Question

13. Which of the following statements is incorrect regarding transport proteins?

a. They are required to transport ions across cell membranes.

b. They serve to carry non-polar molecules across the cell membrane.

\(c_{1}\) - They are required to transport amino acids across cell membranes.

d. They are not required to transport steroids across cell membranes.

e. They are present in cell membranes.

14. What is not an example of a neurotransmitter?

a. Acetylcholine

b. Noradrenalin

c. Serotonin

d. Dopamine

e. Cytosine

15. How many transmembrane sections are there in a G-protein coupled receptor?

a. 1

b. 3

c. 4

d. 5

e. 7

16. Which of the following statements is generally true regarding the chemical messengers for intracellular receptors?

a. They are hydrophilic in order to bind to zinc atoms.

b. They are hydrophilic in order to dissolve in the cell's cytoplasm.

c. They are hydrophobic in order to enter the nucleus of the cell.

d. They are hydrophobic in order to cross the cell membrane.

e. Their hydrophobic/hydrophilic properties are irrelevant to their function as chemical messengers.

17. A nucleoside consists of:

a. sugar and phosphatey

b. purine, pyrimidine and phosphate

c. purine / pyrimidine und sugar

d. nitrogenous base, sugar and pherger

e. cloverleaf shayed RNA strand

22. The synthesis of proteins according to "the central dogma of molecular genetics" would require:

a. replication then translation.

b. translation then replication.

c. replication then transcription.

d. transcription then translation.

e. none of the above

23. If a \(t\) RNA anticodon is GCA, what must have been the original base sequence in DNA, and which amino acid does this \(t\) RNA carry?

a. ACU, Threonine

b. ACG, Threonine

c. CGU, Arginine

d. GCA, Arginine

e. GCU, Alanine

Answer 1