The original cell was thought to have arisen from the enclosure of self-replicating _______ by a phospholipid membrane.

a. DNA
b. carbohydrate
c. protein
d. RNA


Ans: d. RNA

Biology & Microbiology

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Human vertebrae are held together by ____ joints

a. synovial b. cartilaginous c. fibrous d. both fibrous and cartilaginous e. both synovial and fibrous

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The multiple effects of a single gene on the phenotype of an organism is called _______

A. epistasis B. penetrance C. expressivity D. overdominance E. pleiotropy

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The parasite that is responsible for causing malaria is called  

A.  Paramecium. B.  Chlamydomonas. C.  Plasmodium. D.  Entamoeba. E.  Giardia.

Biology & Microbiology

Plastids evolution began when an ancestral cell engulfed what?

a. a spirochete b. a cyanobacteria c. a mitochondria d. green algae

Biology & Microbiology