Evidence of Life
An unknown object is made of cells and uses energy. What claim is best supported?
It is living; cellular organization and energy use are strong evidence.
Which structure controls what enters and leaves both plant and animal cells?
Cell membrane.
What is the main job of mitochondria?
Release usable energy from nutrients.
Which systems work together to get oxygen to muscle cells?
Respiratory and cardiovascular.
What is a tissue?
A group of similar cells working together.
Why is growth alone not enough to prove something is living?
Nonliving things such as crystals can grow; multiple characteristics are needed.
Which structure gives a plant cell rigid support?
Cell wall.
What is the role of lysosomes?
Break down/recycle wastes and worn-out materials.
Which systems move nutrients from food to body cells?
Digestive and cardiovascular.
If muscle cells cannot release enough energy, trace the effect upward.
Cells → tissue → organ → system → organism can all function less effectively.
A cell moves toward light. Which characteristic of life is shown?
Response to stimuli.
Which structure captures light energy to help make glucose?
Chloroplast.
Why do plant cells need both chloroplasts and mitochondria?
Chloroplasts help make glucose; mitochondria release usable energy from nutrients.
Which system removes many dissolved wastes from blood?
Excretory/urinary.
What is an organ?
Different tissues working together for a function.
Name three pieces of evidence that strongly support that something is living.
Examples: cells, energy use, growth/development, response, reproduction, homeostasis.
Which structure controls many cell activities?
Nucleus.
Predict one effect if mitochondria stop working in a muscle cell.
Less usable energy; reduced muscle function.
How do nervous and muscular systems interact when you catch a ball?
Nervous system processes/sends signals; muscles contract.
Why is the stomach an organ rather than an organ system?
It is one structure made of tissues; a system contains multiple organs.
A crystal grows but does not use energy or contain cells. Living or nonliving? Defend.
Nonliving; growth alone is insufficient.
Name two structures found in plant cells but not animal cells in our model.
Cell wall and chloroplast.
Is it Correct: “Mitochondria make glucose and chloroplasts release usable energy.”?
yes ? WHY?
No? WHY?
is it Correct: “Mitochondria make glucose and chloroplasts release usable energy.”?
yes ? WHY?
No? WHY?
Why can no body system function completely alone?
Life processes require transport, exchange, signals, protection, and waste removal among systems.
Complete: muscle cell → ___ → heart → cardiovascular system → human.
Cardiac muscle tissue.