unit 1
a circular representation of data consisting of divided sections that make up the whole
pie chart
What are the basic structural units of all living organisms?
Cells
Which term is defined as a genotype composed of two identical alleles?
homozygous
an assumption used in the relative dating of rocks
The sediment that the rock is taken from is not disturbed by a geological event.
define hibernation
a period of time in which an organism stops or slows its normal functions
similarity between scientific laws and scientific theories
Both can change in light of new evidence.
shape of DNA
double helix
define dominance
a phenomenon when one allele masks the effects of the other
How are the ages of extinct organisms determined?
by studying the concentration of radioactive atoms in their fossils
Which organism exhibits dormancy?
some protists
What is a model?
a simplified, constructed version of a complex object or idea
Which scientist discovered that new cells only come from existing cells?
Louis Pasteur
In a pedigree diagram, what is the difference between a filled-in circle and a filled-in square?
The filled-in circle represents an affected female, and the filled-in square represents an affected male.
first known mass extinction
The first known mass extinction is in Precambrian era. It was caused by oxygen. Oxygen was produced by some types of bacteria performing photosynthesis. This event wiped out most of the bacteria that did not use oxygen.
what happens when a plant cannot maintain homeostasis?
Its cells will decrease function, and it will eventually die.