Systems & Organization
What is a system in science?
A collection of parts that work together as a connected whole.
What does the “N” in MRS GREN stand for?
Nutrition
What is the main job of carbohydrates?
Provide energy
Which test is used to detect starch?
Iodine test
What does ATP stand for in respiration?
Energy used by cells (energy currency)
Which level of organization comes right after a cell?
Tissue
Which MRS GREN process provides energy for living things?
Respiration
Which nutrient helps muscles grow and repair?
Protein
What color shows protein is present in the Biuret test?
Purple
In respiration, glucose and oxygen make what two waste products?
Carbon dioxide and water
Put these in order from smallest to biggest: organ, cell, system, tissue
Cell → tissue → organ → system
Which of these is NOT part of MRS GREN: movement, respiration, photosynthesis, growth?
Photosynthesis
Which stage of digestion is when nutrients enter the blood?
Absorption
If iodine turns black, what nutrient is present?
Starch
In calorimetry, what is the independent variable?
Type of food burned
Why is the digestive system an example of a system?
Different organs work together to digest food.
Why is respiration important for living things?
It releases energy needed for life.
What is an example of chemical digestion?
Enzymes breaking starch into sugar
Which test is used to find simple sugars?
Benedict’s test
Water starts at 22°C and ends at 38°C. What is the temperature change?
16°C
Name one system in the human body and explain its job.
Example: Digestive system – breaks down food into nutrients.
A robot can move but is not alive. Which MRS GREN process is missing?
Respiration (also others acceptable if explained)
Which organ does most chemical digestion, and why?
Small intestine – it has enzymes and absorbs nutrients.
A food turns black with iodine and purple with Biuret. What nutrients does it contain?
Starch and protein
Why must the same volume of water be used in all calorimetry trials?
To control variables and make the test fair.