481. The following points about microfilamentsare true except(
A. They form cytoskeleton with microtubules
B. They provide support and shape
C. They form intracellular conducting channels
D. They are involved in muscle cell contraction
482. The following substances are cellinclusions except
A. Melanin
B. Glycogen
C. Lipids
D.Centrosome
483. Fatty acids can be transported into andout of cell membrane by
A. Active transport
B. Facilitated transport
C. Diffusion
D. Osmosis
484. Enzymes catalyzing electron transportare present mainly in the
A. Ribosomes
B. Endoplasmic reticulum
C. Lysosomes
D. Inner mitochondrial membrane
485. Mature erythrocytes do not contain
A. Glycolytic enzymes
B. HMP shunt enzymes
C. Pyridine nucleotide
D. ATP
486. In mammalian cells rRNA is producedmainly in the
A. Endoplasmic reticulum
B. Ribosome
C. Nucleolus
D. Nucleus
487. Genetic information of nuclear DNA istransmitted to the site of protein synthesisby(
A.rRNA
B. mRNA
C. tRNA
D.Polysomes
488. The power house of the cell is
A. Nucleus
B. Cell membrane
C. Mitochondria
D. Lysosomes
489. The digestive enzymes of cellularcompounds are confined to
A. Lysosomes
B. Ribosomes
C. Peroxisomes
D.Polysomes
490. Which of the following organic groups are found in naturally occuring amino acids?
A. Guanidinium ion
B. Indole
C. Imidazole
D. All of these