The fossil record is more complete for dinosaurs with bones than it is for soft-bodied creatures like worms. This is most likely because:

 You have recently discovered a single-celled organism that has not been described before.  It lacks a nucleus, has a thick layer of peptidoglycan associated with its cell membrane, and is sphere-shaped.  Genetic analysis confirms that its genes do not contain any introns.  This organism is most likely

Which of the following statements is true of two sister chromatids that are joined at the centromere prior to mitosis?

In a cell with 16 chromosomes, you will find _____ sister chromatids after the S-phase of mitosis?

A rare illness in a child was determined to be the result of the production of antibodies to signal recognition particles (SRP) in her muscle cells.  These antibodies destroyed her SRPs before they were able to carry out their function.  Based on this information, which of the following is most likely to occur?       

All of the protists that are called “algaes”

You took a sample of water from a stream that you crossed while hiking in the Allegheny Mountains.  Analysis of the organisms living in the water include an organism that is a heterotrophic decomposer with cell walls made of cellulose and flagella with hair-like structures.  This organism is most likely a ___________________.

A biologist discovers a new species of marine alga that is photosynthetic and can live at depths reached only by blue light.  This alga is most likely a type of __________________________.

True or False?  All organisms considered protists are eukaryotes.

An individual presenting with a mysterious disease affecting his connective tissues is found to have numerous defects in multiple regulatory proteins. If these proteins are characterized by highly abnormal patterns of glycosylation, to what cell structure might the patient’s disease most likely be attributed?