Biology Midterm Review #2

An immune response to a usually harmless 

environmental substance is known as

• an antigen

• an allergy

• a vaccination

• a mutation

Single-celled organisms are able to maintain 

homeostasis, even though they lack higher levels 

of organization such as organs and organ systems, 

because

• single-celled organisms do not carry out the 

  same life processes as multicellular organisms

• multicellular organisms do not rely on tissues 

  or organs to carry out life processes

• cell structures work together to maintain 

  homeostasis in single-celled organisms

• single-celled organisms are able to coordinate 

  organ functions to maintain homeostasis

Tags

NGSS.HS-LS1-3

An immune response is primarily due to the 

body’s white blood cells recognizing

• a hormone imbalance

• abiotic organisms

• foreign antigens

• known antibiotics

A student designed an experiment to determine if air temperature had an effect on the 

rate of photosynthesis in corn plants.

The independent variable in this experiment is the

• air temperature at which the corn plants were grown

• amount of carbon dioxide used by the corn plants

• volume of oxygen produced by the corn plants

• number of corn plants used

To prepare for an experiment, ten different sources of food were sterilized and kept in a sterile container.  Bacteria of the same species were placed on each of the ten different food sources and kept at 26°C for two days. During this time, bacteria grew in nine of the containers. Based on this observation, the scientist could conclude that

• all ten food sources used in the experiment are capable of supporting this species of bacteria

• the temperature varied greatly in nine of the containers during this experiment

• only the container that failed to grow any bacteria was prepared correctly

• this species of bacteria synthesizes enzymes needed to digest the food in nine of the ten containers

Which graph best illustrates the body temperature in an individual maintaining dynamic equilibrium?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS1-3

When people receive organ transplants, they 

often need to take medications that decrease 

immune responses because

• transplanted organs contain antigens that can 

  trigger white blood cell activity

• hormones present in replacement organs 

  prevent the synthesis of antibiotics

• transplanted organs produce their own 

  antibiotics

  
  

• antigens present in these organs attack 

  antibodies already present in the blood

Scientists are developing a malaria vaccine that 

would most likely contain

• weakened drugs used to treat the symptoms 

  of malaria

• white blood cells from the malaria-infected 

  individuals

• a weakened form of the malaria-causing 

  organism

• antibodies made from the malaria-causing 

  organism

Proteins produced by B cells and designed to mark antigens to be destroyed, specific to the antigen.

• Antigens
• Active Immunity
• Antibodies
• Antibiotics

Some human white blood cells help destroy pathogenic bacteria by

• causing mutations in the bacteria

• engulfing and digesting the bacteria

• producing toxins that compete with bacterial toxins

• inserting part of their DNA into the bacterial cells