Some photosynthetic aquatic bacteria produce gas vacuoles that lack a lipid-bound membrane in order to regulate their buoyancy.
Answer the following statement true (T) or false (F)
True
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In 1880, Walther Flemming identified ________, threadlike bodies seen in dividing cells.
Fill in the blank(s) with the appropriate word(s).
What is a biofilm?
a. a movie about biology b. a slimy covering around a bacterium that allows it to stick to surfaces c. a colony of prokaryotes and eukaryotes living together in a slime d. a substance put on microscope slides that allow microscopic details to be better seen e. a shiny substance that develops above an oil slick
The fossil record is incomplete because
a. very few organisms were preserved as fossils. b. organisms tend to decay before becoming a fossil. c. animals with hard parts are preserved more easily. d. geologic processes may destroy fossils. e. all of these are true.
Heart block is a condition in which the SA node is properly functioning but the atria and ventricles are contracting out of synch. Which of the following statements explains why this happens?
A) The SA node is working extra hard to make the ventricles catch up. B) The AV node is not sending signals to the ventricles as it should. C) The coronary arteries are not delivering blood to the heart. D) The heart valves are allowing blood to flow backward through the heart.