Which of the following organelles can be found in all prokaryotes and eukaryotes?

a. ribosomes
b. cell membrane
c. capsule
d. ribosomes and cell membrane


d. ribosomes and cell membrane

Biology & Microbiology

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The nuclear envelope is a single lipid layer.

Answer the following statement true (T) or false (F)

Biology & Microbiology

All of the following statements concerning the evolutionary species concept are true EXCEPT

A. an evolutionary "family tree" is used to identify species based on a common ancestor. B. it relies on identification of certain morphological traits to distinguish one species from another. C. abrupt changes in traits are indicative of the evolution of a new species in the fossil record. D. it requires that the members of a species share a distinct evolutionary pathway.

Biology & Microbiology

Certain body sites contain sequestered molecules, called ________ that escaped assessment during development of immune tolerance and are mistaken as foreign.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

You sit next to Uncle Ed, an immunologist, at Thanksgiving dinner. "I'm a 'big eater'," he says, "just like the cells I study." What are the large cells that engulf pathogens that Uncle Ed works with?

A. Monocytes B. Antibodies C. Bacteriophages D. Macrophages E. Erythrocytes

Biology & Microbiology