This molecule catalyzes covalent bond formation between fragments of DNA.

A. helicase
B. ligase
C. polymerase
D. primase
E. nuclease


B. ligase

Biology & Microbiology

You might also like to view...

Which disease CANNOT be prevented via the use of a vaccine generated from an attenuated pathogen?

A) malaria B) measles C) mumps D) rubella

Biology & Microbiology

Yeast research with autonomously replicating sequences (ARS), along with digestion of chromatin with DNase I, have led scientists to determine that

A) DNA is not protected inside a nucleosome. B) ARSs are really plasmids. C) ARSs bond irreversibly to replication enzymes. D) origins of replication are accessible regions of DNA devoid of nucleosomes.

Biology & Microbiology

How do helper T-cells and cytotoxic T-cells work together?

a. Helper T-cells produce cytotoxic T-cells. b. Cytotoxic T-cells attack abnormal body cells, while helper T-cells attack virally infected cells. c. Helper T-cells produce cytokines to activate other cells of the immune system. d. Cytotoxic T-cells produce cytokines to activate helper T-cells.

Biology & Microbiology

What mechanism leads to changes in allele frequencies due to random chance?

A. Sexual selection B. Neutral variation C. Genetic drift D. inbreeding E. Natural selection

Biology & Microbiology