Which Uttar Pradesh-based scientist was awarded the Shanti Swarup Bhatnagar Prize in 2021 for his work on G protein-coupled receptors (GPCRs)?

Correct option is C

The correct answer is (c) Dr. Arun Kumar Shukla
Explanation: . Dr. Arun Kumar Shukla, a notable Indian structural biologist, was a recipient of the Shanti Swarup Bhatnagar Prize for Science and Technology in 2021. . He was awarded in the Biological Sciences category for his outstanding contributions to the understanding of G protein-coupled receptors (GPCRs), their activation, signaling, and regulation. . Dr. Shukla holds a position at the Department of Biological Sciences and Bioengineering at the Indian Institute of Technology (IIT) Kanpur, which is located in Uttar Pradesh. 
Information Booster: . GPCRs are the largest family of membrane proteins and are major targets for modern medicines. . Dr. Shukla's research has identified novel strategies to modulate GPCR functions for designing new therapeutics with minimal side effects. . He also received the prestigious Infosys Prize in 2023 in Life Sciences for his significant scientific contributions. 
Additional Knowledge: Dr. B.N. Suresh (Option a) . Dr. B.N. Suresh is an aerospace scientist and former Director of the Vikram Sarabhai Space Centre (VSSC), known for his work in ISRO and space technology. He is not associated with this specific prize or research area.
Dr. R.A. Mashelkar (Option b) . Dr. R.A. Mashelkar is a well-known chemical engineer and former Director General of the Council of Scientific & Industrial Research (CSIR). He received various high honors earlier in his career but not this specific award in 2021.
Dr. Ranjana R.M. (Option d) . This name does not appear in the official list of recipients for the Shanti Swarup Bhatnagar Prize in 2021.