Exam 1 Flashcards
Localize group of organisms that belong to the same species is called a
Population
What is the major distinguishing characteristic of fungi
Feed on the composed nutrients
All the organisms on your campus make up
A community
Which of the following types of cells utilize deoxyribonucleic acid as their genetic material but do not have their DNA encased within a nuclear envelope
Archaea
To understand the chemical basis of DNA. This is an example of the application of which concept of the study of biology?
Reductionism
Which branch of biology is concerned with the meaning and classifying organisms?
Taxonomy
Prokaryotes are classified as belonging to two different domains. What are the domains?
Bacteria and Archaea
Which of the following best demonstrates The unity among organisms?
The structure and function of DNA
The branch of biology that explains both the diversely and the unity of life is
Evolution
Which of these is most closely associated with Darwin
Natural selection
Unequal reproductive success
Can lead to natural selection
Which of these is required for natural selection to occur?
All of the above
In a scientific experiment the control group
Serves as a basis of comparison with the experimental group
How do hypotheses differ from theories?
Theories are more comprehensive than hypotheses
A hypothesis is a
Tentative answer to a question
Which kingdom of Eukarya consist primarily of unicellular organisms?
Protista
I newly discovered in multicellular organism obtains food by digesting dead organisms, such an organism is most likely a member of the kingdom
Fungi
Members of the kingdom plantae differ from members of the other kingdoms of eukarya in that most members of the kingdom plantae
Produce their own food
The way earth moves about the sun is most like
An electron moving around the nucleus of an atom
Isotopes of an element have the same number of ____ and different numbers of ____
Protons…neutrons
____Is an example of an element
Carbon
The four most common elements found in living things are
Carbon oxygen nitrogen and hydrogen
Which of the following elements essential to life is a trace element?
Iodine
And Adam with a positive charge has____
More protons than electrons
All Adams of the same element have the same number of
Protons
An Atom’s ____are found in its nucleus
Neutrons and protons
Beryllium’s atomic mass is 9 and it’s atomic number is 4 How many neutrons are found in a beryllium atom?
5
An uncharged Adam of gold has an atomic number of 79 and a atomic mass of 197. This Adam has____protons,____neutrons, and___electrons
79… 118… 79
Why is water considered a polar molecule?
The oxygen end of the molecule has a slight negative charge, and the hydrogen and has a slight positive charge
The tendency of molecules of the same kind of stick together is called___
Cohesion
How do you radioactive isotopes differ from isotopes?
Radioactive isotopes are on stable; isotopes are stable
Second electron shell of an Adam can hold a maximum of____electrons
8
Nitrogen has an atomic number of seven; therefore, it has____electrons in its outer most electron shell
5
An atom with an electrical charge is
Ion
What name is given to bonds that involve the sharing of electrons?
Covalent
Sweating cause your body by
Evaporative cooling
Adjacent water molecules are joined by____bonds
Hydrogen
As water freezes,
It’s molecules move further apart
A base_
Removes H+ ions from the solution
The lower the pH of a solution, the
More acidic the solution
Relative to a pH of six, a pH of 4 has a
100 times higher H+ concentration
Why does ice float in liquid water?
Hydrogen bonds stabilize and keep the molecules of ice for the part then the water molecules of liquid water
Water molecules are able to form hydrogen bonds with
Compounds that have polar covalent bonds
If a solution has a pH of 7, this means that
The concentration of H+ ions in the water equals the concentration of OH- ions in the water
The partial negative charge any molecule of water occurs because
The electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom then around the hydrogen atoms nucleus
What results from an unequal sharing of electrons between atoms?
A polar covalent bond
Which bond or interaction would be difficult to disrupt one compounds are put into water?
Covalent bond
Which of the following is a correct sequence of levels in life’s hierarchy, proceeding downward from an individual animal
Nervous system, brain, nervous tissue, nerve cell
Once labor begins in childbirth contractions increase in intensity and frequency until delivery. increasing labor contractions of childbirth or example of which type of regulation
Positive feedback
The hydrogen and oxygen of a water molecule or held together by____bonds
Covalent
