1 Bio 181 Final Exam Version 1 Newest 2025/2026 Complete All Questions And Correct Detailed Answers (Verified Answers) |Already Graded A+||Brand New Version!!
Which of the following organelles are surrounded by a double- membrane envelope?
- a nucleolus
- a lysosome
- a Golgi apparatus
- a nucleus
- a ribosome
- a mitochondrion
- a chloroplast - ANSWER-D F G
The rough ER is the portion of the ER that ______.
- is the site of steroid synthesis
- has ribosomes attached to it.
- lacks ribosomes
- is the oldest and was once the smooth ER.
- is the oldest and was once the smooth ER. - ANSWER-B 1 / 4
2
What do ribosomes and spliceosomes have in common beyond the fact that they are both essential for gene expression? - ANSWER-Besides gene expression, ribosomes and spliceosomes are both comprised of RNA and proteins. Both are responsible for carrying mRNA
What can you infer about a high molecular weight protein that cannot be transported into the nucleus?
- It doesn't bind to RNA
- It is too large
- It lacks a nuclear localization signal (NLS)
- It contains errors in its amino acid sequence - ANSWER-C
Which of the following is a mischaracterization of mitochondrial DNA?
- Mitochondrial DNA is similar in organization, but not in complexity,
- Mitochondrial DNA is organized into multiple linear chromosomes
- Mitochondrial DNA is an evolutionary relic
- Mitochondrial DNA carry very few genes that are, nonetheless,
- Mitochondrial DNA is transcribed by a mitochondrial RNA
- / 4
to that of the bacterial DNA
absolutely essential for cellular respiration
polymerases and the mRNA is translated by ribosomes which are smaller than the cytoplasmic ribosomes - ANSWER-B
3 Which of the following regarding the cell in the previous question is true?
- The cell is probably motile (can swim).
- The cell is prokaryotic
- The cell is likely to be colorless
- The cell is most likely to be heterotrophic
- One can find only 80S ribosomes in this cell - ANSWER-A
Which of the following investigators was/were responsible for the following discovery?Chemicals from heat-killed S cells were purified. The chemicals were tested for the ability to transform live R cells. The transforming agent was found to be DNA.
- Erwin Chargaff
- Alfred Hershey and Martha Chase
- Frederick Griffith
- Matthew Meselson and Franklin Stahl
- Oswald Avery, Maclyn McCarty, and Colin MacLeod - ANSWER-E
The adenine content in the DNA of Examus secundum, the bacterium which is the leading cause of mid-term exema among students and their professors, is 38.3 percent. What is the cytosine content in the DNA of 3 / 4
4
- secundum? Give your answer in percent (no units please) rounded to
the first decimal point - ANSWER-11.7
The elongation of the leading strand during DNA synthesis:
- occurs in the 3' → 5' direction.
- produces Okazaki fragments.
- does not require a template strand.
- depends on the action of DNA polymerase
- progresses away from the replication fork - ANSWER-D
Which of the following contribute to the stability of the DNA double helix?
- ionic bonds between the two strands
- hydrogen bonds between the two strands
- covalent bonds between the two strands
- Base stacking
- Super helical structures - ANSWER-B D
As we discussed in class we can use PCR to study ancient DNA. For example (discussed p 376 of your textbook), amplification and sequencing of 30,000-year-old Neanderthal DNA allowed us to learn that about the possiblity that Neanderthals and modern humans interbred. Let's take a closer look at this early work with ancient DNA
- / 4