A restriction enzyme is a ____
a. viral enzyme that randomly cuts DNA
b. DNA ligase enhancer
c. bacterial enzyme that cuts DNA at specific sites
d. single-stranded RNA molecule
e. bacterial enzyme that functions in DNA replication
c
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Eukaryotic mRNAs are modified by addition of a poly(A) sequences at the 3' end and 7-methyl guanosine at the 5' end.
Answer the following statement true (T) or false (F)
There are _______ major families of DNA containing viruses that infect vertebrates
A. 2 B. 4 C. 5 D. 7
Modern eukaryotic cells appeared ____ billion years ago
a. 0.5
b. 1 c. 1.5 d. 2 e. 3.7
Which of the following correctly illustrates the sequence of the origin of modern groups of plants?
A) gymnosperms, ferns, bryophytes, angiosperms
B) bryophytes, ferns, gymnosperms, angiosperms
C) bryophytes, ferns, angiosperms, gymnosperms
D) ferns, gymnosperms, angiosperms, bryophytes