Which of the following is NOT a characteristic of phospholipids?
A) They are found in cellular membranes.
B) They can form micelles and bilayers.
C) They contain fatty acids that associate with water.
D) They contain a hydrophilic phosphate "head."
E) They contain two fatty acids and a phosphate functional group.
C
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Isoetes is the only species of (living) lycophytes that contains ____
Fill in the blank with the appropriate word.
In final preparation for a climb up Mt. Everest, climbers take up residence at base camp for a period of days to weeks before the climb. During this time, the climbers must acclimate physiologically to the low oxygen levels. Out of a group of ten climbers, one is unable to acclimate to the low oxygen levels, so he cannot make the final part of the climb. What would explain his lack of acclimation?
A. The levels of erythropoietin in his system are too low. B. The levels of hemopoietin in his system are too low. C. The levels of renin-angiotensin in his system are too low. D. The levels of adrenocorticotropin in his system are too low.
Creutzfeldt-Jakob disease is caused by a
1.bacteria. 2.retrovirus. 3.bacteriophage. 4.viroid. 5.prion.
RNAs that can act as enzymes are called ________
A) ribozymes B) ATPs C) lysosomes D) prokaryotes