Viruses were first identified:a
because they caused an infection and formed colonies on nutrient agar plates.
b. because they were seen in the light microscope.
c. because they caused an infection and were small enough to pass through filters that
trapped bacteria.
d. because they were smaller than bacteria and had all the properties of living organisms.
e. because they caused an infection and were seen in the electron microscope.
C
You might also like to view...
It is possible to build a light microscope capable of 10,000× magnification, but the image would not be sharp because resolution is independent of magnification.
Answer the following statement true (T) or false (F)
Your friend does not believe that a platypus can be a mammal because it lays eggs like a bird or reptile. What evidence do you use to defend your position that a platypus is a mammal?
1.It is endothermic. 2.It has a cloaca. 3.It has mammary glands for milk production. 4.It does not have teeth.
Functional secondary xylem that conducts water and dissolved minerals is known as:
a. softwood. b. springwood. c. hardwood. d. sapwood. e. heartwood
Which of the following are living cells?
a. tracheids b. cork c. sclereids d. parenchyma e. vessel members