Match the following enzymes involved in DNA replication with their functions. - unwinds the DNA structure and makes it lay flat
- adds new nucleotides to each strand and a subunit proofreads the new nucleotides
- seals the fragments into one long strand
- makes a dent in the double helix and then begins to unzip it

DNA ligase
DNA gyrase
helicase
DNA polymerase

What statements describe a host organism?

If two parents who's blood types are both b produce a child that has blood type o, what can you say about the parent's genotybes? oa) one is ii ob) one is ibi oc) both are bi od) nothing, this is impossible

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food