Which of the following marine organisms produce potent neurotoxins that cause extensive fish kills, contaminate shellfish, and create severe respiratory irritation to humans along the shore?

A) red algae
B) dinoflagellates
C) diplomonads
D) euglenids
E) golden algae


Ans: B) dinoflagellates

Biology & Microbiology

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Green algae are thought to be the closest relatives of

land plants for all EXCEPT which of the following reasons? a. All have cell walls of cellulose. b. All have chlorophylls a and b. c. They developed a cuticle and rhizoids that are characteristic of primitive land plants. d. They store excess carbohydrates as starch. e. All of these are true reasons.

Biology & Microbiology

What is the ultimate source of genetic variation within a population?

a. Mutations in DNA b. Adaptation of a species to environmental changes c. A sensory system that can detect an environmental change d. Homeostatic mechanisms that compensate for environmental changes e. A system of locomotion that allows an organism to escape environmental changes

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The inter-weaving of the circulatory system with the nephron is essential for the concentration of urea in the urine.

a. true b. false

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Plants are different from all other photosynthetic organisms in that they:

A) have photosynthetic pigments. B) develop from embryos. C) are green. D) are eukaryotic.

Biology & Microbiology