Life Flashcards
How much of a jellyfish is made of water?
90 %
What do scientists look for on Mars to reveal life?
Water.
What are the characteristics of life?
Metabolism Reproduction Growth Irritability Motion
How much of a plant is made of water?
75 %
What is Nutrition?
Nutrition is how an organism obtains food.
What is the first part of metabolism?
Nutrition
What is Biology?
Biology is the study of life.
What is the first characteristic of life?
Metabolism
What is the second part of metabolism?
Digestion
What is digestion?
Your body breaking down food to the size of molecules.
What are the parts of metabolism?
Nutrition
Digestion
Respiration
Synthesis
How long does digestion take if you eat a meal?
4-5 hours.
What is the final destination of the food you eat?
Every living cell in your body.
What happens to the cells if they don’t get nutrition?
The cells will die.
What is the third part of metabolism?
Respiration.
What is respiration?
Respiration is the changing of food (carbs) into energy.
What does energy do?
Energy drives chemical reactions in your body.
What is the fourth step of metabolism?
Synthesis.
What is synthesis?
Synthesis is the use of the rest of your food and energy to create bigger structures.
What is the second characteristic of life?
Reproduction.
What is reproduction?
Reproduction is an organism’s ability to duplicate.
What are the two types of reproduction?
The types of reproduction are asexual and sexual reproduction.
What is asexual reproduction?
Reproduction by one parent.
How do the children of asexual reproduction look compared to their parents?
They look exactly the same. They are clones.
What is sexual reproduction?
Reproduction by two parents.
What percent of their parents is a child of sexual reprodcution?
50% one parent, and 50% the other.
Which type of reproduction is better?
It depends on the circumstance.
Sexual reproduction is better for changing environments.
Asexual reproduction is better for non-changing environments.
What is the third characteristic of life?
Growth.
What is growth?
Growth is an increase in size due to synthesis reactions.
What is the fourth characteristic of life?
Irritability.
What is irritability?
Irritability is the ability to react to environmental changes.
What is the fifth characteristic of life?
Motion.
What is motion?
Motion is the ability to move under your own power.
What are the two major types of getting nutrition?
Autotrophism and Heterotrophism.
What are autotrophs?
Autotrophs are organisms that make their own food.
What are heterotrophs?
Heterotrophs are organisms that eat other organisms.
What are the two ways of autotrophism?
Chemosynthesis and Photosynthesis.
What is chemosynthesis?
Chemosynthesis is using chemical energy to make food.
What is photosynthesis?
Photosynthesis is using light energy to make food.
What are the different types of heterotrophs?
Parasites, Saprotrophs, and Holotrophs.
What is a parasite?
Parasites are organisms that steal food from a host.
Do parasites have a digestive system?
Parasites do not have a digestive system.
Which part of metabolism do parasites skip?
Parasites skip digestion.
Is chemosynthesis common?
Chemosynthesis is very rare.
What organism is an example of an organism that uses chemosynthesis?
Sulfer Bacteria.
What organism is an example of an organism that uses photosynthesis?
An oak tree.
What is a saprotroph?
Saprotrophs are organisms that feed off of other dead organisms without using a mouth.
Does a saprotroph go through internal or external digestion?
A saprotroph goes through external digestion.
What are two examples of saprotrophs?
Fungi and most bacteria.
Which type of heterotroph causes decay?
Saprotrophs cause decay.
What is a holotroph?
Holotrophs are organisms that ingest whole cells using a mouth.
Does a holotroph go through internal or external digestion?
A holotroph goes through internal digestion.
What is an example of a holotroph?
Human beings.
What is an example of a parasite?
Tape worms
