6. which of the following statements best describes the distribution of 80S ribosomes in an eukaryotic cell?
attatched to the golgi apparatus
located in the cytoplasm and on the endoplasmic reticulum membrane
located in the nucleus
located in the endoplasmic reticulum lumen
7. The E.coli gene lacY encodes for which of the following proteins?
Beta-glactoside permease
Beta haemoglobin
Beta-galactosidase
Thiogalactoside transacetylase
8. Which of the following best describes a chemolithotropic organism?
An organism which obtains energy from the oxidation of sugars
An organism which obtains energy from the oxidation of organic chemicals
An organism which obtains energy from the oxidation of inorganic chemicals
An organism which obtains energy from light driven reactions
9. During DNA replication, Okazaki fragments are formed on
the lagging strand
neither the leading or lagging strands
the leading strand
both the leading and lagging strands
10. Which statement is correct?
polydenylation adds coding sequences to the mRNA
polydenylation occurs at the 5' end of mRNA molecule
polydenylation slows down the degradation of mRNA
polydenylation speeds up the degradation of mRNA
11. During cytoplasmic eukaryotic protein synthesis, the initiator tRNA molecule carries which of the following amino acids?
Proline
Methionine
Lysine
Tryptophan
12. Which of the following molecules are only found in bacterial cells?
Phosopholipid bilayer
Peptidoglycan
Chitin
Cellulose
13. Which of the following are not found in bacterial cells?
Golgi apparatus
Cell wall
Ribosomes
Flagella
14. Which enzyme removes short strands of RNA complimentary to the DNA sequence in DNA replication?
Primase
DNA polymerase 1
DNA polymerase 3
Helicase
15. With respect to the genes which encode mitochondrial proteins which of the following statements is true?
Mitochondrial proteins are not encoded by genes
Some genes are located in the mitochondrial DNA and some in the nuclear DNA
All genes are located in the mitochondrial DNA
All the genes are located in the nuclear DNA
16. The adaptive immune response can be activated by antigen presentation to T-helper cells by which of the following immune cells?
Cytotoxic T cells
Macrophage
Plasma cell
Mast cell
17. Which enzyme produces short strands of RNA complimentary to the DNA sequence in DNA replication?
Primase
Helicase
DNA polymerase 1
DNA polymerase 3
18. In a eukaryotic cell, which of the following statements best describes the arrangment of nuclear genes?
monocistronic
operon-based
polycistronic
multigenic
19. The transfer of electrons between the cytochrome bc-1 and cytochrome oxidase complexes of the eukaryotic electron transport chain is mediated by which of the following molecules?
Protons
Cytochrome c
Ubiquinone
Adenosine triphosphate
20. Which sequence correctly orders the evolution of the following biochemical reaction?