ESTUDYR
BIOL 106 STUDY SET UPDATED EXAM WITH MOST TESTED
QUESTIONS AND ANSWERS | GRADED A+ | ASSURED SUCCESS
WITH DETAILED RATIONALES
1. A respiratory surface must have which of the following characteristics to be effective?
A. Thick epithelium, low surface area, no ventilation
B. Thin (simple squamous) epithelium, high surface area, ventilation to maintain
gradients
C. Keratinized layers and no blood supply
D. Multilayered epithelium with dense connective tissue
Rationale: Gas exchange requires thin membranes, large area, and maintained
concentration gradients.
2. An open circulatory system is best described as:
A. Blood confined to vessels at all times
B. Hemolymph pumped by hearts into sinuses bathing organs
C. Direct oxygen delivery via tracheae only
D. Closed capillary networks with lymphatic return
Rationale: In open systems hemolymph leaves vessels and fills body sinuses.
3. Which statement about a closed circulatory system is correct?
A. Hemolymph freely mixes with interstitial fluid
B. It is found in most mollusks and insects only
C. Blood remains confined to vessels and is distinct from interstitial fluid
D. It lacks a heart or pumping organ
Rationale: Closed systems maintain blood in vessels separate from tissue fluid.
4. Which is NOT a major function of blood?
A. Transport gases and nutrients
B. Remove wastes
C. Immune cell transport
D. Convert sunlight into chemical energy
Rationale: Converting sunlight is a photosynthetic function, not a blood function.
5. Hemocyanin is distinct from hemoglobin because it:
A. Is iron-based and red when oxygenated
B. Is copper-based and blue when oxygenated
C. Is a pigment only in vertebrates
, ESTUDYR
D. Binds CO₂ preferentially over O₂
Rationale: Hemocyanin uses copper; oxygenation yields blue color.
6. Chlorocruorin is primarily:
A. Copper-based and red
B. A respiratory pigment in vertebrates
C. Iron-based and green when oxygenated in some annelids
D. A hemoglobin variant in mammals
Rationale: Chlorocruorin is iron-based and appears green in certain annelids.
7. Which of the following is a class within Phylum Mollusca?
A. Insecta
B. Gastropoda
C. Chilopoda
D. Nematoda
Rationale: Gastropoda (snails, slugs) is a major molluscan class.
8. The mantle in molluscs primarily functions to:
A. Digest food particles
B. Pump hemolymph through sinuses
C. Secrete the shell and form the mantle cavity for gas exchange
D. Act as a sensory antenna
Rationale: The mantle secretes shell material and forms the cavity for
respiration/excretion.
9. The radula is best described as:
A. A water-filtering organ in bivalves
B. A tongue-like organ with chitinous teeth used for scraping food
C. A circulatory pump in cephalopods
D. A reproductive structure
Rationale: Radula is a rasping feeding organ found in most molluscs.
10. Which molluscan class typically has a reduced shell and a closed circulatory system?
A. Bivalvia
B. Gastropoda
C. Cephalopoda
D. Polyplacophora
Rationale: Cephalopods (squid, octopus) have closed circulation and reduced/absent
shells.
BIOL 106 STUDY SET UPDATED EXAM WITH MOST TESTED
QUESTIONS AND ANSWERS | GRADED A+ | ASSURED SUCCESS
WITH DETAILED RATIONALES
1. A respiratory surface must have which of the following characteristics to be effective?
A. Thick epithelium, low surface area, no ventilation
B. Thin (simple squamous) epithelium, high surface area, ventilation to maintain
gradients
C. Keratinized layers and no blood supply
D. Multilayered epithelium with dense connective tissue
Rationale: Gas exchange requires thin membranes, large area, and maintained
concentration gradients.
2. An open circulatory system is best described as:
A. Blood confined to vessels at all times
B. Hemolymph pumped by hearts into sinuses bathing organs
C. Direct oxygen delivery via tracheae only
D. Closed capillary networks with lymphatic return
Rationale: In open systems hemolymph leaves vessels and fills body sinuses.
3. Which statement about a closed circulatory system is correct?
A. Hemolymph freely mixes with interstitial fluid
B. It is found in most mollusks and insects only
C. Blood remains confined to vessels and is distinct from interstitial fluid
D. It lacks a heart or pumping organ
Rationale: Closed systems maintain blood in vessels separate from tissue fluid.
4. Which is NOT a major function of blood?
A. Transport gases and nutrients
B. Remove wastes
C. Immune cell transport
D. Convert sunlight into chemical energy
Rationale: Converting sunlight is a photosynthetic function, not a blood function.
5. Hemocyanin is distinct from hemoglobin because it:
A. Is iron-based and red when oxygenated
B. Is copper-based and blue when oxygenated
C. Is a pigment only in vertebrates
, ESTUDYR
D. Binds CO₂ preferentially over O₂
Rationale: Hemocyanin uses copper; oxygenation yields blue color.
6. Chlorocruorin is primarily:
A. Copper-based and red
B. A respiratory pigment in vertebrates
C. Iron-based and green when oxygenated in some annelids
D. A hemoglobin variant in mammals
Rationale: Chlorocruorin is iron-based and appears green in certain annelids.
7. Which of the following is a class within Phylum Mollusca?
A. Insecta
B. Gastropoda
C. Chilopoda
D. Nematoda
Rationale: Gastropoda (snails, slugs) is a major molluscan class.
8. The mantle in molluscs primarily functions to:
A. Digest food particles
B. Pump hemolymph through sinuses
C. Secrete the shell and form the mantle cavity for gas exchange
D. Act as a sensory antenna
Rationale: The mantle secretes shell material and forms the cavity for
respiration/excretion.
9. The radula is best described as:
A. A water-filtering organ in bivalves
B. A tongue-like organ with chitinous teeth used for scraping food
C. A circulatory pump in cephalopods
D. A reproductive structure
Rationale: Radula is a rasping feeding organ found in most molluscs.
10. Which molluscan class typically has a reduced shell and a closed circulatory system?
A. Bivalvia
B. Gastropoda
C. Cephalopoda
D. Polyplacophora
Rationale: Cephalopods (squid, octopus) have closed circulation and reduced/absent
shells.
