BIO 243 EXAM 1 QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2025/2026
Human Blood p.H - Answers 7.35-7.45
Buffers - Answers Chemicals that combine with excess acids or bases to help minimize pH
changes in body fluids
positive feedback - Answers Feedback that tends to cause the level of a variable to change in
the same direction as an initial change
Ex: Labor Contractions, Blood Clotting
Negative Feedback - Answers The most common homeostatic control mechanism. The net
effect is that the output of the system shuts off the original stimulus or reduce its intensity
Ex: Regulating body temp
Characteristics of Enzymes - Answers Functional enzyme has holoenzyme & apoenzyme and a
cofactor.
Most enzymes have a suffix -ase
pH greater than 7 - Answers Base
pH less than 7 - Answers Acid
What are the 3 reactions of cellular respiration - Answers Glycolysis, citric acid cycle, electron
transport chain
Beta Oxidation - Answers The process by which fatty acid molecules are broken down in the
mitochondria to generate acetyl-coA for (TCA) & NADH, FADHZ to be used by the electron
transport chain
Deamination - Answers The process of removing the amino group from amino acid
DNA - Answers A-T
G-C
double-stranded
RNA - Answers A, G, C, U
A-U &G-C
single- stranded
homeostasis - Answers ability to maintain relatively stable internal conditions even though the
outside world changes continuously
, Dorsal Cavity - Answers contains the cranial cavity and the vertebral cavity
What does the cranial cavity contain - Answers Brain
What does the vertebral cavity contain - Answers Spinal Cord
Ventral Cavity - Answers contains the thoracic cavity and the abdominopelvic cavity
what does the thoracic cavity contain - Answers mediastinum, plueral cavity, pericardial cavity
what does the mediastinum contain - Answers esophagus, thymus, heart, trachea
what does the pleural cavity contain - Answers lungs
what does the pericardial cavity contain - Answers heart
what does the abdominopelvic cavity contain - Answers abdominal cavity, pelvic cavity,
retroperitoneal
what does the abdominal cavity contain - Answers liver, spleen, stomach, S & L intestines
what does the pelvic cavity contain - Answers bladder, internal genitalia
what does retroperitoneal contain - Answers kidney & pancreas
tonicity - Answers the ability of a solution to change the shape or tone of cells by altering the
cells internal water volume
Function of Atoms - Answers tiny building blocks of matter
Function of molecules - Answers atoms joined together
function of organelles - Answers basic components of cells
function of cells - Answers smallest unit of living things
tissues - Answers groups of cells with common function
organs - Answers a structure composed of at least 2 tissue types
organ system - Answers groups of organs working together
Adenosine Triphosphate - Answers organic molecules that stores and releases chemical energy
for use in body cells
-cell uses ATP for many functions including active transport & synthesis of various compounds
Cell Cycle - Answers Interphase
Cell Division (Miotic Phase)
Human Blood p.H - Answers 7.35-7.45
Buffers - Answers Chemicals that combine with excess acids or bases to help minimize pH
changes in body fluids
positive feedback - Answers Feedback that tends to cause the level of a variable to change in
the same direction as an initial change
Ex: Labor Contractions, Blood Clotting
Negative Feedback - Answers The most common homeostatic control mechanism. The net
effect is that the output of the system shuts off the original stimulus or reduce its intensity
Ex: Regulating body temp
Characteristics of Enzymes - Answers Functional enzyme has holoenzyme & apoenzyme and a
cofactor.
Most enzymes have a suffix -ase
pH greater than 7 - Answers Base
pH less than 7 - Answers Acid
What are the 3 reactions of cellular respiration - Answers Glycolysis, citric acid cycle, electron
transport chain
Beta Oxidation - Answers The process by which fatty acid molecules are broken down in the
mitochondria to generate acetyl-coA for (TCA) & NADH, FADHZ to be used by the electron
transport chain
Deamination - Answers The process of removing the amino group from amino acid
DNA - Answers A-T
G-C
double-stranded
RNA - Answers A, G, C, U
A-U &G-C
single- stranded
homeostasis - Answers ability to maintain relatively stable internal conditions even though the
outside world changes continuously
, Dorsal Cavity - Answers contains the cranial cavity and the vertebral cavity
What does the cranial cavity contain - Answers Brain
What does the vertebral cavity contain - Answers Spinal Cord
Ventral Cavity - Answers contains the thoracic cavity and the abdominopelvic cavity
what does the thoracic cavity contain - Answers mediastinum, plueral cavity, pericardial cavity
what does the mediastinum contain - Answers esophagus, thymus, heart, trachea
what does the pleural cavity contain - Answers lungs
what does the pericardial cavity contain - Answers heart
what does the abdominopelvic cavity contain - Answers abdominal cavity, pelvic cavity,
retroperitoneal
what does the abdominal cavity contain - Answers liver, spleen, stomach, S & L intestines
what does the pelvic cavity contain - Answers bladder, internal genitalia
what does retroperitoneal contain - Answers kidney & pancreas
tonicity - Answers the ability of a solution to change the shape or tone of cells by altering the
cells internal water volume
Function of Atoms - Answers tiny building blocks of matter
Function of molecules - Answers atoms joined together
function of organelles - Answers basic components of cells
function of cells - Answers smallest unit of living things
tissues - Answers groups of cells with common function
organs - Answers a structure composed of at least 2 tissue types
organ system - Answers groups of organs working together
Adenosine Triphosphate - Answers organic molecules that stores and releases chemical energy
for use in body cells
-cell uses ATP for many functions including active transport & synthesis of various compounds
Cell Cycle - Answers Interphase
Cell Division (Miotic Phase)
