Definition of biochemistry - Answer chemistry of life; how properties of organisms relate to their molecules
What are the 3 things biochemists study? - Answer 1. The relationship between structure and function of biomolecules
2. Chemical reactions of organisms (metabolism)
3. Communication...
Portage Biochemistry Module 1 Exam
Questions Fully Solved.
Definition of biochemistry - Answer chemistry of life; how properties of organisms relate to their
molecules
What are the 3 things biochemists study? - Answer 1. The relationship between structure and function
of biomolecules
2. Chemical reactions of organisms (metabolism)
3. Communication within and among organisms
What are bulk elements? - Answer Elements that are abundant in living organisms
What are trace elements? - Answer Elements that are less abundant in organisms but still crucial for life
Name the bulk elements (10) - Answer H, Na, K, Ca, C, N, O, P, S, Cl
Name the trace elements (13) - Answer Mg, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, W, Se, I
What's another word for a firefly? - Answer Lightning bug
Explain the chemical reaction of lightning bugs - Answer The chemical reaction is called
bioluminescence. Proteins regulate, produce, and degrade the light-emitting compound called luciferin.
Luciferin, when acted upon by a protein, glows as bugs move. This chemical reaction is regulated by the
protein (enzyme) called luciferase.
How many naturally occurring elements exist? How many are found in living organisms and what kind of
elements? - Answer 90 naturally occurring elements, less than 30 elements are found in living
organisms.
Most of these 30 elements are smaller non-metals.
, Why are smaller elements favored for living organisms? - Answer They can form stable, covalent bonds
How are strong bonds formed? - Answer Strong bonds form by significant overlap of atoms, such as
carbon and hydrogen, permitting them to share electrons
Why is the strong bond good for living organisms? - Answer The bond that forms requires significant
energy to break it. This means the bonds can withstand mechanical and thermal pressures through the
growth of hair/skin for protection.
Do larger elements form stable covalent bonds? - Answer No
Describe the role of Iron as a larger element - Answer Iron has a critical role in hemoglobin for oxygen
transport in vertebrates.
Forms an ion capable of binding to oxygen.
Describe H and O in H2O - Answer Both H and O are found in large amounts. They are small atoms that
form strong bonds. When bonded as H2O, they form a small, polar molecule that solvates and dissolves
many compounds.
H2O makes up ___% or more of living things - Answer 70%
Some plant species are ___% water by mass - Answer 90%
What is the "medium" of life and why? - Answer Water, it is found in all cells and multicellular
organisms
What is the shape and bond angle of water? Explain its bond angle - Answer Water is shown in a BENT
structure with 104.5 degree bond angle due to the repulsion of electrons in chemical bonds.
Name the four common molecular shapes of simple compounds, their bond angles, and their common
description - Answer Linear: 180 degrees, common in CO2 and triple bonds
Trigonal Planar: 120 degrees, common with double bonds
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