Why might a seed be covered in prickly hooks?
A) To aid in seed dispersal
B) To allow it to float on water
C) To keep it from being eaten
D) To help the seed germinate
E) To attract insects
A
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A main source of omega-3 fatty acids is:
a. fish b. red meat c. dairy products d. soy e. olive oil
Which of the following statements is true about the production of the influenza vaccine?
A. A protein responsible for the H spikes of the flu virus is added to a harmless virus that infects insect cells, causing them to produce massive amounts of H spike protein. The extracted H spike protein is then purified and used to make vaccines. B. Viruses are injected into mammalian cells, then viral particles are extracted, purified, and used to make vaccines. C. Viruses are injected into fertilized eggs, incubated, then viral particles are extracted, purified, and used to make vaccines. D. All three methods describe different approaches used to make flu vaccines.
You explain to your study group that a hypothesis is:
A. an explanation that accounts for careful observations. B. a proposition that will be true and fits the known facts. C. constant over time. D. a theory.
Disease-causing bacteria are called
A) pathogens. B) cyanobacteria. C) viroids. D) archaea. E) protozoa.