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
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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
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
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.
Malignant tumors are characterized by:
a. metastasis. b. abnormal cell growth. c. the formation of cell masses. d. specific mutations. e. proto-oncogenes.