Introduction to Human Biology- Exam
1 questions and verified answers.
Buffers ANS - Buffers are substances that help obtain the PH change: 0-14 (7 is neutral) (above 7 is
acidic)
Free radicals ANS - Free radicals have unpaired electrons (negative)
Isotopes ANS - Isotopes have a different number of neutrons: Giving off radiation
Polar Covalent Bonds ANS - A covalent bond between atoms that differ in electronegativity. The shared
electrons are pulled closer to the more electronegative atom, making it slightly negative and the other
atom slightly positive.
What is not a characteristic of water ANS - Non Polar: Water is polar
What is a saturated fatty acid? ANS - Single Bonds
ionic bonds ANS - Occurs between oppositely charged ions
Positively charged ion ANS - forms if an atom or molecule loses electrons
Negatively charged ions ANS - forms if an atom or molecule gains electrons
Solvent ANS - the substance in which the solute dissolves
Hydrophilic ANS - Attracted to water
Hydrophobic ANS - not attracted to water
, Is water liquid at body temp? ANS - Yes
What percentage of body weight is water? ANS - 60%
Acid ANS - Any molecule that can donate hydrogen ions to a solution
Base ANS - Increasing hydrogen ions concentration in solutions
PH Scale ANS - Measure of hydrogen ion concentration
Dehydration synthesis ANS - Condensation reaction where molecules are connected by loss of a water
molecule. Building bigger molecules
Hydrolysis ANS - Breaking down complex molecules by the chemical addition of water
Is dehydration synthesis the reverse of hydrolysis? ANS - Yes
Triglycerides ANS - energy storage molecules
Phospholipids ANS - cell membrane structure
Steroids ANS - Made of four rings of carbon.
Unsaturated ANS - double bonds
Living things grouped into 3 domains ANS - 1. Domain Bacteria
2. Domain Archaea
3. Domain Eukarya
1 questions and verified answers.
Buffers ANS - Buffers are substances that help obtain the PH change: 0-14 (7 is neutral) (above 7 is
acidic)
Free radicals ANS - Free radicals have unpaired electrons (negative)
Isotopes ANS - Isotopes have a different number of neutrons: Giving off radiation
Polar Covalent Bonds ANS - A covalent bond between atoms that differ in electronegativity. The shared
electrons are pulled closer to the more electronegative atom, making it slightly negative and the other
atom slightly positive.
What is not a characteristic of water ANS - Non Polar: Water is polar
What is a saturated fatty acid? ANS - Single Bonds
ionic bonds ANS - Occurs between oppositely charged ions
Positively charged ion ANS - forms if an atom or molecule loses electrons
Negatively charged ions ANS - forms if an atom or molecule gains electrons
Solvent ANS - the substance in which the solute dissolves
Hydrophilic ANS - Attracted to water
Hydrophobic ANS - not attracted to water
, Is water liquid at body temp? ANS - Yes
What percentage of body weight is water? ANS - 60%
Acid ANS - Any molecule that can donate hydrogen ions to a solution
Base ANS - Increasing hydrogen ions concentration in solutions
PH Scale ANS - Measure of hydrogen ion concentration
Dehydration synthesis ANS - Condensation reaction where molecules are connected by loss of a water
molecule. Building bigger molecules
Hydrolysis ANS - Breaking down complex molecules by the chemical addition of water
Is dehydration synthesis the reverse of hydrolysis? ANS - Yes
Triglycerides ANS - energy storage molecules
Phospholipids ANS - cell membrane structure
Steroids ANS - Made of four rings of carbon.
Unsaturated ANS - double bonds
Living things grouped into 3 domains ANS - 1. Domain Bacteria
2. Domain Archaea
3. Domain Eukarya
