Download Exam 2 from Spring 2013

Name ______________________________________
SFR 100 - Introduction to Forest Biology
Exam 2: 100 points March 22, 2013
For short answer questions, be brief; full sentences are not necessary. Point value for each question is in
parentheses. If a question is not clear to you, please ask for clarification.
Write your name on this page now!!!!!!
1.
(pt=3)
Photosynthesis and respiration are the key cell processes that utilize energy for life.
Which are the initial compounds in photosynthesis that are also the end product of respiration?
______________________________________________________________________________
______________________________________________________________________________
What is one common molecule that is a product of photosynthesis, stores energy, and is the initial
compound used in respiration? ______________________________________________________
2.
(pt=10)
Electrons must be transferred in photosynthesis and respiration.
In the light reactions of photosynthesis, the electrons come from the ___________________________
molecule, travel through __________________________________, and end up on ______________.
In the process of moving through the membrane, hydrogen ions are pumped into the thylakoid stroma.
Diagram the energy that this creates so that ____________ compound can be produced:
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3.
(pt=5)
What is the most common enzyme in the world? __________________
Why is this true? (2 reasons)
a)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
b)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
4.
(pt=3)
In the dark reactions, what must react first to a carbon molecule, ATP or NADPH? (circle
the correct answer). Why is this so? (one reason)
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
5.
(pt=2)
For every 6 G3P produced, only 1 can get used to synthesize all the other biological
compounds. The other 5 remain in the Calvin Cycle. Why is this so? (1 reason)
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
6.
(pt=2)
In glycolysis, which compound supplies the “P” in G3P? ____________ Which
compound initially received the “P” before breaking down to form G3P?__________________________
7.
(pt=4)
As carbon compounds get processed through stages I-III in respiration, which chemical
particles get removed from carbon? A)_______________ and B)________________
Particle A is transferred to: ______________________________________________________________
Particle B is transferred to:_________________________________________________________
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8.
(pt=10)
Electrons must be transferred in photosynthesis and respiration.
In Stage IV of respiration, the electrons come from the ___________________________ molecule, travel
through __________________________________, and end up on ______________.
In the process of moving through the membrane, hydrogen ions are pumped into the outer compartment of
the mitochondria. Diagram the energy that this creates so that ____________ compound can be
produced:
39 pts
9.
(pst=6)
A mutation occurs once in every million cell generations.
What is a mutation?_______________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
Provide 2 reasons as to why DNA replication is so reliable in preventing mutations:
a)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
b)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
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10. (pt=2)
What are the similarities in prophase between mitosis and meiosis? (sketch or describe)
11. (pt=4)
What are the differences in prophase between mitosis and meiosis? (sketch or describe)
12. (pt=3)
What is the primary difference between anaphase in mitosis and anaphase I in meiosis?
(sketch or describe)
13. (pt=2)
Meiosis must always start with a single cell have _____ set(s) of chromosomes and end up
with 4 cells having ______ set(s) of chromosomes.
57pts
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14. (pt=8) The following is a protein with 4 amino acids.
Phe – Pro – Ser – Asp
Using standard letter codes for nucleic acids, indicate the proper chemical compounds and sequence that
you would expect for this protein on:
DNA template:
DNA complementary strand:
Messenger RNA
Transfer RNA anti-codons:
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15. (pt=10)
Diagram what happens at the ribosome during protein synthesis. Label the following:
codon, anticodon, ribosome, t-RNA, m-RNA, amino acid, polypeptide, hydrogen bond, covalent bond
75pts
16. (pt=10)
Sketch a Punnett Square that starts with 1 pea plant (first parent) with white (w) flowers
and yellow (y) seeds and another pea plant (other parent) with purple flowers (P) and green seeds (G).
The parents are homozygous for each of the characters. Indicate where meiosis process must occur to
produce gametes and where fertilization of the gametes must occur.
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17. (pt=2)
For the Punnett Square in question 16, purple flowers are dominant and green seeds are
dominant. What proportion of offspring will have purple flowers? ____ out of ___. What proportion of
the offspring will have white flowers and yellow seeds? ____ out of __
18. (pt=6)
Explain how modern taxonomy of life forms is related to Natural Selection: 23 reasons)
a)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
b)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
19. (pt=3)
Why are viruses thought to have evolved from cells? (1 reasons)
a)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
b)______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
20. (pt=4)
What are 3 differences between bacteria and protists?
a)______________________________________________________________________________
______________________________________________________________________________
b)______________________________________________________________________________
______________________________________________________________________________
c)______________________________________________________________________________
______________________________________________________________________________
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