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Bio 245 Klesath Exam 1 NCSU QUESTIONS AND ANSWERS ALL CORRECT
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Bio 245 Klesath Exam 1 NCSU QUESTIONS ANDANSWERS ALL CORRECT
Course
Bio 245
Question 1: Cell Structure
1. Question: What is the function of the mitochondria in a cell?
o A) Protein synthesis
o B) ATP production
o C) Lipid storage
o D) DNA replication
Answer: B) ATP production
Rationale: Mitochondria are known as the powerhouse of the cell because they
produce ATP (adenosine triphosphate) through aerobic respiration, providing energy
for various cellular functions.
Question 2: Tissue Types
2. Question: Which type of tissue is responsible for transmitting electrical signals
throughout the body?
o A) Epithelial tissue
o B) Connective tissue
o C) Nervous tissue
o D) Muscle tissue
Answer: C) Nervous tissue
Rationale: Nervous tissue is specialized for communication through electrical
impulses. It consists of neurons and glial cells, facilitating the transmission of signals
within the nervous system.
Question 3: Organ Systems
3. Question: Which organ system is primarily responsible for transporting nutrients,
gases, and wastes throughout the body?
o A) Digestive system
o B) Respiratory system
o C) Circulatory system
o D) Endocrine system
Answer: C) Circulatory system
, Rationale: The circulatory system, consisting of the heart, blood vessels, and blood,
is responsible for the distribution of nutrients, oxygen, and the removal of metabolic
wastes throughout the body.
Question 4: Homeostasis
4. Question: What term describes the body's ability to maintain a stable internal
environment?
o A) Adaptation
o B) Homeostasis
o C) Metabolism
o D) Equilibrium
Answer: B) Homeostasis
Rationale: Homeostasis refers to the physiological processes that regulate the internal
environment of the body, ensuring stability despite external changes (e.g.,
temperature, pH).
Question 5: Anatomical Terminology
5. Question: In anatomical terms, what does "proximal" refer to?
o A) Closer to the head
o B) Farther from the midline
o C) Closer to the point of attachment or origin
o D) Farther from the surface
Answer: C) Closer to the point of attachment or origin
Rationale: "Proximal" is a directional term used to describe a position closer to the
trunk or point of attachment of a limb to the body compared to another structure.
Question 6: Membrane Transport
6. Question: Which transport mechanism requires energy (ATP) to move substances
across the plasma membrane against their concentration gradient?
o A) Diffusion
o B) Facilitated diffusion
o C) Osmosis
o D) Active transport
Answer: D) Active transport
, Rationale: Active transport is the process of moving molecules across the membrane
from an area of lower concentration to an area of higher concentration using energy,
often in the form of ATP.
Question 7: Anatomical Regions
7. Question: The thoracic cavity is located:
o A) Above the diaphragm
o B) Below the pelvis
o C) In the abdominal region
o D) Behind the sternum
Answer: A) Above the diaphragm
Rationale: The thoracic cavity is the chamber of the body enclosed by the rib cage,
located above the diaphragm and housing vital organs such as the heart and lungs.
Question 8: Histology
8. Question: What type of epithelial tissue is characterized by a single layer of flat cells?
o A) Stratified squamous epithelium
o B) Cuboidal epithelium
o C) Simple squamous epithelium
o D) Columnar epithelium
Answer: C) Simple squamous epithelium
Rationale: Simple squamous epithelium consists of a single layer of flat cells, making
it ideal for areas where diffusion or filtration occurs, such as in the alveoli of the
lungs.
Question 9: Body Cavities
9. Question: Which of the following cavities contains the lungs?
o A) Abdominal cavity
o B) Pelvic cavity
o C) Thoracic cavity
o D) Cranial cavity
Answer: C) Thoracic cavity
Rationale: The thoracic cavity is the part of the body that houses the lungs and heart,
enclosed by the ribs and diaphragm.
, Question 10: Cellular Components
10. Question: What structure regulates the entry and exit of substances in and out of the
cell?
o A) Nucleus
o B) Mitochondria
o C) Plasma membrane
o D) Ribosomes
Answer: C) Plasma membrane
Rationale: The plasma membrane is a selective barrier that controls the movement of
substances in and out of the cell, maintaining homeostasis and allowing
communication with the external environment.
Question 11: Blood Components
11. Question: Which component of blood is primarily responsible for transporting
oxygen?
o A) Plasma
o B) White blood cells
o C) Platelets
o D) Red blood cells
Answer: D) Red blood cells
Rationale: Red blood cells (erythrocytes) contain hemoglobin, which binds to oxygen
and facilitates its transport throughout the body.
Question 12: Muscle Tissue Types
12. Question: Which type of muscle tissue is under involuntary control and is found in
the walls of internal organs?
o A) Skeletal muscle
o B) Cardiac muscle
o C) Smooth muscle
o D) Connective tissue
Answer: C) Smooth muscle
Rationale: Smooth muscle is an involuntary muscle found in the walls of hollow
organs such as the intestines and blood vessels, facilitating movements like peristalsis.
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