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What happens during external respiration?

What is the primary function of the loop of Henle?

What substance is NOT normally found in urine?

Which cells in the stomach produce hydrochloric acid?

Before genes can be used to produce proteins, DNA must be converted into RNA. This is done through__________.

Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are

You are trying to perform in vitro DNA replication on a small circular piece of DNA. You have DNA polymerase, Primase, Helicase, DNA ligase and all of their accessory proteins. You can get DNA replication to initiate but it never goes for very long without stopping. You visualize your small piece of DNA under an electron microscope and notice that after the initiation of replication, it looks all knotted up. What enzyme can you add to remedy this problem?

Which of the following best describes the structural model of DNA proposed by Watson and Crick?

_____________is the process of creating mRNA copies from DNA sequences. This is done by an enzyme called__________________.

Two organisms that are closely related would have