Biology B – BioBeyond – Chemical Basis of Life | 60 Questions with 100% Correct Answers | Updated & Verified
Biology B – BioBeyond – Chemical Basis
of Life
During your explorations of previous lessons, what four types of molecules did you find that
make up the structural components of a cell? – ✔✔Carbohydrates / Lipids / Nucleic Acids /
Proteins
Shown to the right are diagrams of each of the components you identified in your exploration.
They, in turn, are made up of smaller pieces called atoms, connected by things called bonds.
Identify in the graphic below which pieces you think are atoms and which you think are bonds. –
✔✔1. Bond
- Atom
Atoms and bonds are often represented in chemical structures by balls and sticks, but like
organelles, are more complex than they are often represented. Later, you’ll learn about bonds. For
now, you’ll explore what an atom is. – ✔✔An atom is the smallest unit of ordinary matter that
forms a chemical element. It is made up of protons, neutrons, and electrons.
Which of the following would be a good definition of the atom according to Democritus? – ✔✔A
piece of something that is as small as possible
What was J. J. Thomson’s biggest difference from Democritus’ model? – ✔✔Atoms broken into
smaller pieces
Which scenario below do you think is most likely for this experiment’s results? Make a
hypothesis. – ✔✔The beam of alpha particles will pass through mostly unchanged and some will
bounce back
Why did this surprise Rutherford? – ✔✔Thomson’s model of the atom had a diffuse positive
charge, so the particles should not have been deflected very far.
How was Rutherford’s model different from his mentor, Thomson’s? – ✔✔Rutherford’s model
had a small, dense, positive nucleus.
What differences does Bohr’s model have compared to Rutherford’s? Select all that apply: –
✔✔Distinct energy levels for electrons / Distinct orbits for electrons
How is Schrödinger’s model different from Bohr’s? – ✔✔Electrons don’t have orbits but have
volumes they may occupy.
Where is most of the mass in an atom located? – ✔✔Nucleus
What makes up most of the volume of an atom? – ✔✔Empty space
Connect the name of the scientist to their contribution to the modern model of atomic structure. –
✔✔Next 6
Electrons in orbits by energy levels – ✔✔Bohr
Initial concept of nucleus – ✔✔Rutherford
Initial concept of electrons – ✔✔Thomson
Electrons in clouds – ✔✔Schrodinger
initial concept of protons and neurons – ✔✔Chadwick
Initial concept of atom – ✔✔Democritus
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