The lipid components of cellular membranes often include:
A) phospholipids
B) phospholipids and fatty acids
C) phospholipids and cholesterol
D) fatty acids and cholesterol
Ans: C) phospholipids and cholesterol
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Which of the following does not occur when antidiuretic hormone is present?
A. Water diffuses into the collecting duct from the interstitial fluid. B. The collecting duct walls become permeable to water. C. Aquaporins insert in the membrane of the collecting duct cells. D. The urine in the collecting duct becomes more concentrated. E. All of these events occur when antidiuretic hormone is present.
The primary producers associated with hydrothermal vents are ____
a. dinoflagellates b. archaea c. red algae d. diatoms e. sea kelp
Which one of the following x-linked disorders is caused by an abnormal number of repeat sequences in the genome and is the most common cause of inherited mental impairment?
A) fragile X syndrome B) Klinefelter syndrome C) Williams syndrome D) cri du chat syndrome E) Down syndrome
Which of the following is the least likely vaccine against HIV?
A) attenuated virus B) glycoprotein C) protein core D) subunit E) All of these vaccines are equally likely.