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