What enzyme converts angiotensinogen into angiotensin I?
A) mucin
B) angiotensin converting enzyme (ACE) C) atrial natriuretic peptide
D) renin
E) carbonic anhydrase
Answer: D) renin
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Virginia was working as an undergraduate lab technician, and the graduate student she was working with instructed her to take some E. coli, and treat the culture with MgCl2 and CaCl2 to make the cells competent. Once Virginia produced the competent cells, she was able to
A. make them replicate their own DNA without an origin of replication B. make them susceptible to bacteriophage C. make them pass their DNA to a recipient cell via conjugation D. make them take up naked DNA from their environment E. None of these are correct
Which of the following animals do NOT have
tissues?
a. sponges b. annelids c. roundworms d. cnidarians e. more than one of these animals does not have tissues
An organic compound that is composed of a carbon, hydrogen and oxygen in a 1:2:1 ratio is known as a:
a. lipid b. carbohydrate c. salt d. nucleic acid e. protein
In flatworms, the action of ciliated __________ draws interstitial fluid into a system of tubes that delivers it to the body surface.
Fill in the blank(s) with the appropriate word(s).