what are living things

Question 1

cell theory, living cells can exist only where;

Answer 1

• an energy source is available that can be trapped and utilised by an organism for metabolic processes that maintain it’s living state
• liquid water is available to allow biochemical reactions to occur, and to dissolve chemicals and transport them both within cells and to and from cells.
• the chemical building blocks required for life is available for use by an organism in repar, growth and reproduction. these chemical building blocks include carbon, oxygen, nitrogen and hydrogen, and each is able to form chemical bondswith other elements. carbon in particular is the most versatile chemical.
• stable envirnomental conditions exist within the range of tolerance of an organism, such as pressure, tempurature, light intensity, ph and salinity.

Question 2

what does MRS. GREND stands for;

Answer 2

• M - Movement
• R - Respiration
• S - Sensitivity to stimuli
• G - Growth
• R - Reproduction
• E - Excretion of wastes
• N - Nutrition
• D - DNA

Question 2

MRS GREND - Movement

Answer 2

movement ; have some level of self powered movement

Question 3

MRS GREND - respiration

Answer 3

the conversion of carbohydrates to a usable energy form (ATP)

Question 4

MRS GREND - sensitivity to stimuli

Answer 4

the response of an organism to it’s envirnoment (e.g. plants responding to light, animals responding to external tempuratures by sweating , shivering)

Question 5

MRS GREND - growth

Answer 5

an irreversible change in mass

Question 6

MRS GREND - reproduction

Answer 6

production of offspring, passing attributes from one generation to the next

Question 7

MRS GREND - excretion of wastes

Answer 7

produce wastes, such as dead cells or urine, that need to be removed

Question 8

MRS GREND - nutrition

Answer 8

intake of food or nutrients

Question 9

MRS GREND - DNA

Answer 9

the molecule that codes for the production of proteins

Question 10

what happens when the conditiosn for living organisms are met

Answer 10

where these conditions are met, living organisms can use energy to perform the complex set of chemicals transformations (metabolic activities) within their cells that sustains their living state.

Question 11

what are the 3 tenets of cell theory

Answer 11

• all organisms are composed of cells
• the cell is the basic unit of structure and organisation in organisms
• all cells come from pre-existing cells.