ch 1
These two major types of cells differ primarily by the presence or absence of ___________.
Nucleus. Prokaryotic and Eukaryotic.
this type of evidence is considered weak because it doesn't rely on laboratory experiences or systematic testing.
anecdotal evidence.
Two atoms have identical atomic numbers but different mass numbers. one is radioactive and used as a biological tracer. this difference is caused by a variation in the number of _______ (subatomic particle).
Neutrons.
How many covalent bonds would an atom with 6 valence electrons make.
2.
This property of water allows organisms to prevent a rapid temperature change.
High specific heat.
This process explains how traits are passed from parents to offspring.
Heredity.
Correlation doesn't imply causation. This statement warns agaisnt what kind of error.
Assuming cause-and-effect without evidence.
Carbon can make 4 covalent bonds because
it has 4 electrons in the outter shell.
a positively charged Ion is called
Cation
Despite their diversity, all living organisms share this universal system.
DNA genetic code.
Is DNA stable or unstable?
Stable.
A claim that can't be tested or repeated.
Pseudoscience
protons
neutrons
electrons.
a negative charged ion is called
Anion
The reason water molecules stick to each other rather than repelling each other, is primarily due to:
hydrogen bonding.
What does DNA stands for.
Deoxyribonucleic acid.
This biological theme explains why altering the nucleotide sequence of DNA can simultaneously affect protein structure, organismal traits, and evolutionary fitness.
Relationship between heredity, structure-function, and evolution.
a subatomic particle that contains a positive charge
proton.
An atom with atomic number 12, and mass number 24, contains how many neutrons?
12.
This chemical property of water enables nutrient transport in plants from roots to leaves.
Cohesion, adhesion
The observation that cilia in very different organisms share a similar structure support what kind of idea?
Common ancestry/ unity of life.
The fact that all living organisms use DNA, share essencial cellular structures, and rely on metabolic actitivies to sustain life, is best explained by a single unifying principle emphasized during lecture. It is said that most all organisms most likely share a comon _________, which is explained through _______ through _____ ______.
Ancestor. Evolution through common ancestry.
the region of the atom that homes the protons and neutrons
nucleus.
Chemical reactions are defined by the rearrangement of matter through the making and breaking of _____
Chemical bonds.
how many bones in a newborn?
206 bones.
around 270 bones.