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Which of the following sentence is true or false ? (symbol for true is T and for false is F)
i. message forthe synthesis of a specific protein is present in DNA
ii. cytosine base is derivatives of pyrimidine
iii. $ \beta $ -D ribose sugar present in DNA iv. DNA is the exclusively responsible for maintaining the identity of different species of organism upto 100 years
what are alpha - D+glucose & beta - D + glucose?
Alpha-D-glucose and beta-D-glucose are anomers. Anomers are a type of stereoisomer and specifically differ at the anomeric carbon. For glucose, this is the carbon-1 (C1) position. In alpha-D-glucose, the OH group attached to C1 is on the opposite side (trans) of the CH2OH group, whereas in beta-D-glucose, the OH group on C1 is on the same side (cis) as the CH2OH group.
which statement is appropriate for anomer of glucose ?
Anomers are isomers of glucose that differ in structure specifically at the anomeric carbon (C1) position. This means that their structure changes around the C1 carbon atom, which is the carbon that was part of the carbonyl group in the open-chain form of the sugar. Therefore, the correct statement is 'they are isomers of glucose which contain different structure with $C_1$,' which corresponds to option 2.
P is responsible for heredity & P is formed by Q and R. So give the name for P, Q and R.
Which of the following is ionic ?
Electronegative difference in KI is more
According to valence-bond theory which magnetic property oxygen possess ?
According to valence-bond theory, oxygen molecule (O2) is paramagnetic. This is due to the presence of two unpaired electrons in its molecular orbital configuration, which makes it attracted to a magnetic field.
Who was proposed valence-bond theory ?
In $H - C \equiv C - CH = CH_2 molecule C^3 - C^2$ single bond carbons has which type of hybridization ?
Here C - C contain double and triple bond
Which of the following pair of species is isoelectronic and same structure ?
$NO_3 ^ - and CO_3^ {2-} contains 32 e- so they are iso electric ions Both possess sp^2$ hybridization
Which of the following sentence is incorrect for covalent bond ?
Covalent bonds are directional because the shared electrons are located between the nuclei of the bonded atoms, which gives a specific orientation to the bond. This directionality is crucial for the formation of specific molecular shapes.
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