BIO 141 EXAM 1 QUESTIONS AND
ANSWERS
homeostasis - Correct Answers -body's ability to maintain a constant environment
negative feedback loop - Correct Answers -body senses change and reacts to negate or
reverse the condition, like a thermostat
positive feedback loop - Correct Answers -Self-amplifying cycle in which an INITIAL
change leads to a greater change and is used to cause rapid change in the body, like
childbirth
hierarchy of organization - Correct Answers -The body is organized into interacting
organ systems. Organ systems start with molecules that make up cells that make up
tissues that make up organs.
gene expression - Correct Answers -Nucleotides are arranged into genes in our
genome
Transcription = Make a working copy of the gene (RNA)
Translation = Translate the nucleotides to amino acids
This process is regulated to produce necessary proteins for physiological processes like
maintaining homeostasis
translation - Correct Answers -Translate the nucleotides to amino acids, occurs with
ribosomes in/on E.R.
carrier-mediated transport - Correct Answers -Facilitated diffusion
-Carrier proteins move solutes down concentration gradient
-Solute must bind carrier protein
-Change of protein shape moves solute across membrane
osmosis - Correct Answers -Diffusion of water across a membrane - diffuses from
where ITS concentration is HIGH (dilute solute) to where ITS concentration is low
(concentrated solute)
diffusion - Correct Answers -Spontaneous movement of particles from high to low
concentration
Depends on CONCENTRATION GRADIENT
Particles move down the concentration gradient (from high to low)
ANSWERS
homeostasis - Correct Answers -body's ability to maintain a constant environment
negative feedback loop - Correct Answers -body senses change and reacts to negate or
reverse the condition, like a thermostat
positive feedback loop - Correct Answers -Self-amplifying cycle in which an INITIAL
change leads to a greater change and is used to cause rapid change in the body, like
childbirth
hierarchy of organization - Correct Answers -The body is organized into interacting
organ systems. Organ systems start with molecules that make up cells that make up
tissues that make up organs.
gene expression - Correct Answers -Nucleotides are arranged into genes in our
genome
Transcription = Make a working copy of the gene (RNA)
Translation = Translate the nucleotides to amino acids
This process is regulated to produce necessary proteins for physiological processes like
maintaining homeostasis
translation - Correct Answers -Translate the nucleotides to amino acids, occurs with
ribosomes in/on E.R.
carrier-mediated transport - Correct Answers -Facilitated diffusion
-Carrier proteins move solutes down concentration gradient
-Solute must bind carrier protein
-Change of protein shape moves solute across membrane
osmosis - Correct Answers -Diffusion of water across a membrane - diffuses from
where ITS concentration is HIGH (dilute solute) to where ITS concentration is low
(concentrated solute)
diffusion - Correct Answers -Spontaneous movement of particles from high to low
concentration
Depends on CONCENTRATION GRADIENT
Particles move down the concentration gradient (from high to low)
