If a chloroplast in a protist has four membranes, it arose from:

a. primary endosymbiosis
b. secondary endosymbiosis
c. tertiary endosymbiosis
d. protist cell fusion
e. protist organelle replication


b

Biology & Microbiology

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The size of DNA is often given in the number of ________ that it contains.

A. triplets B. genes C. base pairs D. proteins E. codons

Biology & Microbiology

During the cardiac cycle, which of the

following is the correct order of events?

a. atria contract, atria and ventricles relax, ventricles contract b. ventricles contract, atria contract, atria and ventricles relax c. atria and ventricles relax, atria contract, ventricles contract d. ventricles contract, atria and ventricles relax, atria contract e. none of these

Biology & Microbiology

Which feature is not characteristic of all living organisms?

a. All have requirements for energy.

b. All must participate in one or more nutrient cycles. c. All have ultimate dependence upon the sun. d. All interact with other forms of life. e. All must reproduce inside of organisms of other species.

Biology & Microbiology

Auxotrophs are organisms that can grow on minimal media

1.True 2.False

Biology & Microbiology