What occurs when a photosynthetic protist is taken up by a heterotrophic protist and evolves into a chloroplast?

A. Multicellularity
B. Primary endosymbiosis
C. Colonialism
D. Chloroplasty
E. Secondary endosymbiosis


Answer: E

Biology & Microbiology

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Pollination is the arrival of pollen grains from the ________ on a receptive ________

a. anther / stigma b. style / stigma c. stigma / anther d. sepal / style

Biology & Microbiology

Which of the following represents the correct order of structures from outside to inside for a stem that

has a vascular cylinder?

a. stele, cortex, epidermis, pith b. epidermis, pith, cortex, stele c. cortex, stele, pith, epidermis d. epidermis, cortex, stele, pith e. stele, epidermis, pith, cortex

Biology & Microbiology

Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a membrane more fluid at lower temperatures?

A) The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly. B) Unsaturated fatty acids have a higher cholesterol content and, therefore, more cholesterol in membranes. C) Unsaturated fatty acids are more polar than saturated fatty acids. D) The double bonds block interaction among the hydrophilic head groups of the lipids.

Biology & Microbiology

Malignant tumors are characterized by:

a. metastasis. b. abnormal cell growth. c. the formation of cell masses. d. specific mutations. e. proto-oncogenes.

Biology & Microbiology