Biology Final Exam

Which statements correctly describe the definition, focus, and scope of Anatomy?

• Definition: The science of body structures.

• Core Focus: Focuses on the physical structure and organization of the human body.

• Key Concept: Examines what the body parts are, how they are built, and their physical relationships to one another

Which statements correctly describe the definition, focus, and underlying sciences of Physiology?

wer:

• Definition: The science of the function of the human body.

• Core Focus: Examines how body parts work and carry out their specific activities.

• Underlying Sciences: Driven by the principles of chemistry and physics.

What is the correct order of structural organization in the human body from simplest to most complex, and at which level does life begin?

• Order: Chemical (atoms to molecules) to Cellular to Tissue to Organ to Organ System to Organism.

• Key Fact: The cellular level is the smallest/simplest unit of life.

Which statements correctly describe homeostasis, its dynamic nature, and how disease relates to it?

• Definition: Maintenance of relatively stable conditions in the internal environment (all organs, tissues, and cells contribute).

• Dynamic Process: Conditions are constantly adjusted within a normal range (e.g., heart rate changing to meet demand).

• Disease: Can be thought of as the disruption of homeostasis.

What is the correct sequence of the homeostatic control pathway, and what is the difference between afferent and efferent pathways?

1. Stimulus: Produces a change in a variable away from desired range.

2. Receptor: Detects the change/stimulus.

3. Afferent Pathway: Carries input information from receptor to the control center.

4. Control Center: Processes information and sets the set point/response.

5. Efferent Pathway: Carries output information from control center to effector.

6. Effector: Carries out response to return variable to homeostatic level.

What are the key differences, frequencies, and examples of negative versus positive feedback mechanisms?

• Negative Feedback (More Common):

  • Mechanism: Body produces a response that counteracts/reverses the change, restoring conditions to normal range.

  • Example: Body temperature rises = sweating increases = body temperature decreases.

• Positive Feedback (Less Common):

  • Mechanism: Body responds by increasing/amplifying the change until an endpoint is reached.

  • Example: Blood clotting or childbirth contractions.

Which statements correctly describe the standard anatomical position, and why is it used?

• Standard Position: Body standing erect, facing observer, head level, eyes facing forward.

• Limbs & Palms: Feet flat on the floor, arms at sides with palms facing forward (supinated).

• Purpose: Serves as a universal reference point to accurately describe body parts relative to one another, regardless of actual body position.

What are the major body planes, and how does each divide the body?

• Sagittal Plane: Vertical plane dividing body into left and right sides.

  • Midsagittal (Median): Divides into equal left and right halves.

  • Parasagittal: Divides into unequal left and right sides.

• Frontal (Coronal) Plane: Vertical plane dividing body into anterior (front) and posterior (back) portions.

• Transverse (Horizontal) Plane: Horizontal plane dividing body into superior (top) and inferior (bottom) portions.

• Oblique Plane: Passes through body at an angle (between vertical and horizontal).

What is the dorsal (posterior) cavity made up of, and what organs does each sub-cavity house?

Dorsal Cavity: Located posteriorly; made up of two main divisions:

1. Cranial Cavity: Houses the brain.

2. Vertebral Cavity: Houses the spinal cord.

What does the ventral (anterior) cavity consist of, and how are its sub-cavities divided?

Ventral (Anterior) Cavity: Consists of two main divisions:

1. Thoracic Cavity: Houses the heart, lungs, and other organs.

2. Abdominopelvic Cavity: Subdivided into two parts:

   • Abdominal Cavity: Contains the digestive and urinary systems.

   • Pelvic Cavity: Contains the reproductive organs.

Which statements correctly describe water as an inorganic compound in the human body?

• Abundance: The most abundant inorganic compound in the body.

• Composition: Formula is $2O; contains no carbon (inorganic).

• Body Weight: Accounts for 50% to 60% of an adult's body weight.

Which 5 properties make water essential to life in the human body?

• Heat Sink: Helps regulate body temperature (high heat capacity).

• Chemical Reactivity: Participates directly in many chemical reactions.

• Cushioning: Protects organs from physical trauma.

• Polarity / Solvent Properties: Acts as a universal solvent, dissolving substances for transport.

• Osmosis / Osmotic Pressure: Regulates fluid movement across biological membranes.

What is heat capacity, what is water's specific heat capacity, and why is it physiologically important?

