BIOS241 Week 5 Exam 2 [Oct 2026]

BIOS241 Week 5 Exam 2 (Oct 2026)

Why does aerobic respiration produce more ATP than fermentation?

1. Both pathways produce the same amount of ATP
2. Fermentation does not oxidize glucose completely, but aerobic respiration does ✅
3. Fermentation only uses glycolysis and the Krebs cycle
4. Fermentation oxidizes glucose completely, but aerobic respiration does not

Two unknown bacterial strains were collected from different environments. Strain A was found in the human intestinal tract and grows best at 37°C. Strain B was found in deep ocean ice and grows best at 4°C. How would you classify these bacteria based on their temperature preferences?

1. Strain A is a mesophile; Strain B is a psychrophile ✅
2. Strain A is a psychrophile; Strain B is a mesophile
3. Strain A is a thermophile; Strain B is a psychrophile
4. Strain A is a mesophile; Strain B is a thermophile

A microorganism is found near the surface of a lake. It gets its carbon from carbon dioxide and gets its energy from sunlight. What classification describes this organism?

1. Chemoheterotroph
2. Photoautotroph ✅
3. Chemoautotroph
4. Photoheterotroph

The following RNA sequence AUU GAU UGG GAG GAU encodes for the amino acid sequence (Ile Asp Trp Glu Asp). Below is a list of nucleotide mutations and the changes they cause in the amino acid sequence. Match the name of the mutation to the correct nucleotide and amino acid sequence.

AUU GAU UGG GAG GAG (Ile Asp Trp Glu Glu) → Missense mutation ✅

AUU GAU UGG GAG GGA U (Ile Asp Trp Glu Gly) → Insertion mutation ✅

AUU GAU UAG (Ile Asp STOP) → Nonsense mutation ✅

AUU GAU UGG GAG AU (Ile Asp Trp Glu) → Deletion mutation ✅

A student is studying the process of cellular respiration in bacteria and notices that there are no mitochondria. However, the bacteria still produce ATP using an electron transport system (ETS). Based on this observation, where is the ETS most likely located in bacterial cells?

1. Inside ribosomes, because translating mRNA requires energy
2. In the cytoplasm, the site of glycolysis and metabolic events
3. In the cytoplasmic membrane, allowing for proton gradient formation. ✅
4. On the inner surface of the cell wall, where structural support is provided……………………………………purchase all the 32 questions at $30 only