GACS lclab Biology - Spring Final - Townsend

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GACS lclab Biology - Spring Final - Townsend

organic compounds

carbon/compounds in living things

pH scale

measure of how acidic or basic a solution is; scale ranges from 0-14; 7 is neutral; above 7 = basic, below 7 = acidic

chemical reactions

bonds between atoms are formed or broken, causing substances to combine and recombine as different molecules

metabolism

chemical reactions that occur within an organism

chemical formula

a notation used by chemists to express technical facts in chemistry

atom

the smallest particle of an element that has the characteristics of the element

nucleus

center of an atom; made of protons and neutrons

protons

postiviely charged particles

neutrons

particles that have no charge

electrons

negatively charged particles that form a cloud around the nucleus

amino acids

building blocks of protein molecules

water

requires more heat to increase its temperature than other sustances because it resists changes in temperature

water

one of the few substances that expands when it freezes

isotopes

atoms of the same element that have different numbers of neutrons in the nucleus

diffusion

net, random movement of particles from an area of higher concentration to an area of lower concentration, eventually resulting in even distribution

concentration, temperature and pressure

key factors that effect the rate of diffusion

temperature, pressure

an increase in these can speed up the process of diffusion

dynamic equilibrium

continuous movement but no overall concentration change

organic compounds

a carbon compound that comes from living things

pH scale

a scale ( with numbers 0 -14) that messures how acidic or basic a soloution is

chemical reactions

when these occur bonds between atoms are formed or borken; happens when substances combine and recombine and make new substances

chemical formula

the formula of a chemical substance

structure of an atom

all atoms have the same general arrangement; the center is called the nucleus and this is made up of protrons and nuetrons

building blocks of protiens

amino acids

important proprties of water

its polar, it can resist change in tempature, it expnads when it freezes

isotopes

atoms of the same element that have different numbers of neutrons

What is the energy level of electrons?

positive

diffusion

the movement of particles from an area of higher concetration to an area of lower concetration

osmosis

diffusion of water across a selectivly permeable memebrane depending on the concetration of solutes on either side of the membrane

microscopes

1. compound light microscopes- this type of microscope uses a series of lenses to magnify objects in steps; can magnify things up to 1500 times. 2. electrom microscope- uses a beam of electrons to magnify structures up to 500,000 times

prokaryote

unicelluar organsims composed of prokaryotic cells; which have no nucles

eukaryote

multicelluar organsim; they have a nucleus

manin ideas of cell theory

1. All orgnasims are composed of 1 or more cells. 2. The cell is the basic unit of orgnization or organsisms. 3. All cells come from prexsisting cells.

plasma membrane

the boundary between the cell and its enviroment, to allow a steady supply of these nutrients to come into the cell no matter the external conditions

cell wall

firm and rigid protective structure located outside the plasma membrane

plant cells V.S. animal cells

plant cells have: a cell wall, animals cells dont.
plant cells have cell wall and membrane while a animal cell only has a cell memebrane
plant cells have chloplast animal cells dont
Animal cells are round & plant cells are rectangluar

nucleus

organelle that manages all cell functions

isotonic

a soloution; in this the concentration of disoloved substances in the soloution is the same as the concentation of disoloved substances in the cell

hypotonic soloution

soloution in which the concentration of disolved substances is lower in the solution outside of the cell than the concetration inside the cell

hypertonic soloution

soloution when the concetration of disolved substances outside the cell is higher than the concetration inside the cell

passive transport

the movement of particles across a memebrane by duffision

active transport

movement of matereals through a memebrane aginst the concentration gradient

cell cycle

sequence of growth and division within a cell. 1.) G1 2.) s Stage 3.) G2 4.) mitosis

interphase

majority of cells life spent in this stage; durring this a cell grows in size and chrosomes are duplicated to prepare for division

mitosis

process by which 2 daughter cells are formed and each contain a complete set of chrosomes

prophase

phase of mitiosis when the chromitin coils up into visible chrosomes

metaphase

phase of mitosis when the chrosomes move to the equator of the spendle

anapahse

phase of mitosis when the centromeres split and the sister chromitids are pulled to the oppsite poles of the cell

