Biology

Dr. James Watson, along with Francis Crick, discovered the double helix structure of DNA in 1953, which is a well-documented historical fact in molecular biology.

Tuberculosis is caused by the bacterium Mycobacterium tuberculosis, making it a bacterial infection.

Plasma constitutes about 55% of human blood by volume, making option B the correct answer. The other options are either too low or too high compared to the accepted average percentage.

The human eye is often estimated to have a resolution roughly equivalent to about 570 megapixels, based on the density of photoreceptors and the field of view. This makes option A the closest and most accepted estimate among the choices.

Parkinson's disease primarily affects the brain, specifically the neurons that produce dopamine, leading to motor control issues. It is not related to the eyes, heart, or lungs.

The outermost layer of human skin is called the epidermis. It serves as a protective barrier against environmental factors.

Prolactin is the hormone responsible for stimulating milk production in the mother's breast. Oxytocin, while important for milk ejection, does not initiate milk production. FSH and ADH are unrelated to lactation.

Blood is a tissue composed of cells suspended in plasma, making it a connective tissue. Lungs, kidney, and pancreas are organs, not tissues.

Tetanus is caused by the bacterium Clostridium tetani, making it a bacterial infection. It is not caused by viruses, fungi, or parasites.

The liver is the largest gland in the human body, responsible for many vital functions including detoxification, protein synthesis, and production of biochemicals necessary for digestion.