TEAS Science

study guide for the science portion

Circulatory System

Transports oxygen/nutrients to the Heart, blood and vessels

Respiratory

Gas exchange (Lungs, trachea, diaphragm)

Digestive

Breaks down food, absorbs nutrients (Mouth → intestines)

Nervous

Sends signals via neurons

Immune

Fights infections

What is Homeostasis?

The body’s ability to maintain balace despite the external changes

What is negative feedback?

Brings back to normal

What is positive feedback

Pushes further

What is the order of the heart flow?

Right Atrium → Right Ventricle → Lungs → Left Atrium → Left Ventricle → Body

What is a nucleus

DNA storage

What is the mitochondria?

Makes ATP

What are ribosomes?

Protein synthesis

What is the purpose of a golgi body

packages proteins

What are lysosomes?

Contains digestive enzymes to breakdown waste

What sugar does DNA contain

Deoxyribose

What are the bases of DNA

Adenine, Thymine, Cytosine, Guanine

What is the structure of DNA

Double stranded nucleotide

What is the function of DNA

Stores and transmits information

What sugar does RNA contain

Ribose

What are the bases of RNA

Adenine, Uracil, Cytosine, Guanine

What is the structure of a RNA

Single stranded with ribose sugar and phosphate backbone

What is the function of RNA

Builds proteins

What is the difference between Mitosis and Meiosis

Mitosis makes body cells, Meiosis makes sex cells

How many cells are made in mitosis

2 diploid cells

How many cells are made in meiosis

4 haploid sex cells

Mendel: What is a dominant allele

An allele that shows even in 1 copy is present

What is the difference between Homozygous and Heterozygous

Homo is same, Hetero is different

What is the Classification Order

Domain → Kingdom → Phylum → Class → Order → Family → Genus → Species

Explain Natural selection

Best traits help survival, and variations is key

Protons

Atomic number

Neutron

Atomic mass

Electrons

Protons in a neutral atom

What is an isotope

Same number of protons, different number of neutrons

Is rusting a chemical or physical change

Chemical, new substance

Is boiling water a chemical or physical change

Physical

What rnage of the pH scale is acidic

0-6

What range in the pH scale is basic

8-14

What state of matter has a fixed shape

A solid

What state of matter flows

Liquid

What state of matter fills the container

Gas

What speeds up diffusion

High temperature, smaller molecules

You have 0.5 moles in 2L. What’s the molarity

0.5/2 = 0.5 M —> M = moles / liters

What happens during photosynthesis

Chloroplasts

What happens in cellular respiration

mitochondria

What are the reactants for photosynthesis

CO₂ + H₂O + sunlight

What are the reactants for cellular respiration

O₂ + Glucose

What are the products of photosynthesis

Glucose + O₂

What are the products for cellular respiration

CO₂ + H₂O + ATP

What is the order of the Scientific Method

Ask a question, form a hypothesis, experiment, analyze data, draw conclusion

Independent variable

you change it

Dependent variable

you measure it

Control group

used for comparison

What is newton’s law

Objects stay at rest

What is the formula for speed

Distance / time

What is the formula for Acceleration

Change in speed/time

What is the formula for Force

Mass x Acceleration