---

---

Select your answer:
         

Next Quiz >

Topics:

Common Diseases in Human Beings Pulmonary System A&P Musculoskeletal Body System Linked Gene Human Organs All About Bacteria Immunisation Skeletal Tissue Stroke Heterotrophic Nutrition Mental Health Skeletal Muscle Anatomy Heart Vocab and Blood Flow Pathway Cancer & Cell Cycle

Other quiz:

Mutations, Replication, and Cancer › View

What happens first in DNA replication?

A. The molecule twists tightly

B. The molecule unwinds and unzips

C. new bases are added to the DNA

D. new sugars are added to the DNA

---

Infectious Diseases › View

Housefly and mosquito are examples of

A. causative agent

B. vector

C. infection

D. infectious agent

---