49. Which of the following is present in double-stranded cDNA but absent in the corresponding genomic DNA of eukaryotic cells?
(A) Promoter sequences
(B) A homopolymeric sequence of A:T base pairs
(C) Intron sequences
(D) 5' and 3'UTRs
(E) Exon sequences

1._______refer to the aggregates of rough endoplasmic reticulum (rER) and polysomes that confer the cytological hallmark of neurons revealed by the conventional staining. (A) Wallerian stumps (B) Cajal masses (C) Nissl bodies (D) Leeuwenhoek processes (E) Schwann recesses

2. Collections of neuronal cell bodies in the central nervous system are called: (A) Ganglia (B) Neuroglia (C) Nodes (D) Nuclei (E) White matter

3.______connect the intermediate filament system of two adjacent epithelial cells. (A) Adherent junctions (B) Desmosomes (C) Occluding junctions (D) Gap junction (E) Focal contacts

4. What will happen when you trigger an action potential at each end of a very long axon? (A) Both action potentials will continue their transmissions to their respective distal ends. (B) The action potential starts close to the soma will transmit to the other end. (C) The action potential starts far away from the soma will transmit to the other end. (D) Two action potentials will merge into one action potential that subsequently transmits to the axon terminal in a larger amplitude. (E) Two action potentials will cancel each other around the middle of this axon.

5. Diapedesis occurs at: (A) vasa vasorum (B) arteries (C) capillaries (D) postcapillary venules (E) inferior vena cava

6. Oxygen crosses a plasma membrane by (A) osmosis. (B) active transport. (C) pinocytosis. (D) passive transport. (E) receptor mediated endocytosis.

7.________helps the maintenance of membrane fluidly of animal cells in cold environments. (A) PIP2 (B) Glycerol (C) Cholesterol (D) Phospholipid (E) Fibronectin

8. Which of the following is not the derivatives of mesoderm in vertebrates? (A) Skeletal systems (B) Circulation and lymphatic systems (C) Dermis of skin (D) Adrenal cortex (E) Thymus

9. The destination of ubiquitinated proteins in cytosol is__________. (A)lysosome (B)autophagosome (C) proteosome (D) spliceosome (E) peroxisome

10. Which of the following genotypes due to nondisjunction of sex chromosomes is lethal? (A)XXX (B)OY (C) XXY (D) XO (E) None of the above

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