How is contrast in microscopy most commonly achieved?
A. Increasing the resolution or resolving power
B. Changing objectives for various specimens
C. Staining techniques
D. Adding a blue filter to the light path
Ans: C. Staining techniques
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Transcriptional regulation is considered negative when an inducer binds to and deactivates a repressor
Indicate whether the statement is true or false.
Duchenne muscular dystrophy
a. is an X-linked recessive disorder. b. affects about one in 3,500 boys. c. inevitably results in death by age 25. d. results from an abnormal structural protein in muscle cells. e. fits all of these descriptions.
Presently, it is thought that organic polymers may have formed and accumulated on:
a. silt and sand. b. sand and mud. c. rocks and clay. d. water and shells. e. sand and heavy metals.
The Z line consists of parts of actin filaments on two adjacent sarcomeres
____________________ Indicate whether the statement is true or false.