Sophomore Bio Lab Exam 1

Biology

The study of life

Criteria to be a living organism

Have cells

Assimilation

how living organisms interpret their environment

reproduction

the production of offspring

Homeostasis

regulating an internal environment

evolution

adaptations occur over time

Adaptation

organisms change to better suit their enviornment

science

a way of knowing

Steps of the Scientific Method

Identify problem, Form Hypothesis, Collect Data, Analyze Data, Form Conclusions, Report

Observation

Information obtained through the senses.

question

A statement that requires an answer.

hypothesis

possible explanation for an event that can be tested

Experimentation

control group and experimental group

control group

stays the same

experimental group

changes

Conclusion

A summary based on evidence or facts

length

How long something is

Celsius freezing point

0

Celsius boiling point

100

Volume

length x width x height

standard measuring system in science

metric system

ruler

tool used to measure length

beaker

measures the volume of a liquid

meter stick

measures length (not ruler)

tape measure

length (not ruler or meter stick)

Erlenmeyer flask

measures volume

adhesion

An attraction between molecules of different substances

Cohesion

Attraction between molecules of the same substance

water makeup

H2O

single most important molecule

hydrogen

life beings in ____

water

Properties of water

cohesion, adhesion, excellent solvent, high surface tension, high heat capacity, varying density, high heat of vaporization

Why is water a polar molecule?

water has positive hydrogen atoms and negatively charged oxygen atoms

ice is less or more dense than water

less

high surface tension

hydrogen bonds hold water together tightly, so the waters surface acts like a membrane

heat of vaporization

The amount of energy required for the liquid at its boiling point to become a gas

water is one of the most ___

abundant resources on earth

Why is water the universal solvent?

It dissolves more substances than any other liquid

Carbohydrates monomers

monosaccharides (glucose, fructose, galactose)

protein monomers

amino acids

lipid monomers

glycerol and fatty acids

What does Benedict's Reagent test for?

simple sugars

What is a positive Benedict's Reagent result?

red/green

What is a negative Benedict's Reagent result?

no change/blue

iodine/lugol's reagent is for

starch

iodine/lugol's reagent positive

black/dark blue

iodine/lugol's reagent negative

reddish/brown

biuret reagent is for

amino acids and proteins

biuret reagent positive

purple/pink

biuret reagent negative

blue

monosacharides

fructose, glucose, galactose

how closely measures agree with a value

precision

Accuracy

A description of how close a measurement is to the true value of the quantity measured.

Carbohydrates are organic molecules that contain C, O, and H

True

simple carbohydrates

made up of monosaccharides

made up of many glucose molecules

Polysaccharide

starch is a ____

polymer for carbohydrates

amino acids connected by peptides are called ____

polypeptides

step 1

observation

step 2

question

step 3

hypothesis

step 4

experimentation

step 5

collect data

step 6

conclusion

step 7

create law/theory