On the outer surface of the plasma membrane there are marker molecules that identify the cell type. Often these molecules are
A. amino acids.
B. carbohydrate chains.
C. nucleotides.
D. ATP.
E. inorganic ions.
Answer: B
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There are greenhouse gases other than CO2, including methane (CH4) and nitrous oxide (N2O), which have potential to influence changes in Earth's climate
Compare the graphs shown below measuring CO2 levels and N2O levels in the atmosphere between 1978 and 2010. CO2 plays a role in the carbon cycle, whereas N2O is a product of the nitrogen cycle. The latter results primarily from agricultural practices that utilize nitrogen-based fertilizers. Because N2O stays in the atmosphere for about 120 years before undergoing a biochemical conversion or being removed by a reservoir, the impact of one pound of N2O on the warming of Earth's atmosphere is over 300 times that of the equivalent amount of CO2 http://www.epa.gov http://www.epa.gov. Thus, it becomes important to understand atmospheric gas trends and take these results into account when making decisions about human activities detrimental to Earth's climate. Reference: Ref 25-6 While both graphs show an upward trend, N2O levels (right panel) do not oscillate annually like CO2 levels (left panel). What may account for this difference? Select all plausible choices. What will be an ideal response?
Disinfectants known as (alcohols/oxidizers/aldehydes) have the chemical group -CHO, which reacts with and damages both proteins and nucleic acids
What will be an ideal response?
Much has been written about p53 in terms of cancer biology. What is p53, and what is its significance?
What will be an ideal response?
A large boulder is balanced on top of a hill. You give the boulder a push, and it rolls down the hill. This is an example of converting _____ energy to _____ energy.
A) kinetic; thermal B) potential; kinetic C) chemical; kinetic D) kinetic; potential