This molecule catalyzes covalent bond formation between fragments of DNA.
A. helicase
B. ligase
C. polymerase
D. primase
E. nuclease
B. ligase
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Which disease CANNOT be prevented via the use of a vaccine generated from an attenuated pathogen?
A) malaria B) measles C) mumps D) rubella
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.
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.
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