Water has many unique properties due to the bonds between the water molecules. Which type of bond is found between individual water molecules?
a. covalent
b. ionic
c. hydrogen
d. van der Waals interactions
c. hydrogen
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Which of the following factors likely contributed to the accumulation of O2 within Earth's atmosphere?
A. the evolution of cyanobacteria B. the fact that oxygen is also cycled during the carbon cycle C. the fact that there is a slight "de-coupling" between photosynthesis and respiration D. the fact that photosynthesis releases O2 as a product E. All of these answer options are correct.
Scaffold proteins organize groups of intracellular signaling kinases into signaling complexes
__________________ Indicate whether the statement is true or false.
Some tumor-causing mutations increase the activity or number of molecules that stimulate cell division. Genes in which such mutations occur are called _______.
A. chromatids B. cancer genes C. metastastatic genes D. proto-oncogenes E. neoplasmic genes
Which four elements make up 96 percent of matter found in living organisms?
A) sulfur, hydrogen, oxygen, nitrogen B) carbon, sulfur, nitrogen, iron C) hydrogen, carbon, oxygen, nitrogen D) hydrogen, carbon, oxygen, sulfur