telophase

phase of mitosis when two distinct daughter cells are formed

ATP

energy molecule; composed of an adenosine molecule with 3 phosphate groups attached

photosynthesis

6 CO2 + 6 H2O → C6H12O6 + 6 O2

chlorphyll

the most commont pigiment in chlorplast

light- dependent reaction

reaction that converts light energy into chemical energy

light- independent reaction

energy from light-dependent reactions is used to produce glucose and additional ATP molecules

respiration

the process by which mitochondria beak down food molecules to produce ATP (energy)

energy

your body needs this to move things throughout your body; an example of this is that your body needs this to move molecules in your kidney

homeostasis

orgnasims regluation of internal body tempture

calvin cycle

series of reactions that use carbon dioxcide to make carbohydrates

Mendel's Law of Segeration

explaning that because each plant has 2 different allels, it can produce 2 different types of gametes. Durring fertlization male & female gametes randomly pair to produce 4 combonations of alleles

meiosis

type of cell division where one body cell produces 4 gametes; each contain half the number of chrosomes as the parent body cell

fertlization

fusion of male and female gametes

crossing over

extchange of genetic materiales between nonsister chromatids from homologous chrosomes durring prophase 1 of meosis; resluts in new allel combonation

zygote

the resluting cell when a sperm cell fertlizes and egg

genes

segement of DNA that contols the protien production and the cell cycle

7

What would be nutral on the pH scale?

because the random movement of particles; which is called the Browinan motion

What causes diffusion ?

protrons and neutrons

What two things does the nucleus of an atom contain?

because its polar

Why is water able to dissolve many ionic and molecular compoumds ?

concetration gradient

Diffusion continues until there is no ________ _______.

because they do not have a nucleus

Why is bacteria classfied as a prokaryote?

1. increces surface area 2. forms internal compartments 3.makes cell processes more efficent

How are folded membranes an adavntage to a cell?

fluid mosiac

Because the phospholipid molecules and some protiens are free to move the plasma membrane is said to be a _______________.

electron microsocpes can magnify up to 500,000 times; & they can see structures inside cells with electron microsocpes

What is one advantage of electron micoscopes over light microsocpes ?

selective permiabality

A cells contents would be the same as its surroundings, were it not for its ___________ _____________.

hypertonic

Water moves into a cell placed in a ________ solution.

hypotonic

Water moves out of a cell placed in a ________ solution.

volume ; surface area

As a cell grows its ______ increces more than its ______ _________.

the plasma membrane

What is the structure most responsible for mantaning homeostasis within a cell?

metaphase

Durring which phase of mitosis do the chromosomes line up in the middle of the cell?

interphase

What is the longest phase of the cell cycle?

a centromere

What is a chromatid attached to the spindle fiber by?

prophase

In which phase of mitosis do the sister chromatids seprate?

chlorphyll

What is the main energy-trapping molecule in plants?

phosphate & adenosine

Energy is released from ATP when the bond is broken between _________ & __________.

oxygen

In respiration, what is the final electron acceptor in the electron transport chain?

photosynthesis

What is one way that organisms get energy from food without using oxygen?

carbon dioxcide and water

What are the waste products of respiration?

dominant ?

How would you discribe an organism that has the genotype Tt?

heredity

What is the passing on of traits from parents to offspring?

egg

What is the gamete called that only comes from the mother?

haploid

Would a female gamete (egg) be haploid or diploid?

by its physical traits

How can a dogs phenotype be determined?

allels

What are alternate forms of a gene called?

the transfer of male pollen grains to the pistil of the flower

What is pollination?

nitrogen bases

What is the key feature in DNA that allows it to be copied?

transcrption

In what process is messenger RNA formed ?

nueclotides

An RNA molecule is a polymer composed of subunits known as ________.

DNA replication

What is the process in which DNA is copied?

A) burning paper

Which of these is a chemical reaction A) burning paper B) picking up iron filllings with a magnet C) Mixing Sugar & water?

amino acids

What are the basic bulding blocks of protiens ?

protiens

What type of substance are the enzymes in our bodies?

isotopes

Carbon12, Carbon13, & Carbon14 are what?

animals

Which of the following orgnisims do not have cell walls; a) animals b) bacteria c) fungi d) plants

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