The pitted end walls of sieve elements are called ____
a. plasmodesmata
b. sieve tubes
c. companion cells
d. perforation plates
e. sieve plates
ANSWER: e
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Which of the following relationships best describes the partial pressure of oxygen (pO2) in the lung, red blood cells, and blood plasma?
A. pO2 lung < pO2 blood plasma < pO2 red blood cell B. pO2 blood plasma < pO2 lung < pO2 red blood cell C. pO2 red blood cell < pO2 lung < pO2 blood plasma D. pO2 red blood cell < pO2 blood plasma < pO2 lung
Which of the following is not an amoeba?
A. Entamoeba histolytica B. Cryptosporidium species C. Acanthamoeba species D. Naegleria fowleri
Which is not a lipid?
A. a sterol B. a phospholipid C. a triglyceride D. a starch E. a wax
Based on your knowledge of human papillomaviruses, human papillomaviruses have RNA genomes
a. true b. false