The tree in your backyard is home to two cardinals, a colony of ants, a wasp's nest (a colony of wasps), two squirrels, and millions of bacteria. Together, all of these organisms represent
The formation of systems typically results in the appearance of novel characteristics called
A scientist examining a group of cells under the microscope notices the presence of nuclei within these cells. Chemical tests reveal that each cell is photosynthetic and is surrounded by a wall composed of cellulose. These cells must come from an organism that is a member of the Kingdom
Which one of the following statements is not consistent with Darwin's mechanism of natural selection?
Individual organisms exhibit genetic change during their life spans to better fit their environment.
A scientist performs a controlled experiment. This means that
two experiments are conducted, one differing from the other by only a single variable.
Your instructor asks you to look into your microscope to see a prokaryotic cell. You will be looking for a cell that
has a membrane, but no nucleus.
Which of the following statements about radioactive isotopes is/are true?
can break chemical bonds and cause molecular damage in cells.
In plants, the transport of water from roots to leaves against the force of gravity is possible due to this property of water:
A diet high in animal products may increase the risk for atherosclerosis. This is because
most animal fats are saturated and some animal products contain trans fats
A scanning electron microscope is used to study __________, whereas a transmission electron microscope is used to study __________.
cell surfaces . . . internal cell structures
Which of the following statements is consistent with the Cell Theory?
The cell is the basic structural and functional unity of life.
We can characterize the fluid mosaic model of a membrane as ____________ floating in a sea of ___________
Large, round cells can overcome surface area to volume problems by
becoming smaller, narrower or flatter.
The membranous compartmentalization of a cell
allows different metabolic processes to occur simultaneously.
If a biologist said that eukaryotic cells get their power from bacteria, they would be referring to
the mitochondria in our cells that may have originated as endosymbiotic bacteria.
Which of the following cell structures is not associated with the breakdown of harmful substances or substances that are no longer needed by the cell?
Small, nonpolar, hydrophobic molecules such as fatty acids
easily pass through a membrane's lipid bilayer.
Diffusion does not require the cell to expend ATP. Therefore, diffusion is considered a type of
A cell that has neither a net gain nor a net lose of water when it is immersed in a solution is
isotonic to its environment
Which one of the following processes is endergonic?
the synthesis of glucose from carbon dioxide and water
Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline. This is an example of
The second law of thermodynamics states that____________.
energy tends to become increasingly dispersed and unusable.
The processes of photosynthesis and cellular respiration are complementary. During these energy conversions, some energy is
lost in the form of heat
Muscle soreness associated with strenuous exercise is at least partly due to
the presence of lactic acid produced during fermentation in muscle cells.
The terms "cristae" and "matrix" are associated with which cellular function(s)?
Krebs cycle and oxidative phosphorylation
Which of the following statements about glycolysis is correct?
production of pyruvate and occurs in the cytoplasm.
The location of the electron transport system in eukaryotic cells is
on the inner membrane of the mitochondria.
The oxygen we breathe in is needed for the process of respiration. Which of the following is the major role of oxygen in respiration?
Oxygen is the final electron acceptor at the end of the electron transfer chain.
Actinosphenia elegans is a unicellular, photosynthetic, eukaryotic organism. To which domain does it belong?
Which one of the following statements is most clearly inductively derived?
If any animals observed require organic molecules as nutrients, then it can be concluded that all animals require organic molecules as nutrients.