Topic 1

1. In the illustration below, a food particle is moved across the cell membrane from the external environment. Another function of the cell membrane is  Structure A

• removal of waste
• making protein
• releasing energy
• digestion of food

2. A new animal species is discovered. It is like all other animal species in that the smallest structure that carries on basic life functions is

• a system
• an organ
• a cell
• a tissue

 Receptor proteins are important in the functioning of both the nervous and hormone—secreting systems because they are 

• involved in communication between specific cells 
• composed of carbohydrates that provide the cell with energy  
• responsible in stabilizing the shape of the cell membrane
• responsible for the transfer of DNA between body cell

Which organelle regulates the entry of  dissolved materials into the /cell? 

• vacuole
• ribosome
• cell membrane
• mitochondrion

 In the 19th century, a French scientist wrote, “All vital mechanisms, however varied they may be, have one object, ‘ that of preserving constant conditions of life in their internal environment.” Today this concept is referred to as 

• transport
• reproduction
• movement
• homeostasis

Active transport is different form diffusion in that active transport involves

• the movement of molecules form high concentration to ow concentration
• an expenditure of energy
• the use of ribosomes
• a process that occurs only in the cells of simple plants and animals

Light energy is converted to chemical bond energy in organelles called

• ribosomes
• chloroplasts
• vacuole
• mitochondria

Which letter in the diagram below indicates an organelle that functions primarily in the synthesis of long chains of amino acids

• A
• B
• C
• D

The root-like structures of fungi penetrate a source of food, secrete enzymes, and absorb the end products.  These activities are all involved I the process of

• digestion
• coordination
• photosynthesis
• excretion

Gland A secretes hormone A that stimulates gland B to release hormone B in the blood increases, the level of hormone A decreases.  This is an example of

• enzyme action
• excretion
• feedback
• active transport