Cells
semi-permeable barrier
cell membrane
movement of materials from high to low concentrations
diffusion
in an experiment to test the effect of exercise on the number of times a clothespin can be squeezed in 1 minute, the dependent variable is
the number of times a clothespin can be squeezed
This type of protein is responsible for breaking down food chemically in the digestive system
enzymes
The bottom level of an energy pyramid is made up of what type of organism?
autotroph/producers
nucleus
name a technique used to compare fragments of DNA
gel electrophoresis
State one factor scientists can look at to determine if two species are related.
fossils, body structure, DNA, proteins.
This body system is responsible for removing urea and other waste from the body
excretory system
state two negative impacts humans have had on the ecosystem
deforestation, global warming, increase CO2 levels, moving organisms out of habitats, etc
mitochondria
starch will be broken down into subunits of
glucose/simple sugars
State the process that results in over 90 species of birds in the Bronx.
Evolution.
This type of cell fights pathogens
white blood cells, antibodies
Name one biotic factor and one abiotic factor
biotic - anything living
abiotic - anything not living (sunlight, water, nutrients, air, etc)
site of protein synthesis
ribosome
changing an amino acid in a protein will result in a change in that protein's...
function
This process is considered asexual reproduction.
mitosis
Fill in the blanks:
organelles > ______ > tissues > _______ > organ systems
cells, organs
Name one reason a population might decrease in an ecosystem
limited food, increased predators, limited space
state two differences between plant and animal cells
-cell wall
-chloroplasts
-photosynthesis
-large vacuole
A technique used to alter DNA by cutting a piece of DNA out using enzymes and inserting in a new piece is called...
genetic engineering
State the error in the following hypothesis:
"Does exercise affect heart rate?"
it is phrased as a question.
cell specialization
T/F: a less diverse ecosystem will be more stable than a more diverse ecosystem because it can withstand change.
False. The ecosystem should be more diverse to be more stable.