Chapter 1 Flashcards
What study reveals common themes?
the study of life
What core theme accounts for unity and diversity of life
evolution
In studying nature, scientists form and test __________.
hypotheses
The process of Evolution drives the ________ and _________________ of life
unity; diversity
Biological systems utilize _____________ and ____________________ to grow, to reproduce, and to maintain dynamic homeostasis.
free energy; molecular building blocks
Living systems store, retrieve, transmit, and _________ to information essential to life processes.
respond
Biological systems ___________, and these systems and their interactions possess complex processes.
interact
What is an organisms’ adaptations to its environment a result of?
evolution
What is evolution?
the process of change over time that has resulted in the astounding array of organisms found on earth.
What are all organisms on earth today are modified descendants of?
common ancestor
What is the study of life?
Biology
What are the 2 central activities at the study of biology?
posing questions and seeking answers through inquiry
What are the five unifying themes in biology that provide BIG IDEAS to help in our thinking about life?
Organization, information, energy and matter, interactions, and evolution
What are the levels of biological organization in order of largest to smallest?
Biosphere, ecosystem, community, population, organism, organ, tissue, cells, organelles, molecules.
What are the levels of biological organization in order of smallest to largest?
Molecules, organelles, cells, tissue, organ, organism, population, community, ecosystem, biosphere.
What are the two ends of the study of life?
the microscopic scale of the molecules and cells that make up organisms to the global scale of the entire living planet.
Define emergent properties:
properties which arise in more complex structures and that did not exist at simpler levels of organization
What is reductionism?
a method by which complex systems are broken down and the individual components are studied.
What is systems biology?
a method by which scientists construct models which allow biologists to predict how a change in one or more variables will affect other components.
What correlation exists at every level of biological organization?
structure and function
What is the saying about structure and function?
Form Follows Function
What are cells
the basic unit of structure and function in living organisms and is the smallest unit of organization that can perform all activities required for life
Who was the first scientist to describe and name cells in 1665
Robert Hocke
What cells did Hocke look at?
Cork cells
Who constructed the first true microscope and observed single celled organisms in pond water?
Antonie van Leeuwenhoek
Who helped form the first two parts of the cell theory in 1838.
Theodore Schwann and Matthais Schlieden
What did Theodore Schwann study?
animals
What did Matthias Schleiden study?
plants
Who added the third part of cell theory in 1855?
Rudolf Virchow
What is the first part of cell theory
all living organisms are composed of one or more cells
What is the second part of cell theory?
A cell is a basic structural and functional unit of living organisms
What is the third part of cell theory?
All cells arise from pre-existing cells
What 4 things do all cells have?
Genetic material (DNA), Plasma membrane, ribosomes, and cytosol
What is a prokaryotic cell?
a cell that lacks membrane bound organelles and nucleus.
What are 2 examples of prokaryotic cells?
eubacteria/archaebacteria
What is a eukaryotic cell?
a cell that has a membrane bound nucleus and organelles
What are 2 examples of a eukaryotic cell?
plants & animals
Within cells, structures called ___________ contain genetic material in the form of ______
chromosomes; DNA
What does DNA stand for?
Deoxyribonucleic acid
What are nucleotides
repeating units (building blocks)
What are DNA molecules composed of
nucleotides
The __________ sequence acts as a template that codes for _________ which act as the tools of the cell.
Nucleotide (DNA); a protein
What is the process of protein synthesis (list the steps)
DNA –> Transcription –> mRNA –> Translation –> Chain of amino acids –> Protein folding –> Protein
What is gene expression
the entire process by which the information in a gene directs the production of cellular product
In protein synthesis, DNA is transcribed into the intermediary molecule _____ which is then translated into _____________, and ultimately folded into a functional or structural ___________.
mRNA; a chain of acids (polypeptide chain); protein
What is the universality of the genetic code is a strong piece of evidence for?
all life is related