The ________ is a small lens under the stage that narrows the beam of light and directs it through the specimen on the slide
A) iris diaphragm
B) condenser
C) objective lens
D) ocular lens
B
Explanation:
A) The iris diaphragm is a series of flat metal plates at the base of the condenser.
C) The objective lenses are mounted on the nosepiece.
D) The ocular lens is the eyepiece where you place your eyes to observe the specimen.
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The complete set of genetic instructions in an individual is the ________.
Fill in the blank(s) with the appropriate word(s).
All but one of the following statements is true with regard to the blood testis barrier. Select the one statement that is false
A) The barrier is made up of astrocytes that surround blood vessels in the testis. B) The barrier marks the border between the basal compartment and the adluminal compartment. C) The barrier separates the spermatocytes dividing by meiosis from exposing their unique antigens to the immune system. D) Sustentocytes form the barrier with tight junctions.
Of the following muscles of the thigh, which one does NOT pull the leg forward?
A. biceps femoris B. rectus femoris C. vastus lateralis D. vastus medialis E. vastus intermedius
Although two breast cancer genes are known, most cases are nonhereditary
Indicate whether the statement is true or false