Which of the following statement is true about helicase?

A. Helicase adds nucleotides to DNA
B. Helicase unzips DNA
C. All of the above
D. Helicase transcribes RNA


Answer: B. Helicase unzips DNA

Biology & Microbiology

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What functional group is not present in the following structure for thyroxine (thyroid hormone)?

a. carboxylic acid b. organic halide c. amine d. all of the above

Biology & Microbiology

The end of a skeletal muscle attached to a bone that does not move during contraction is called the origin.

a. true b. false

Biology & Microbiology

Which of the following infectious particles do not have protein in their structure?

A) bacteriophages B) prions C) animal viruses D) viroids E) both prions and viroids

Biology & Microbiology

Which of the following elements is essential for ALL bacterial cells but is considered a micronutrient required at relatively low levels?

a. calcium b. phosphorus c. nitrogen d. selenium

Biology & Microbiology