Cells
Who first observed cells in a piece of cork?
a. Anton van Leeuwenhoek
b. Robert Hooke
c. Matthias Schleiden
d. Theodor Schwann
b. Robert Hooke
What is the basic unit of structure and organization of all living things?
a. Atom
b. Molecule
c. Cell
d. Tissue
c. Cell
Which type of transport requires energy to move particles against the concentration gradient?
a. passive transport
b. facilitated diffusion
c. active transport
d. osmosis
c. active transport
which factor does not depend on the number of members in a population per unit area?
a. density-dependent factor
b. density-independent factor
c. biotic factor
d. abiotic factor
b. density-independent factor
what term describes the number of individuals moving away from a population?
a. immigration
b. emigration
c. natality
d. mortality
b. emigration
Which type of microscope uses visible light and lenses to magnify an object?
a. Electron microscope
b. Compound light microscope
c. Scanning Tunneling electron microscope
d. Transmission electron microscope
b. Compound light microscope
What is the maximum magnification of a compound light microscope without blurring?
a. 100x
b. 500x
c. 1000x
d. 500,000x
c. 1000x
what is the process by which a cell surrounds a substance in the outside environment, enclosing it in a portion of the plasma membrane?
a. exocytosis
b. endocytosis
c. osmosis
d. diffusion
d. endocytosis
what term describes the variety of genes or inheritable characteristics present in a population?
a. species diversity
b. genetic diversity
c. ecosystem diversity
d. population diversity
b. genetic diversity
what is the condition of the atmosphere at a specific place and time called?
a. climate
b. weather
c. latitude
d. elevation
a. climate
What is the boundary that helps control what enters and leaves the cell?
plasma membrane
Which type of cell lacks a nucleus and other membrane-bound organelles?
what is the scientific discipline that studies the relationships among living organisms and their interactions with the environment?
ecology
What process concerts nitrogen gas into ammonium?
Nitrogen fixation
what is the maximum number of individuals in a species that an environment can support for the long term called?
carrying capacity
What is the central organelle that contains the cell's genetic material in the form of DNA?
nucleus
what is the process of maintaining balance in an organism's internal environment?
homeostasis
what is a group of organisms of the same species that interbreed and live in the same place at the same time called?
population
what is the total mass of living matter at each trophic level called?
Biomass
what is the first trophic level in all ecosystems made up of?
autotrophs
Which component of the plasma membrane helps prevent phospholipid tails from sticking together?
cholesterol
What is the net movement of particles from an area of high concentration to an area of low concentration?
diffusion
which type of symbiotic relationship benefits both organisms involved?
mutualism
what term describes organisms that produce their own food using sunlight or inorganic substances?
autotrophs
which type of heterotroph preys on other heterotrophs?
carnivore