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Experiments are carried out to test the hypothesis by changing one variable at a time and including a ______ conditioin in which the variable is unaltered.
Biological order has _____ organization, from the level of highly structured organic molecules in the cells to the highest level of populations and communities in biomes and biosphere.
The method of reasoning that constructs general principles by careful examination of many specific cases is called:
A hypothesis can be tested with:
After making careful observations, scientists construst a _____.
do NOT always withstand the test of experiments
Darwin descreibed __________ _________ as "those individuals that possess superior physical, behavioral, or other attributes are more likely to survive than those that are not so well...
Modern pieces of evidence that corroborate Darwin's theory of evolution include:
1. New meansurements of the age of earth 2. An understanding of the mechanism of heredity 3. Comparative studies of animal structures 4. Similarities in DNA of related species
A critical requirement of Darwin's theory is:
genetic variation exists in nature
THe same basic array of bones is modified to give rise to the wing of a bat and the fin of a porpoise. Such anatomical structures are called
A medical scientist is designing an experiment to test the results of a new drug that she hypothesizes will greatly reduce and possibly eliminate the side effects of a new cancer treatment....
divide the patients into two groups and give one group the new drug and the other group a drug that has no effect.
Hierarchicial organization in living organisms:
The cell theory DOES include:
cells arise from other cells through the process of cell division, cells carry genetic material passed to daughter cells during cellular division, and energy flow (metabolism and...
All of the substances of the universe that have mass and occupy space are defined as
The number of protons in a given atom is equal to its ______ number.
Isotopes that decay with a nuclear break-up and emit a significant amount of energy are said to be
______ is defined as the negative logarithm of the hydrogen ion concentration in the solution.
A substance that interacts with H+ ions in solution, opposing any increase or decrease in concentration is a
Atoms are composed of electrons and a dense nucleus which contains protons and
Negatively charged particles of atoms with almost no mass are called
Elements that have atoms with the same atomic numbers but different number of neutrons are called:
In chemical redox reactions, the gain of an electron is called
When atoms gain or lose electrons, they become negatively or positively charged. They are known as
When two atoms share a pair of electrons, the bonding is referred to as
Water molecules are polar with ends that exhibit partial positive and negative charges. Such opposite charges make water molecules attract each other through
True statements about electrons:
1. an electron has onenegative charge 2. the mass of an electron is neglible 3. electrons are found in an area around the nucleus, called the orbital
Regardless of its shape (spherical or dumbbell), a given orbital may contain no more than
Na has 11 electrons arranged in 3 energy levels. The outer level has only 1 electron. In order to become stable, the atom loses an electron thus exposing the previous (lower) level...
1 positive charge
In the crystal matrix of ordinary salt, the sodium and the chloring are held together by
Because oxygen is more electronegative than hydrogen, the water molecule is
Two carbon atoms might be joined to each other by the sharing of two pairs of elctrons, forming a
Compared with a pH of 7, a solution of pH 5 has
100 times the hydrogen concentration
Three of the four macromolecules present in living systems are _____, which means they are built by linking together small, similar chemical components.
Proteins that can carry out catalysis in organisms are called _____.
A modified form of cellulose found in the exoskeletons of insects and crstaceans is known as _______.
Macromolecules are disassembled in ______ reactions.
All of the following are examples of functional groups in cells:
CH3 COOH NH2 OH
Nucleic acids are polymers formed of building blocks that contain
rings of nitrogen bases
Proteins are involved in all of the following functions:
structure, metabolism, membrane transport, and muscle contraction
Functional groups found in amino acids involved in peptide bonds are
COOH and NH2
Alpha helix and beta pleated sheets are examples of which level of protein structure?
The information storage molecules of cells are called
Imagine that you were able to see a nucleotide under a very special microscope. As you scan the nucleotide, you see a T nitrogen base. Without seeing any other part of the nucleotide...
it is a DNA nucleotide
Glycosydic linkages are involved in forming macromolecules known as
Examples of monomer: polymer pairing:
1. amino acids: polypeptides 2. monosaccharides: polysaccharides 3. nucleotides: DNA 4. glucose: starch
Nucleic acids are created with
The "amino end" and the "carboxyl end" of a macromolecule refer to
The 5' end and the 3' end of a macromolecule refer to