An orchid benefits by growing on a tree trunk and the tree is unaffected by the orchid's presence. What is this type of reterm describes this relationship?
a. mutualism
b. commensalism
c. predation
d. symbiosis
e. herbivory
b
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Active -galactosidase enzyme is observed only in E. coli growing in the presence of lactose. One hypothesis is that the enzyme is always being produced, but is produced in an unstable form that breaks down rapidly in the absence of lactose (hypothesis 1)
A second hypothesis is that the enzyme is stable, but is produced only in the presence of lactose (hypothesis 2). An experiment was performed to test these hypotheses. A culture of growing cells was exposed to lactose, which was later removed. The amount of -galactosidase present in the culture during the course of the experiment was measured. The data are shown in the graph below. Which one of the following statements is a conclusion that can be obtained from these experimental data? A. The amount of -galactosidase in the culture decreased rapidly after lactose was removed, in support of hypothesis 2. B. The amount of -galactosidase in the culture decreased rapidly after lactose was removed, in support of hypothesis 1. C. The amount of -galactosidase in the culture remained stable after lactose was removed, in support of hypothesis 1. D. Synthesis of -galactosidase is turned on when lactose is added and turned off when lactose is removed, in support of hypothesis 2. E. Synthesis of -galactosidase is turned on when lactose is added and turned off when lactose is removed, in support of hypothesis 1.
The largest fraction of saltwater is that which is frozen at the Earth's polar regions.
Answer the following statement true (T) or false (F)
All of the following events occur during prometaphase EXCEPT:a
the nuclear envelope breaks down. b. the nucleoli disappear. c. the mitotic spindle is completely assembled. d. the spindle fibers "capture" chromosomes. e. the duplicated chromosomes become visible with the light microscope
What example of homeostasis includes the maintenance of constant internal body temperature?
What will be an ideal response?