Which of the following statements is false?
A) Scientists have a clear understanding of the origin of cells.
B) All living cells are believed to have evolved from a single, common ancestral cell often refered to as the last universal common ancestor
C) All cells are surrounded by a membrane
D) Evidence indicates that life arose over 3 billion years ago.
E) Evolution of cells continues today
Ans: A) Scientists have a clear understanding of the origin of cells.
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Answer the following questions
a. Over time, pressure and heat transformed the compacted organic remains of Carboniferous forests into ____. b. Ancient relatives of ____ and ____ dominated in the Carboniferous forests.
Development of the human embryo's heart begins in the ________ week.
A. 16th B. 6th C. 1st D. 3rd E. 24th
The ______ describes a species as groups of organisms that interbreed, have a shared _____l, and are reproductively isolated from all other species.
What will be an ideal response?
Water diffuses through certain organs such as the kidneys and bladder much faster than would occur by passive diffusion through a lipid bilayer alone. What accounts for this more rapid rate of water transport in these organs?
A. The composition of lipids changes to promote water transport. B. Presence of aquaporin channels for facilitated diffusion of water. C. Presence of a water pump. D. Presence of an ATP-driven enzyme for water transport. E. The presence of molecules that bind water and change its membrane permeability properties.