A characteristic of phospholipids that makes them a candidate for the first organic compounds on Earth to be related to life is their ability to ________.
A. form liposomes
B. self-assemble into simple membranes
C. transduce signals
D. mix freely with water
B. self-assemble into simple membranes
You might also like to view...
Algae in the genus Caulerpa typically grow to a length of over half a meter and have structures similar to stems, leaves, and roots. Reproduction occurs when adults produce sperm and eggs that fuse to form offspring. Algae in the genus Caulerpa typically grow to a length of over half a meter and have structures similar to stems, leaves, and roots. Reproduction occurs when adults produce sperm and
eggs that fuse to form offspring. Each adult Caulerpa consists of just a single cell, however. Which of the following statements is true? A) Caulerpa violate the pattern component of the cell theory that all organisms consist of cells. B) Caulerpa violate the process component of the cell theory that all cells come from preexisting cells. C) Caulerpa violate both the pattern and process components of the cell theory. D) The existence of Caulerpa is consistent with the cell theory.
The beads-on-a-string form of DNA condenses into a compact fiber called the 30 nm filament. Which of the following is true about its formation?
A. Histone H1 is essential for formation of the 30 nm filament. B. The histone tails of the octamer histones are absolutely required for filament formation. C. The zigzag model describes how the nucleosome array adopts a spiral shape when forming the filament. D. The 30 nm filament is also called a tetranucleosome. E. The linker histone is essential for formation of the 30 nm filament.
Which group of organisms are viroids (not viruses) most likely to parasitize?
a. cattle b. fungi c. plants d. fish e. bacteria
Which of the following sets of characteristics describes the highest level of threat potential from biological weapons?
A) a waterborne toxin that is easily introduced into public water supplies and does not replicate in humans B) a pathogen of livestock transmitted by contact with infected animals but not infected people C) a human pathogen easily produced as an aerosol and transmissible by respiratory aerosols D) a pathogen of wheat that could be delivered using crop dusters E) a microbe that can be introduced into food during packaging and withstands refrigerator temperatures but not typical cooking temperatures