• Definition: A property of matter describing how much heat can be absorbed or released before a temperature change occurs.

• Water's High Heat Capacity: Water absorbs and releases large amounts of heat with minimal change in temperature.

• Physiological Importance: Helps maintain a stable core body temperature of approximately 37°C.

How does water participate in building and breaking macromolecules, and what is the difference between dehydration synthesis and hydrolysis?

• Dehydration Synthesis (Building): Water molecules are removed from smaller building blocks to join them into larger molecules.

• Hydrolysis (Breaking): Water molecules are added to break the bonds in larger molecules, splitting them into smaller units.

What is water's cushioning function, and what are the 3 specific protective fluids mentioned in the body?

• Function: Acts as a cushion and lubricant to protect body organs.

• 3 Protective Fluids:

  1. Cerebrospinal Fluid (CSF): Protects and cushions the brain and spinal cord.

  2. Amniotic Fluid: Surrounds and protects the fetus.

  3. Synovial Fluid: Lubricates joints and reduces friction during movement.

Which statements correctly define a solution, solute, and solvent, including their amounts and physical states?

• Solution: A homogeneous mixture of two or more components (solute + solvent) resulting in a uniform mixture.

• Solute: The substance that is uniformly dissolved/dispersed; present in smaller amounts (can have more than one in a solution).

• Solvent: The substance in which the solute dissolves; present in larger amounts (only one present in a solution).

• Physical State: Solutes/solvents can be solids, liquids, or gases; the final solution takes on the physical state of the solvent.

Why is water called the universal solvent, and what substances does it dissolve vs. not dissolve?

• Universal Solvent: The most abundant solvent in the human body.

• Polar & Ionic Substances: Hydrophilic ("water-loving"); dissolve well in water (e.g., salts, acids, bases, nutrients, respiratory gases, and wastes).

• Nonpolar Substances: Hydrophobic; generally do not dissolve in water.

• Function: Serves as the primary transport and exchange medium in the body.

What is heat of vaporization, and what is its physiological role in the human body?

• Definition: The amount of heat energy required to transform a liquid into a gas/vapor.

• Physiological Role: When sweat evaporates from the skin surface, it absorbs and removes large amounts of heat energy, providing an efficient cooling mechanism to prevent overheating.

Which statements correctly describe electrolytes, their behavior in water, physiological roles, and the impact of imbalances?

• Definition: Salts that dissociate into ions (positively or negatively charged atoms) in water and can conduct an electrical current.

• Electrical Conduction: Requires water to dissociate ions and conduct electricity.

• Physiological Roles: Essential for normal cell and organ function, including nerve impulse transmission, muscle contraction, and fluid balance.

• Electrolyte Imbalance: Caused by excessive vomiting, diarrhea, or sweating; can cause dangerously low electrolyte levels that are life-threatening.

• Global Health Impact: Diarrhea is a leading cause of death among infants and young children worldwide due to severe dehydration and electrolyte loss.

Which statements correctly describe organic compounds and the 4 main types of macromolecules in the human body?

• Definition of Organic Compound: Molecules that contain carbon atoms bonded to hydrogen atoms.

• Macromolecules: Large molecules that serve as the building materials of the body.

• The 4 Main Types:

  1. Carbohydrates

  2. Lipids (Fats)

  3. Proteins

  4. Nucleic Acids

Which statements correctly describe monomers, polymers, covalent bond formation during synthesis, and polymer breakdown?

• Monomers: Small singular building blocks that join together to form large molecules.

• Polymers: Long chain formations formed by the assembly of many monomers linked through chemical reactions.

• Covalent Bond Formation (Dehydration Synthesis): In many macromolecule building reactions, a covalent bond forms when a hydroxyl group ($-OH$) is removed from one subunit and a hydrogen atom ($-H$) is removed from another subunit (releasing water).

• Polymer Breakdown (Hydrolysis): Disassembling polymers into their component monomers is essentially the reverse of dehydration synthesis (adding water to break bonds).

Which statements correctly describe the general structure, elements, monomers, and bonds of proteins?

• Elemental Composition: Contains Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), and sometimes Sulfur (S).

• Monomers: Long chains of subunits called Amino Acids (20 standard amino acids total).

• Essential vs. Non-Essential:

  • 11 Non-Essential: Can be synthesized by the human body.

