An average person has approximately ___
liters of blood in their bodies.
a. 1.5
b. 2.5
c. 3.5
d. 4.5
e. 5.5
D
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Explain how both biochemical oxygen demand and chemical oxygen demand are measured
What will be an ideal response?
Which of the following is an example of an energy-requiring reaction?
a. The combustion of the gas in your car to move it forward. b. The burning of a log to generate heat. c. The synthesis of carbon dioxide into glucose.
d. The oxidation of metal to form rust. e. The metabolism of glucose to form ATP.
While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth
The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belonged to a(n) _____. A) echinoderm B) mollusc C) nematode D) arthropod
A number of different genes have been identified as affecting skin color and there are probably more as yet unidentified. Each of these genes likely has several regulatory protein factors affecting their expression, and those proteins are coded for by
yet more genes. Thus there are many genes, some of which have multiple alleles, involved in determining skin color. What property of skin color does this multigene foundation not explain? A) Some people tan easily and some get sunburned rather than becoming tan. B) Some people have very dark skin, some have very light skin, and there is nearly continuous variation in between. C) There is variation in the amount of vitamin D humans need. D) Skin color can be acted on by natural selection.