SCIENCE EXAM STUDY

Question 1

what organelles are not found in animal cell

Answer 1

chloroplast, vacuole

Question 2

why is cell reproduction important in celled-organisms

Answer 2

• maitain growth, repair
• cytokensis; cells seperate

Question 3

what are the events that take place before phrophase

Answer 3

• G1 –> cell growth
• S –> synthesis, DNA copied
• G2 –> DNA condences into cromosomes, centrioles & spindle fibres formed

Question 4

behavour of cancer cells

Answer 4

• rapid growth
• harms other organs when too big
• consume nutrience
• spreads

Question 5

what is the purpose of gas exchange

Answer 5

• supply oxygen to cells
• remove carbon dioxide

Question 6

what are the components of gas exchange system in an animal

Answer 6

any system that deliver gas to/ from blood stream
–> diaphram
–> gills in fish

Question 7

why are there tubes and vessels important in a circulatory system

Answer 7

• give/ exchange blood
• collect waste products
• help maintain blood pressure

Question 8

what does the circulatory system transport

Answer 8

blood, oxygen, nutrience

Question 9

draw phases of mitosis

Answer 9

1. prophase –> chromosomes in dissolving nucleus, chromatin moving to opposite sides
2. metaphase –> chromosomes line up in the middle of the cell, spindle fibres attatched
3. anaphase –> chromosomes get pulled by spindle fibres
4. telophase –> new cell starts to form, new chromasomes in new nuclous

Question 10

how is the electron arrangement of an ion the same as its nearest noble gas

Answer 10

both gain/ lose electrons to create a stable valence shell

Question 11

in reaction with non metals, metals tend to do what

Answer 11

lose electrons

Question 12

is copper (I) chloride & copper (II) chloride an ionic compound

Answer 12

yes, transfer electrons

origionaly copper is covalent but with the non-metal, becomes ionic

Question 13

why do molecular compounds have covalent bonds

Answer 13

they share electrons (molecular)

Question 14

what is a chemical change

Answer 14

when a new substance occurs

Question 15

what is a physical change

Answer 15

changes the look of the substance without changing the acutal substance

Question 16

what does a balanced chemical equation indidcate in terms of the condervation of mass

Answer 16

its a chemical reaction

Question 17

mass of gass equation

Answer 17

MOG = mass mixture - (mass of sol’ A + mass of sol’ B)

Question 18

in chemical equations, what does the coefficient and the subscripts mean

Answer 18

coefficient –> the # of the molecule
subscript –> the # of the single atom

Question 19

name all the general formulas

Answer 19

synthesis: A+B–>AB
combustion: A+O–>AO
decomposition: AB–>A+B
single displacement: A+BC–>AC+B
double displacement: AB+CD–>AD+BC
neturalization (double displacement): product always has salt+water

Question 20

what is the difference between embrotic stem cells and tissue stem cells

Answer 20

embryonic –> can form into any type of cell (comes from embryoeds
tissue –> can form into some type of cells

Question 21

what is the link inbetween the circulatory system and the respiratory system

Answer 21

• the circulatory system transports oxygen from the respritory to body tissues/ organs
• carries carbon dioxide back to the lungs for exhalation

Question 22

what is the link between the circulatory system & the digestive system

Answer 22

• the food creates nutrients in the intestines
• blood absorbs nutrients which gets moved to the rest of the body

Question 23

what do the symbols mean (S) (G) (AQ) (L)

Answer 23

S –> solid
G –> gas
L –> liquid
AQ –> aqueous

Question 24

what is the difference between an incandescent light bulb emitting light and a laser emitting light

Answer 24

• incadesent lights –> create a big scattered light with many different light rays
• lasers –> create one light ray going in one direction