Angiomax® (bivalirudin) is an anticoagulant currently approved in the United States for use in patients undergoing coronary angioplasty procedures. This drug was developed using scientists' knowledge of animal feeding strategies. Which type of organism would most likely be the source of this drug?
A. baleen whales that filter large amounts of seawater
B. scavengers that must eat rotten meat
C. herbivores that must digest fibrous material
D. fluid feeder that drinks blood
E. sessile feeder that traps food on sticky surfaces
D. fluid feeder that drinks blood
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Meselson and Stahl relied on equilibrium density gradient centrifugation in a ________ solution to resolve the DNA containing 14N from the DNA containing 15N.
A) radiolabeled phosphate B) calcium chloride C) radiolabeled nitrogen D) sodium acetate E) cesium chloride
The nonprotein component of an enzyme that is firmly attached to the protein is called a(n)
A. holoenzyme. B. coenzyme. C. prosthetic group. D. apoenzyme.
The balance between osteoblast and osteoclast activities is an example of homeostasis and is regulated by the action of two hormones.
a. true b. false
The primary difference between enhancers and promoter-proximal elements is that enhancers _____
A) are transcription factors; promoter-proximal elements are DNA sequences B) enhance transcription; promoter-proximal elements inhibit transcription C) are at considerable distances from the promoter; promoter-proximal elements are close to the promoter D) are DNA sequences; promoter-proximal elements are proteins