life on earth

Question 1

all life is ___ based

Answer 1

carbon

Question 2

most common elements in living entities

Answer 2

C,O,H,N,P,S

Question 3

how was carbon formed

Answer 3

in the stars from collision of 3 Helium atoms

Question 4

robert hooke

Answer 4

termed the word cell
British naturalist and scientist

Question 5

original old cell theory

Answer 5

1) cell is unit of structure
2) is a distinct entity and a building block in construction or organisms
3) cells form by free cell formation, (spontaneous generation) NO

Question 6

modern cell theory (6 points)

Answer 6

1) all known living things made up of cells
2) the cell is structural and functional unit of all living things
3) all cells only arise from pre-existing cells
4) cell contain heredity info passed from cell to cell during division
5) all cells basically same in chemical composition
6) all energy flow (metabolism and biochem) of life occurs within cells

Question 7

3 main categories of life

Answer 7

prokaryota-archaea
prokaryota-eubacteria
eukaryota

Question 8

life involves

Answer 8

metabolism, heredity and life happens in cells

Question 9

karyon=___ pro=___ eu=___

Answer 9

nut, before, true

Question 10

viruses

Answer 10

infectious particles consisting of nucleic acid in protein/ lipid/ carbohydrate coat

Question 11

viroids

Answer 11

infectious molecules of RNA that cause plant diseases (also in animals)

Question 12

obelisks

Answer 12

RNA virus like entities in bacteria in human GIT

Question 13

prions

Answer 13

transmissible abnormal form of normally-occurring protein

Question 14

biogenesis theory

Answer 14

life arose from pre-existing life, basis seen in abundance of organic molecules in space

Question 15

abiogenesis theory

Answer 15

life arose from non life on earth
earth is the source of all earth bound life

Question 16

first life; when, what and where

Answer 16

around 3.8-4 bya, simple prokaryotic cell, shallow water or deep sea vents or clay or ice or moist sediments

Question 17

how old is earth

Answer 17

approx. 4.6 bya

Question 18

autotrophic organisms;

Answer 18

convert light energy into chemical energy to make biomass

Question 19

heterotrophic organisms

Answer 19

use food molecules, ultimately generated by autotrophs, to make energy and biomass

Question 20

information carriers for life

Answer 20

DNA and RNA

Question 21

anabolism

Answer 21

building of complex molecules from numerous simple ones

Question 22

catabolism

Answer 22

break down of complex molecules into simple ones

Question 23

list the unity of life factors (things that all life has)

Answer 23

• all life is cellular
• life requires input of energy (autotrophic or heterotrophic)
• life has self sustaining chemical reactions (metabolism)
• living things reproduce themselves
• info carriers for life are DNA and RNA
• life evolves (adapts); life is a continuum from first to modern forms