Cholesterol
a. has a rigid backbone of four carbon rings.
b. is the most common steroid in animal
tissue.
c. is a lipid without a fatty-acid component.
d. is needed to produce sexual development
and maturity.
e. is all of these.
E
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Metastatic cancer cells:
A. are able to leave the tumor where they originated and travel to distant locations to set up new tumors at distant sites. B. have lost their adhesion to the extracellular matrix, freeing them from being confined to the original tumor. C. become malignant when they cross the capillary basal lamina. D. only need to cross a single layer of capillary endothelial cells to form tumors at distant sites. E. All of these choices are correct.
Organisms that demonstrate a type I survivorship curve are characterized by:
a. death rate of the population does not vary with age b. low death rate until mid-life c. low death rate until late in life d. high death rate in early life e. high death rate in mid-life
Erasmus Darwin, Charles Darwin's grandfather, suggested the possibility of evolutionary descent in his writings.
Answer the following statement true (T) or false (F)
Lois plans to set up a freshwater aquarium. How might she add oxygen to the system for the fish to use during respiration?
A) Make sure the aquarium receives enough sunlight so that the water molecules can be split. B) Add soil and sand as bottom substrate that will release stored oxygen. C) Add plants that produce oxygen during photosynthesis. D) Add snails to the aquarium to decompose material that adds oxygen to the system.