Question

1

Under anaerobic conditions, the Krebs cycle degrades acetyl CoA to carbon dioxide and H₂O

Group of answer choices

True

False

2

Define a membrane protein that is singlepass.

3

Which of the following is incorrect regarding respiration?

Group of answer choices

ATP is required to initiate glycolysis

glucose is moved through the outer membrane of the mitochondria through a porin, forming pyruvate

Krebs cycle enzymes are located within the matrix

ETS utilizes cytochromes set up as enzyme complexes within the cristae

4

Which of the following is true regarding photosynthesis:      

Group of answer choices

carbon dioxide is added to ribulose bisphosphate (RuBP) by rubisco to produce sugars in the Calvin cycle

most of the oxygen you inhale is required for the Calvin cycle in the dark reaction

the splitting of water provides a source of electrons, but the hydrogens exit the plant through stomata

both chlorophyll a/b are pigments located in the stroma for capture of photons

5

The carbon assimilation (Calvin cycle) stage of photosynthesis requires:

Group of answer choices

ATP, NADPH and CO2

ATP, NAD, and hydrogen

ATP, NADPH, and oxygen

ATP, hydrogen, and oxygen

6

Which of the following would you expect to find predominating in the plasma membrane of a unicellular eukaryotic organism thriving in glacier ice?

Group of answer choices

20 carbon long fatty acids with 1 double bond

16 carbon long fatty acids with 3 double bonds

20 carbon long saturated fatty acids

18 carbon long fatty acids with 1 double bond

Answer 1

1. FALSE, Krebs cycle is a cyclic pathway which includes the series of interlinked chemical reactions in aerobic organisms to release energy. acetyl-CoA is oxidised to form carbondioxide and water to release stored energy.
2. Single-pass transmembrane proteins have a single transmembrane domain, which mean they cross the plasma membrane single time. such membrane proteins are involved in signalling either as ligand, enzyme adaptors, or receptors.
3. following option is  incorrect: pyruvate (3-Carbon) is formed in the cytoplasm by the process called glycolysis. in eukaryotes, the pyruvates are transported to the mytochondrial matrix for oxidation.
4. the correct statement is: the five carbon acceptor molecule ribulose-1,5-biphosphate (RuBP) combines with CO₂ molecule to form a sex carbon compound. The enzyme RuBP carboxylse/ oxygenase catalyses this reaction.