What is the likely explanation for the extinction of dinosaurs?
A. Lightning storms started massive fires.
B. The earth was suddenly flooded with water.
C. There was a severe drought.
D. A meteor struck the earth, sending clouds of soot that blocked the sunlight.
Answer: D
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What are the characteristics of angiosperms? Check all that apply.
_____ Seed production. _____ Flower production. _____ They do not produce fruit. _____ They produce embryos.
Which classification includes animals that eat only meat?
a. herbivore b. carnivore c. omnivore d. decomposer e. photosynthetic organism
During an infection, white blood cells travel to the infected site and phagocytize the pathogens. After
phagocytosis, primary lysosomes fuse with the phagocytic vesicle to form a larger vesicle called a secondary lysosome. The reason for this is: a. to introduce antibodies to the phagocytic vesicles. b. to wrap the pathogen in additional membrane, rendering them harmless. c. to coat the bacteria in lipids derived from the Golgi complex, which cover and smother them. d. to mix the pathogens with strong hydrolytic enzymes and destroy them. e. to prepare the bacteria for export from the body.
________ bacteria contain an F factor or plasmid that is capable of initiating conjugation. ________ bacteria contain an F plasmid that possesses a portion of the bacterial chromosome
A) F+; Merozygotes B) Merozygotes; F? C) F?; F+ D) F?; Hfr E) F+; Hfr