BIOCHEM LAB EXAM 1 questions and answers
2025\2026 A+ Grade
Always place a ____ in front of a decimal point
- correct answer 0
Always __________ your equation's units
- correct answer Balance (make sure they are equal on both side)
Amount
- correct answer A *single unit* that describes a number, mass/weight, or volume
Concentration
- correct answer A *ratio* that describes an amount per total volume
Molarity (M)
- correct answer M = moles per 1L
mM = mmoles per 1L
Commonly used when making a solution from a dry chemical stock
Percent weight per volume (%w/v)
- correct answer grams per 100 ml
Used when the pure solute can commonly be found as a solid
, Weight per volume (w/v)
- correct answer Units of both solute & solvent are included (ex. 15mg/ml)
Percent volume per volume (%v/v)
- correct answer ml per 100 ml
Used when the pure solute is commonly found as a liquid
Volume per volume (v/v)
- correct answer Refer to as "parts" (ex. 1 part NaCl, 18 parts water)
Commonly see in older cell biology literature/protocals
*volumes not given*
X
- correct answer *Unitless*
Comparison of stock solution vs. working solution
*C1V1 = C2V2*
Commonly used when making a solution from a liquid chemical stock
Serial Dilution
- correct answer All solutions in the series are diluted by the *same factor*
Independent Dilution Series
- correct answer *Different* dilution factors are used within the series
Multi-component Dilutions
- correct answer Must consider each component individually
2025\2026 A+ Grade
Always place a ____ in front of a decimal point
- correct answer 0
Always __________ your equation's units
- correct answer Balance (make sure they are equal on both side)
Amount
- correct answer A *single unit* that describes a number, mass/weight, or volume
Concentration
- correct answer A *ratio* that describes an amount per total volume
Molarity (M)
- correct answer M = moles per 1L
mM = mmoles per 1L
Commonly used when making a solution from a dry chemical stock
Percent weight per volume (%w/v)
- correct answer grams per 100 ml
Used when the pure solute can commonly be found as a solid
, Weight per volume (w/v)
- correct answer Units of both solute & solvent are included (ex. 15mg/ml)
Percent volume per volume (%v/v)
- correct answer ml per 100 ml
Used when the pure solute is commonly found as a liquid
Volume per volume (v/v)
- correct answer Refer to as "parts" (ex. 1 part NaCl, 18 parts water)
Commonly see in older cell biology literature/protocals
*volumes not given*
X
- correct answer *Unitless*
Comparison of stock solution vs. working solution
*C1V1 = C2V2*
Commonly used when making a solution from a liquid chemical stock
Serial Dilution
- correct answer All solutions in the series are diluted by the *same factor*
Independent Dilution Series
- correct answer *Different* dilution factors are used within the series
Multi-component Dilutions
- correct answer Must consider each component individually
