List of top Biological Science Questions

Which of the following combinations of the statements about photorespiration is CORRECT? (P) Photorespiration generates no ATP
(Q) Photorespiration produces no glucose
(R) Photorespiration releases O\(_2\)
(S) Photorespiration does not occur in C\(_4\) plants
Which of the following statements are TRUE for hexokinase and glucokinase?
Phospho-mimic mutants of proteins can be generated by replacing
A bacterium that arose 3.5 billion years ago divides once every 12 hours. Under ideal conditions, the number of generations the bacterium has undergone will be approximately:
In human reproduction, (P) spermatogenesis starts at puberty
(Q) oogenesis starts at fetal stage
(R) following meiosis, one oogonium produces 4 eggs
(S) following meiosis, one spermatogonium produces 4 sperms
Which of the following techniques can be used to detect protein-protein interactions in-vivo?
(P) Two hybrid assay
(Q) Fluorescence resonance energy transfer
(R) Fluorescence recovery after photobleaching
(S) Gel-shift assay
The predominant mechanism of microRNA mediated regulation of gene expression is inhibition of:
3'-Azido-2',3'-dideoxy thymidine (AZT) with the structure shown above has potential to work as a drug against HIV because:
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During synthesis of N-linked glycosylated proteins in mammalian cells, which one of the following compositions of sugars is originally added as a core through dolichol-phosphate precursor?
A dihybrid phenotypic ratio of 15:1 was obtained while making a cross of AaBb × AaBb. This is an example of:
The function \( y = 1 \) is an equation of a:
Bottle X contains 1 L of water, while bottle Y, which has the same capacity as X, is empty. Water is poured from bottle X to Y. The plot of the quantity of water in Y as a function of the quantity of water in X is:
Which one of the following combinations showing the chromosome numbers for human cells is CORRECT?
The derivative of \( 2^x \) with respect to \( x \) is:
An example of transcytosis is:
On infection by a specific virus, a host generates cytotoxic T cells that kill:
In mammals, which one of the following vitamins is required in amino group transfer reaction?
'Philadelphia chromosome' is NOT linked to
Match the endocrine gland in Group A with the hormone secreted by them in Group B:
% Table for Groups\[\begin{array}{|c|c|} \hline Group A & Group B \\ \hline \text{(P) Anterior Pituitary} & \text{(i) Melatonin} \\ \hline \text{(Q) Thyroid} & \text{(ii) Glucocorticoids} \\ \hline \text{(R) Adrenal} & \text{(iii) Prolactin} \\ \hline \text{(S) Pineal} & \text{(iv) Calcitonin} \\ \hline \end{array}\]
A plant producing white flower with white seed coat (dominant) was crossed with a plant producing violet flower with gray seed coat (recessive). Upon selfing of 144 F2 progeny plants, the number of plants continuing to produce violet flower with gray seed coat will be:
Decreasing the concentration of sodium ions from double stranded DNA solution results in decrease in Tm. This happens because of increased
During pre-mRNA splicing reaction, a lariat RNA is formed when the intron cleaved at the 5' splice site gets linked by a
Which one of the following microscopes has working principle most similar to the way a blind person reads?
Lysosomal targeting of proteins involves recognition of
In vitro, group I introns have the ability to