The immunoglobulin fragment characterized by a molecular weight of roughly 50000_________________?
Show answer Hide answer
Answer: B. H chain
Explanation
The heavy chain of an immunoglobulin molecule is significantly larger than the light chain component. Each heavy chain possesses a molecular weight of approximately 50,000 daltons in a standard antibody structure. This substantial molecular weight reflects the larger amino acid sequence and multiple constant domains of the heavy chain. Immunoglobulins are composed of two identical heavy chains and two identical light chains linked by disulfide bonds. The heavy chain determines the isotype class of the antibody, such as IgG, IgM, IgA, IgD, or IgE. Daltons are standard units used in biochemistry to express the molecular weight of proteins and macromolecules.
Option A refers to the secretory piece, which has a different molecular weight and protects polymeric immunoglobulins. Option C refers to the light chain, which is much smaller with a molecular weight around 25,000 daltons. Option D refers to the joining peptide found in polymeric antibodies, which has a distinct smaller size.
Related questions
Q1. Patients who have undergone organ transplantation are most frequently susceptible to infections by______________?
Show answer Hide answer
Answer: C. CMV
Cytomegalovirus is the most common opportunistic viral infection affecting solid organ transplant recipients. Immunosuppressive medications required to prevent organ rejection reactivate latent cytomegalovirus infections...
Q2. Who is credited with the discovery of physical sterilization techniques? __________________?
Show answer Hide answer
Answer: B. Joeph Lister
Joseph Lister transformed modern surgical practice by introducing antiseptic techniques and chemical agents. He utilized carbolic acid to sterilize surgical instruments, wounds, and dressings in the operating room. His p...
Q3. What are the primary characteristics of a plasmid? __________________?
Show answer Hide answer
Answer: E. Both A & B
Plasmids are extrachromosomal DNA molecules that replicate independently from the host bacterial chromosomal DNA. Many conjugative plasmids encode specific genes that facilitate the formation of sex pili to mediate cell-...
Q4. A negative phase is commonly observed during the development of ________ immunity?
Show answer Hide answer
Answer: A. Active
Active immunization can sometimes feature a temporary negative phase where antibody levels dip. This initial dip occurs as administered antigens bind to existing circulating antibodies temporarily. Following this clearan...
Q5. Which statement regarding prions is correct____________?
Show answer Hide answer
Answer: A. Readily inactivated by autoclave at 121 C
Prions are abnormally folded proteins that exhibit extreme resistance to conventional chemical and physical sterilization methods, including standard autoclaving at 121°C.
Q6. How are pneumococci distinguished from streptococci________________?
Show answer Hide answer
Answer: D. Bile solubility
Pneumococci possess autolytic enzymes that are activated in the presence of bile salts. Adding bile to a culture causes pneumococcal cells to lyse rapidly and clear the suspension. Other alpha-hemolytic streptococci lack...