How can changing one thing in one experimental trail but not the other change the results?
inaccurate results
100
Each normal human has 23 of these
What is chromosomes
100
This type of organism prevent Earth from being covered with bodies of dead organism
What is a decomposer
100
This is uncovered tissues is the greatest danger to a patient who has had damage to the skin
What is infections
200
This is how eukaryotic cells differ from prokaryotic cells?
they have a nucleus
200
An educated guess
What is a hypothesis
200
The missing letters are:
5' G T A _ _ _ A A 3'
3' C A T G C A T T 5'
What is C G T
200
This type of organism is at the top of an energy pyramid
What is a primary consumer
200
Signaling muscle tissues to contract is a function of this system
What is the nervous sysytem
300
which molecule in plant cells first captures the radiant energy from sunlight?
what is chlorophyll
300
A computer model of cellular mitosis
can simulate the aspects of cellular division quite well. However, microscopic observation of actual cellular mitosis can improve understanding because actual observations
may reveal unknown things
300
This occurs only in cells in the reproductive structures of the organism
What is meiosis
300
An individual is a carrier of a lethal allele but is not affected by it, he contains these two types of alleles.
What is dominant and recessive
300
This system depends on nervous system for signals to coordinate muscles controlling breathing
What is the respiratory system
400
The first stage of photosynthesis in a chloroplast is
light-dependent
400
Two students were testing the amount of
fertilizer that would best promote the growth of strawberries in a garden.What could be an unavoidable source of experimental error?
variation in the straw berries
400
This sequence represents what:
n + n = 2n
What is fertilization
400
Complete burning of plant material returns carbon primarily to the what
What is the atmosphere
400
This gland secretes a hormone that regulates the role of metabolism in the body
What is thyroid
500
In aerobic respiration, the Krebs cycle (citric acid cycle) takes place in
mitochondria
500
Which information was most important to the development of genetic engineering techniques?
The structure of a DNA molecule
500
This is the percentage of probability of producing a female
What is 50%
500
A high degree of this contains many different species existing in the same area at the same time.
What is biological diversity
500
This is a signal that the bladder is full and is sent to the central nervous system