BIO 253 LATEST 2026 TEST PAPER QUESTIONS AND
SOLUTIONS RATED A+
✔✔What is nervous tissue - ✔✔Brain spinal cord nerve tissue
✔✔Simple squamous - ✔✔Allows diffusion of substance across
Capillaries and alveoli
✔✔simple cuboidal epithelium - ✔✔secretion and absorption
Gland and kidney tubules
✔✔Simple columnar - ✔✔Forms the lining of the stomach and small intestine
Absorbs nutrients
✔✔Stratified squamous - ✔✔skin
✔✔Pseudostratified columnar - ✔✔Respiratory tract
✔✔What are osteoblast - ✔✔Bone building cells
✔✔What are osteocytes - ✔✔mature bone cells
✔✔Osteoclast - ✔✔Crash or break bone
✔✔Fibroblast - ✔✔cell that forms collagen fibers
✔✔Where are melanocytes located - ✔✔In the stratum basale
✔✔What is the visceral peritoneum? - ✔✔covers organs
✔✔What does parietal mean - ✔✔Lining the wall of the cavity
✔✔What is extracellular Matrix - ✔✔nonliving material found between cells in
connective tissue
✔✔What is the extracellular Matrix of bone - ✔✔Calcium phosphate
✔✔Extracellular Matrix of blood - ✔✔Plasma
✔✔Extracellular Matrix of cartilage - ✔✔Semi-solid protein matrix
, ✔✔Cavities of body - ✔✔
✔✔What does the dorsal cavity contain - ✔✔brain and spinal cord
✔✔What does the ventral cavity contain - ✔✔thoracic cavity and abdominopelvic cavity
✔✔What does the mediastinum contain - ✔✔esophagus, trachea, heart, great vessels
✔✔What does the abdominal cavity contain - ✔✔stomach, liver, intestines
✔✔What does the pelvic cavity contain - ✔✔urinary bladder, reproductive organs,
rectum
✔✔What is a hydrogen bond? - ✔✔a weak bond between two molecules
Sharing electrons but not evenly
Organic solvent that may pull ionic bonds apart
✔✔What is cholesterol - ✔✔Steroid found in the plasma membrane surrounding every
body cell
Help stabilize cellular structure that cells must use to survive
✔✔Primary protein structure - ✔✔sequence of amino acids
✔✔Secondary protein structure - ✔✔When to change coil or bend into pleated sheet
✔✔Tertiary protein structure - ✔✔occurs when certain attractions are present between
alpha helices and pleated sheets
✔✔How do proteins denature - ✔✔Temperature
pH
Radiation
Hazardous chemicals
✔✔Cytoplasm - ✔✔A jellylike fluid inside the cell in which the organelles are suspended
✔✔Cell membrane - ✔✔A cell structure that controls which substances can enter or
leave the cell.
✔✔Smooth Endoplasmic Reticulum - ✔✔An endomembrane system where lipids are
synthesized, calcium levels are regulated, and toxic substances are broken down.
✔✔Ribosomes - ✔✔site of protein synthesis
SOLUTIONS RATED A+
✔✔What is nervous tissue - ✔✔Brain spinal cord nerve tissue
✔✔Simple squamous - ✔✔Allows diffusion of substance across
Capillaries and alveoli
✔✔simple cuboidal epithelium - ✔✔secretion and absorption
Gland and kidney tubules
✔✔Simple columnar - ✔✔Forms the lining of the stomach and small intestine
Absorbs nutrients
✔✔Stratified squamous - ✔✔skin
✔✔Pseudostratified columnar - ✔✔Respiratory tract
✔✔What are osteoblast - ✔✔Bone building cells
✔✔What are osteocytes - ✔✔mature bone cells
✔✔Osteoclast - ✔✔Crash or break bone
✔✔Fibroblast - ✔✔cell that forms collagen fibers
✔✔Where are melanocytes located - ✔✔In the stratum basale
✔✔What is the visceral peritoneum? - ✔✔covers organs
✔✔What does parietal mean - ✔✔Lining the wall of the cavity
✔✔What is extracellular Matrix - ✔✔nonliving material found between cells in
connective tissue
✔✔What is the extracellular Matrix of bone - ✔✔Calcium phosphate
✔✔Extracellular Matrix of blood - ✔✔Plasma
✔✔Extracellular Matrix of cartilage - ✔✔Semi-solid protein matrix
, ✔✔Cavities of body - ✔✔
✔✔What does the dorsal cavity contain - ✔✔brain and spinal cord
✔✔What does the ventral cavity contain - ✔✔thoracic cavity and abdominopelvic cavity
✔✔What does the mediastinum contain - ✔✔esophagus, trachea, heart, great vessels
✔✔What does the abdominal cavity contain - ✔✔stomach, liver, intestines
✔✔What does the pelvic cavity contain - ✔✔urinary bladder, reproductive organs,
rectum
✔✔What is a hydrogen bond? - ✔✔a weak bond between two molecules
Sharing electrons but not evenly
Organic solvent that may pull ionic bonds apart
✔✔What is cholesterol - ✔✔Steroid found in the plasma membrane surrounding every
body cell
Help stabilize cellular structure that cells must use to survive
✔✔Primary protein structure - ✔✔sequence of amino acids
✔✔Secondary protein structure - ✔✔When to change coil or bend into pleated sheet
✔✔Tertiary protein structure - ✔✔occurs when certain attractions are present between
alpha helices and pleated sheets
✔✔How do proteins denature - ✔✔Temperature
pH
Radiation
Hazardous chemicals
✔✔Cytoplasm - ✔✔A jellylike fluid inside the cell in which the organelles are suspended
✔✔Cell membrane - ✔✔A cell structure that controls which substances can enter or
leave the cell.
✔✔Smooth Endoplasmic Reticulum - ✔✔An endomembrane system where lipids are
synthesized, calcium levels are regulated, and toxic substances are broken down.
✔✔Ribosomes - ✔✔site of protein synthesis
