbohydrate from $CO_2$ and $H_2O$ ?

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Which bond between the carbon and nitrogen exhibits partial double bond character ?

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Which of the oxygen-binding protein stores the oxygen in the muscles ?

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Disorders like porphyrias occur due to

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Hemes and chlorophylls are both members of the family of pigments called

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Increase in the amount of ammonia in the blood leads to

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In fireflies, the generation of a light flash requires activation of luciferin by an enzymatic reaction involving pyrophosphate cleavage of which molecule to form luciferyl adenylate ?

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Flavoproteins in cryptochromes and photolyases also serve as

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NAD and NADP are bound to dehydrogenases in a widely conserved structural motif called the

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If equilibrium constant K'eq of a given chemical reaction is 1.0, the standard free energy change G' o of that reaction is

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The free-energy change G, a spontaneously reacting system is always

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TH cells generally recognize antigen combined with which class of MHC molecules ?

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The immunologically active regions on a complex antigen that actually bind to B-cell or T-cell receptors are known as

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Which primary lymphoid organs are the maturation site for lymphocytes ?

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Langerhans cells and myeloid cells are which type of cells ?

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Movement of circulating neutrophils into tissues is known as

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Which of the granulocytic cells cytoplasm stains with the basic dye methylene blue ?

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Which of the granulocytic cells have bilobed nucleus ?

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The maturation site for T-lymphocytes is

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All blood cells arise from which type of cells ?

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Macrophages in the connective tissue is called

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Sickle cell anemia disease molecular basis, is the change of which amino acid residue for a valine at position 6 of the ?-chain ?

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Katal (kat) is the unit of

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Antibody found in the blood after antigen stimulation and also has the ability to cross placenta is

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Pyruvate produced by glycolysis in muscle is converted to lactate by which enzyme ?

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Leghemoglobin is used to protect the nitrogenase in the Rhizobium from inactivation by

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The disorder, alkaptonuria is caused by the absence of which enzyme ?

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For the clinical diagnosis of a myocardial infarction, which enzymes are measured ?

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Which compound stabilizes tubulin in microtubules and promotes polymerization?

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