An iron-bearing specialized protein is referred to as _________ ?
Show answer Hide answer
Answer: B. Hemoglobin
Explanation
Hemoglobin is a specialized iron-bearing metalloprotein found inside vertebrate red blood cells. The iron atoms embedded within its structure bind loosely and reversibly to oxygen molecules. This specialized protein design allows efficient oxygen transport from lungs to body tissues. Metalloproteins are functional proteins containing essential metal ion cofactors in their structure. Red blood cells lack nuclei to maximize internal space for carrying millions of hemoglobin molecules. The respiratory pigment gives arterial blood its characteristic bright red color upon oxygenation.
Medical doctors measure hemoglobin levels in blood tests to diagnose anemia and fatigue conditions. Altitude adaptation causes the human body to produce more hemoglobin to compensate for low oxygen. Biochemists study metalloprotein structures to understand how iron binds oxygen without undergoing oxidation. Hormones are chemical messenger molecules secreted by endocrine glands rather than iron proteins. Red blood cell is the entire cellular vehicle rather than the specific iron-bearing protein inside. White blood cell defends the body against infections and does not primarily transport oxygen.
Related questions
Q1. To date, approximately _____________ animal species have been cataloged?
Show answer Hide answer
Answer: C. 1
While millions of animal species exist, historical questions in this set sometimes match specific textbook options where '1 million' or similar figures are referenced; however, modern estimates are much higher. Let's ver...
Q2. Snails are classified under_________?
Show answer Hide answer
Answer: A. gastropods
Snails are classified scientifically as gastropods, possessing a broad muscular foot for locomotion. Their anatomy features a visceral mass enclosed within a single, usually coiled calcareous shell. Taxonomists group sna...
Q3. Solanum tuberosum functions as the binomial nomenclature for___________?
Show answer Hide answer
Answer: C. Potato
Solanum tuberosum is the internationally accepted scientific binomial nomenclature for the common potato. Carl Linnaeus established this formal two-part naming system to classify plant species globally. Botanical nomencl...
Q4. Spirochetes serve as an example of___________?
Show answer Hide answer
Answer: B. Anaerobic bacteria
Spirochetes are helical, flexible bacteria that thrive in anaerobic or microaerophilic environments. These specialized microorganisms do not require high levels of atmospheric oxygen for survival. Their unique corkscrew...
Q5. Globular or tubular membrane networks dividing endoplasmic reticulum contents from cytoplasm are known as__________?
Show answer Hide answer
Answer: B. Cisternae
Cisternae are flattened, membrane-bound sac-like structures that form the endoplasmic reticulum network. These tubular membrane networks divide internal organelle contents from the surrounding cell cytoplasm. Their folde...
Q6. Sperm cells shed into aquatic environments reach the sponge mesenchyme via__________?
Show answer Hide answer
Answer: A. Amoeboid cell
In sponges, wandering amoeboid cells transport captured sperm cells through the mesenchyme to eggs. These specialized mobile cells migrate internally to facilitate internal fertilization processes. Amoeboid transport bri...