Which piece of evidence would strongly support the RNA-first hypothesis?
A. discovering a way to make RNA more stable than DNA
B. being able to build microspheres that contain only protein and RNA
C. finding a mechanism whereby proteins could assemble DNA out of free nucleotides
D. finding a protocell that could carry on metabolism as well as reproduce
E. finding a living organism that uses RNA as its genetic material
Answer: E
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The Eustachian tube carries air from the middle ear to the
a. larynx. b. inner ear. c. pharynx. d. oval window. e. round window.
What is the function of the plasma membrane in a photosynthetic eukaryotic cell?
A) It converts carbon dioxide and water into sugars. B) It isolates the cell's contents from the external environment. C) It controls protein synthesis in the cell. D) It recycles old extracellular material.
Pseudoscience
A. uses science to solve practical problems. B. is the purest form of science. C. has no factual basis. D. may interpret scientific facts to deceive.
Autophagy is an important process that removes worn-out organelles, recycles components, then releases them into the cytosol.
Answer the following statement true (T) or false (F)