Science TAKS Review Viruses and Bacteria Viruses are

Science TAKS Review

Viruses and Bacteria • Viruses are not alive, Bacteria are alive

Viruses (not alive) • Viruses – cause disease – ANTIBIOTICS DO NOT CURE THEM – ONLY IMMUNE SYSTEM • AIDS, the common cold, small pox, influenza, and warts

Bacteria (alive) • Harmful - get antibiotics – Strep Throat – Staph Infections • Helpful – decomposers – septic tanks, rotting meat – mutualism : intestines – cheese, yogurt

Evolution • Mutations • Reproductions Natural Selection- environment decides who lives… only tall trees- giraffes happy

Who would survive?

Symbiosis • Symbiosis – relationship between two organisms • Mutualism – both species benefit

• Predation – one species (predator) benefits, other (prey) is eaten

• Parasitism – one species benefits, the other is harmed

• Competition – two species want same thing

• Commensalism – one species benefits, one is not affected • Remora fish eat shark’s scraps; shark is not affected

Food chain & food web – who eats what Arrows show flow of energy

Trophic levels • Producer - green plant - photosynthesis • Consumer – Must eat • Decomposer breaks down dead and waste

Types of matter Elements Fe H O Au Compounds Fe. Cl 3 H 2 O CO 2

Density D = M V More dense liquids sink! Water density = 1 g/ml

Viscosity Resistance to flow more viscous– the slower the flow

Buoyancy

Chemical Change • • Change of temperature Production of light Production of a gas New thing formed

Physical change • Change in size and shape • Making a solution • Change in state

Conservation of Mass 6 CO 2 + 6 H 20 --> C 6 H 12 O 6 +6 O 2 Matter is never created or destroyed

Solutions • Solute- salt • Solvent – water • Soluble- salt can be dissolved

• Force - a push or a pull on an object F = ma Force is measured in NEWTONS (N)

• Work - force causes an object to move W=Fd Work -JOULES (J)

• Power – How fast you get work done • P=W/t • Power - WATTS (W)

Kinetic Energy - motion Potential Energy - energy stored Click on the slide!

Energy • Conduction - heat transfer from one object to another by direct contact …solids

• Convection - heat carried from one place to another in a liquid or gas as molecules move in currents caused by density differences…liquids & gases

• Radiation - the transfer of heat energy through empty space • (heat from sun)…. infrared

Soooooo……. . Heat moves by-

Waves • Transverse wave moves up and down as the energy travels right to left. Perpendicular • example: light, ocean • Longitudinal wave – moves back and forth as the energy travels right to left. Parallel • Example: sound

REFLECTION

Refraction

Electricity- 10 th • Series Circuit - a circuit in which the current has only one path • Parallel Circuit - a circuit in which the current can take more than one path

READ!!!

Remember • Use your Equation Sheet • Use your Calculator • Use your Periodic Table • YOU need at least 41 correct to pass…. . DO YOU HAVE THAT?