  • 9 Essential: Cannot be synthesized by the body; must be obtained from the diet.

• Peptide Bond: The specific covalent bond that links two amino acids together.

• Polypeptide: A polymer formed by a chain of many amino acids.

What are the key differences, shapes, solubility, and examples of Fibrous vs. Globular proteins?

• Fibrous (Structural) Proteins:

  • Role & Shape: Provide mechanical support/strength and bind structures together.

  • Examples: Collagen and Keratin.

• Globular (Functional) Proteins:

  • Role & Shape: Mobile, compact, roughly spherical, and water-soluble.

  • Examples: Hemoglobin, many hormones, antibodies, and enzymes.

Which statements correctly describe enzymes, how they function, and their biological importance?

• Definition: Functional (globular) proteins that act as biological catalysts.

• Catalyst Function: Increases the rate of chemical reactions without being consumed or permanently changed.

• Biological Importance: Crucial because they allow biochemical reactions to occur fast enough to sustain human life.

What are the monomer building blocks and key features of the 4 major macromolecules?

• Proteins: Made of Amino Acids linked by peptide bonds (C, H, O, N, S).

• Carbohydrates: Made of Monosaccharides / simple sugars (C, H, O).

• Lipids: Made of Fatty Acids and Glycerol (nonpolar / hydrophobic).

• Nucleic Acids: Made of Nucleotides (DNA / RNA).

Which statements correctly describe the overall function, elemental composition, size, and monomer components of nucleic acids?

• Primary Function: Store and transmit genetic information and provide instructions for protein synthesis.

• Elemental Composition: Made of Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), and Phosphorus (P).

• Size: The largest biological molecules in the body.

• Monomer Building Block: Composed of subunits called Nucleotides.

• 3 Parts of a Nucleotide:

  1. A sugar (Deoxyribose or Ribose)

  2. A phosphate group

  3. A nitrogenous base

Which statements correctly describe the location, function, sugar, bases, and structure of DNA?

• Location in Human Cells: Mostly found in the nucleus; some is located in the mitochondria.

• Primary Function: Contains genetic instructions for building proteins in the body.

• Sugar Unit: Deoxyribose sugar.

• 4 Nitrogenous Bases: Adenine (A), Thymine (T), Cytosine (C), Guanine (G).

• Structure: Double-stranded (double-chain structure).

What are the key structural and functional differences between RNA and DNA?

• Location: Found in both the nucleus and cytoplasm.

• Primary Function: Carries out the instructions of DNA to build proteins.

• Sugar Unit: Ribose sugar.

• 4 Nitrogenous Bases: Adenine (A), Uracil (U), Cytosine (C), Guanine (G) (Uracil replaces Thymine).

• Structure: Typically a single-stranded chain structure.

Which statements correctly describe the general composition, ratio, function, and examples of monosaccharides?

• Elemental Composition & Ratio: Contains Carbon, Hydrogen, and Oxygen in a $1:2:1$ ratio (e.g., Glucose C6H12O6).

• Primary Function: Provides a readily available and easily used source of energy for cells.

• Monosaccharides: Consist of a single sugar unit (simple sugars).

  • Glucose: Blood sugar and primary energy source for cells.

  • Fructose & Galactose: Metabolized by the body for energy production.

  • Ribose & Deoxyribose: Form part of nucleic acids (RNA/DNA).

What are disaccharides, how are they formed, what are the 3 key pairs/examples, and how are they digested?

• Definition & Formation: Composed of two sugar units formed by dehydration synthesis of two monosaccharides.

• 3 Key Disaccharide Pairs:

  1. Sucrose (Cane sugar) = Glucose + Fructose

  2. Lactose (Milk sugar) = Glucose + Galactose

  3. Maltose (Malt sugar) = Glucose + Glucose

• Digestion: Must be broken down into monosaccharides before they can be absorbed by the digestive system.

Which statements correctly describe polysaccharides and the key differences between Glycogen, Starch, and Cellulose?

• Definition: Long chains of monosaccharides; ideal compact storage molecules (do not taste sweet).

• Glycogen: Storage carbohydrate in animals/humans (stored primarily in liver and muscles).

• Starch: Storage carbohydrate in plants (found in grains and root vegetables).

• Cellulose: Structural carbohydrate in plants; functions as dietary fiber in humans (indigestible).