CELL
Which is the correct sequence of historical developments leading to our present knowledge of cells?
A. electron microscope – cell theory – compound light microscope.
B. compound light microscope – cell theory – electron microscope
C. cell theory – electron microscope – compound light microscope
D. electron microscope – compound light microscope – cell theory
B. compound light microscope – cell theory – electron microscope
Why are open circulatory systems advantageous to some animals?
A They use less metabolic energy.
B They help the animal move faster.
C They do not need a heart.
D They help large insects develop.
A. They use less metabolic energy.
Amino acids are connected together in a chain by what type of bond?
Hydrogen
Covalent
Van der Waals
Ionic
Covalent
Homeostasis in unicellular organisms depends on the proper functioning of
A. organelles
B. insulin
C. guard cells
D. antibodies
A. organelles
Some animals use diffusion instead of a circulatory system. Examples include:
A birds and jellyfish
B flatworms and arthropods
C mollusks and jellyfish
D None of the above
D
he complex 3-D structure of this molecule is made up of a primary, secondary, tertiary, and sometimes a quaternary levels.
Nucleic acid
Protein
Carbohydrate
Lipid
Protine
Every single-celled organism is able to survive because it carries out
A. metabolic activities
B. autotrophic nutrition
C. heterotrophic nutrition
D. sexual reproduction
A. metabolic activities
n humans, the plasma comprises what percentage of the blood?
A 45 percent
B 55 percent
C 25 percent
D 90 percent
B
here is a coating on the feathers of waterfowl such as ducks that keeps them from getting wet. What molecule would this water-repelling coating be made of?
Carbohydrate
Nucleic acid
Protein
Lipid
Lipid
Which statement best describes the plasma membrane of a living plant cell?
A. It selectively regulates the passage of substances into and out of the cell.
B. It is composed of proteins and carbohydrates only. C. It has the same permeability to all substances found inside or outside the cell.
D. It is a double protein layer with floating lipid molecules.
A. It selectively regulates the passage of substances into and out of the cell.
lood flow that is directed through the lungs and back to the heart is called ________.
A unidirectional circulation
B gill circulation
C pulmonary circulation
D pulmocutaneous circulation
C
You are studying a newly discovered species and want to analyze its genetic information. What type of molecule would you analyze?
Lipid
Protein
Nucleic Acid
Carbohydrate
Which sequence represents the correct order of levels of organization found in a complex organism?
A. cells → organelles → organs → organ systems → tissues
B. tissues → organs → organ systems → organelles → cells
C. organelles → cells → tissues → organs → organ systems
D. organs → organ systems → cells → tissues → organelles
C. organelles → cells → tissues → organs → organ systems
Cardiomyocytes are similar to skeletal muscle because:
A they beat involuntarily
B they are used for weight lifting
C they pulse rhythmically
D they are striated
D
he breakdown of polymers into monomers occurs through a process known as ______________.
a) hydrolysis
b) denaturation
c) condensation reaction
d) dehydration synthesis
A Hydrolysis.