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Biology Semester 1
Terms in this set (108)
What is not a characteristic of all living things?
Ability to move
What does cell specialization allow multicellular organisms to do?
Perform different functions
What characteristic of all living things explains why birds fly south for the winter?
Living things respond to their environment
The amount of light and temperatures are examples of what?
Factors to which things respond
What is the nucleus made up of?
Protons and neutrons
11 protons and 12 neutrons. What is the atomic number?
What is the most abundant compound?
What is a substance with a pH of 6 called?
What is the combined portions of earth in which organisms live called?
What is nitrogen fixation carried out by?
What are ponds and lakes?
What is not true about the open ocean?
It begins at the low tide mark and extends to the end of the continental shelf
What is the series of predictable changes in an ecosystem?
What factors can influence continental change?
-introduction of native species
-long term climate changes
What occurs during he ecological succession ?
Living organisms modify their environment little at a time
What is a niche?
The job or how the organism contributes to its ecosystem
What is predation?
An interaction in which one organism captures and feeds on another organism
What can influence the climate of a small area within a biome?
Natural features such as a lake
What are aquatic ecosystems classified by?
-depth and flow
What is exponential growth?
Phase in which the ecosystem grows quickly
What are density-dependent factors?
What is not likely to be effected by a density-dependent factor?
A small scattered population
Where has population growth slowed?
What are limiting factor examples?
What will reduce competition within a species' population?
What is a density-independent factor?
A disease result in lots of deaths in a population would be a what?
Density-dependent limiting factor
What is an endangered species?
A group of organisms in danger of extinction
What are some threats to biodiversity?
-Biological magnification of toxic compounds
What is one of the greatest threats to biodiversity in the world today?
What is major factor that negatively affects biodiversity?
What has become the most important source of environmental change on earth?
Why are fossil fuels non renewable?
They require hundreds of years to form
What is biodiversity important to humans?
-provides food and goods
What was DDT used for?
As DDT moves up in trophic levels, what happens to its concentration?
Amino acid is to protein as...
Simple suger is to starch
What is a monosaccharide?
What organic compound is the main source of energy for living things?
What is not a function of proteins?
Store and transmit heredity
What are amino acids made of?
What is the main function of the cell wall?
Support and protect the cell
Unlike the membrane, the cell wall is...
Usually made of toug fibers
Where will you not find a cell wall?
What do eukaryotes contain?
Why is he nucleus important to cells?
It contains coded instructions for making proteins
What is diffusion?
Movement of molecules from high to low concentration
What organelle breaks down food into molecules that the cell can use?
What organelle converts the energy stores in food into compounds that are more convenient?
What is not a function of the cytoskeleton?
Prevents chromosomes from splitting
What structure is found in the cytoplasm?
What organelle makes proteins?
What is the function of the cell membrane?
Regulates what comes in and out
Why does diffusion occur?
Molecules constantly move and collide with each other
What organelles helps provide cells with energy?
Mitochondria and chloroplasts
What organelle would you find in plants but not animals?
What does the rate at which wastes are produced by cells dependent upon?
What goes with G Phase?
Preparation for mitosis
During which phases are the chromosomes visible?
Prophase and metaphase
What is the structure in the middle of the chromosome?
What are the long parts of the chromosomes?
What is cancer?
Disorder in which some cells have lost the ability to control their growth rate
What are tumors?
Masses of cells
What does cancer effect?
What is a cell with a p53 gene likely to do?
What is the cell theory?
-All living things are made of cells
-all cells come from preexisting cells
-cells are the basic units of life
What is active transport?
Requires input of energy into the cell
What is osmosis?
Diffusion of water across a selectively permeable membrane
What are the levels of organization?
What is cell division?
The process by which a cell divides into 2 daughter cells
When during the cell cycle is the DNA replicated?
What are the phases of mitosis in order?
Prophase metaphase anaphase telophase
What is one difference between division of plants and animals?
A cell plate
What happens when the cells come in contact with other cells?
They stop growing
Cycling are a family of closely related proteins that what?
Regulate the cell cycle
Based on prior knowledge
The study of life
Characteristics of life
-made up of cells
-universal genetic code
-growth and development
-obtain and use energy
-respond to stimuli
Study of interactions
Capture energy from sources other than sunlight
What are the 3 ecological pyramids?
Energy biomass and numbers
Recycling in the biosphere
Law of conservationist of mass
Mass cannot be created nor destroyed
Nutrient that is scarce
Completely natural process that keeps the temp stable
Happens where there was no soil before
Occurs where a disturbance has already occurred
Resources become less available
Density Independent Factor
Affect all populations regardless of their size
Density Dependent Factors
Occurs when a population reaches a certain size
Bonds between the monomers in a polymer are broken
Breaking bonds and releasing energy
Who is hooke?
Viewed a cork under a microscope and came up with the word cell
Who was Leeuwenhoek?
Viewed organisms under a microscope
Who was schleiden?
Stated that all plants are made of cells
Who was Schwann?
Said that all animals are made of cells
Who was Virchow?
Said that all cells come from preexisting cells
Scanning electron microscope
Creates a 3D image
Allows light to pass through the organism
Brain of the cell & contains DNA
Jelly-like substance in between the organelles
Where the ribosomes are made
Small particles of RNA and proteins
Has no ribosomes
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