Page |1
ASU BIO 181 2025/2026 NEWEST ACTUAL EXAM WITH
COMPLETE QUESTIONS AND VERIFIED ANSWERS
|ALREADY GRADED A+|
For a protein to enter the endoplasmic reticulum as part of the
endoplasmic reticulum's lumen or part of the endoplasmic
reticulum's membrane:
A. The messenger RNA goes directly to the ER.
B. A ribosome binds to the mRNA and a short stretch of protein is
synthesized that contains a signal sequence.
C. Ribosomes at the endoplasmic reticulum bind to the protein
D. Is a random event and one day the protein could go to the ER
and on another day the same protein could associate with a free
polyribosome.
E. None of the above. - ANSWER-B. A ribosome binds to the
mRNA and a short stretch of protein is synthesized that contains a
signal sequence.
Explain the evolutionary origin of mitochondria. - ANSWER-
Anaerobic eukaryote engulfed an aerobic alpha-proteobacterium
, Page |2
which then became an endosymbiont providing ATP from
respiration while receiving substrates and protection
It is a simple matter (i.e., thermodynamically favorable) for a
vesicle to form from the endoplasmic reticulum. - ANSWER-
FALSE
Amino acids can be largely subdivided into two groups. What are
the two groups? - ANSWER-Hydrophilic and Hydrophobic.
The ER is contiguous with the Golgi apparatus. - ANSWER-
FALSE
What is the difference between a triglyceride and a phospholipid?
- ANSWER-Triglycerides have three fatty acids attached to the
glycerol whereas phospholipids have one of the fatty acids
replaced by a phosphate group.
What are the orphaned organelles orphaned from? - ANSWER-
Orphaned from the endomembrane system
, Page |3
When a vesicle fuses with the plasma membrane the contents of
the lumen of the vesicle are:
A. Ligands that enter the nucleus.
B. Ligands that become the part of the plasma membrane.
C. Ligands that are used in cell communication.
D. Two of the above.
E. Part of the nuclear pore complex. - ANSWER-C. Ligands that
are used in cell communication.
Draw a phospholipid and make sure the numbers of carbons are
clearly identified. - ANSWER-
Heterochromatin does not exist in interphase nuclei. - ANSWER-
FALSE
Naked DNA does not exist in Nature but scientists can make
naked DNA in a test tube. - ANSWER-TRUE
ASU BIO 181 2025/2026 NEWEST ACTUAL EXAM WITH
COMPLETE QUESTIONS AND VERIFIED ANSWERS
|ALREADY GRADED A+|
For a protein to enter the endoplasmic reticulum as part of the
endoplasmic reticulum's lumen or part of the endoplasmic
reticulum's membrane:
A. The messenger RNA goes directly to the ER.
B. A ribosome binds to the mRNA and a short stretch of protein is
synthesized that contains a signal sequence.
C. Ribosomes at the endoplasmic reticulum bind to the protein
D. Is a random event and one day the protein could go to the ER
and on another day the same protein could associate with a free
polyribosome.
E. None of the above. - ANSWER-B. A ribosome binds to the
mRNA and a short stretch of protein is synthesized that contains a
signal sequence.
Explain the evolutionary origin of mitochondria. - ANSWER-
Anaerobic eukaryote engulfed an aerobic alpha-proteobacterium
, Page |2
which then became an endosymbiont providing ATP from
respiration while receiving substrates and protection
It is a simple matter (i.e., thermodynamically favorable) for a
vesicle to form from the endoplasmic reticulum. - ANSWER-
FALSE
Amino acids can be largely subdivided into two groups. What are
the two groups? - ANSWER-Hydrophilic and Hydrophobic.
The ER is contiguous with the Golgi apparatus. - ANSWER-
FALSE
What is the difference between a triglyceride and a phospholipid?
- ANSWER-Triglycerides have three fatty acids attached to the
glycerol whereas phospholipids have one of the fatty acids
replaced by a phosphate group.
What are the orphaned organelles orphaned from? - ANSWER-
Orphaned from the endomembrane system
, Page |3
When a vesicle fuses with the plasma membrane the contents of
the lumen of the vesicle are:
A. Ligands that enter the nucleus.
B. Ligands that become the part of the plasma membrane.
C. Ligands that are used in cell communication.
D. Two of the above.
E. Part of the nuclear pore complex. - ANSWER-C. Ligands that
are used in cell communication.
Draw a phospholipid and make sure the numbers of carbons are
clearly identified. - ANSWER-
Heterochromatin does not exist in interphase nuclei. - ANSWER-
FALSE
Naked DNA does not exist in Nature but scientists can make
naked DNA in a test tube. - ANSWER-TRUE
