ecosystems
What is a food web?
a system of intersecting food chains
What is a "transition"?
A substitution of a purine nucleotide by another purine.
What is a hormone?
One of many substances made by gland in the body
What is a prey?
an organism that is hunted for the benefit of the predator
What is an anther
the male part of a plant that produces and contains
pollen
what is a producer?
an organism that produces its own food
what is a "codon"?
a sequence of three nucleotides that together form a unit of genetic code in DNA or RNA codes.
What is a hormone receptor?
proteins that bind hormones
What is parasitism
When one organism takes from another organism to survive
What is a stigma
the female part of a plant that receives pollen
what is the 10% rule?
only 10% of energy stored as biomass in a tropic level is passed from one level to the next
what holds one strand against the other in the double helix?
hydrogen bonds
What do enzymes do?
speed up the rate of a specific chemical reaction in the cell.
What is mutualism?
A relationship between two organisms where both benefit
Where are roots usually found?
normally underground collecting water for the plat to survive
What is a tertiary consumer?
an organism that eats secondary consumers ( usually large organisms )
how do cells make accurate copies of DNA?
through the process of DNA replication they create two daughter cells from the main cell
how do nutrients move into our bodies
The walls of the small intestine absorb the digested nutrients into the bloodstream.
What is commensalism?
A relationship where one organism gets benefits but the other organism stays neutral
How is a shoot different from a root?
The shoot is usually above the ground and includes the stem and its parts.
explain what energy flow is
Energy flow takes place via the food chain and in food webs
When do cells duplicate their DNA?
during mitosis
Which body system is the heart in?
In the cardiovascular system
What is competition?
When two or more organism over one or more prey for energy
What two vascular tubes are found in plants?
a system that has vessels or is made of tubes