43. The R group is different for the 20 amino acids used in protein synthesis. A

Question

43. The R group is different for the 20 amino acids used in protein synthesis. A. True B. False 44. The centrosome is the microtubule organizing center. A. True B. False 45. Stem cells are immature cells that grow and divide to produce various cell es. A, True B. False 46. Glycogen is a storage polysaccharide in humans and animals. A True B. False 47. Mitochondria and chloroplasts have linear DNA. A. True False 48. Novartis is a pharmaceutical company. A True B. False 49. The nucleolus is the site of rRNA synthesis. True - B. False 50. Nonpolar and hydrophobic molecules readily diffuse through the pla membrane True B. False

Explanation / Answer

43) True

Different amino acids are distinguished by their different R groups

Amino acids have a general formula RCH(NH2)(COOH)

44) True

Centrosomes are the main microtubule organising center in animal cells.

45) True

Stem cells divide and produce cells of same type, and also differentiate into cells of different kinds.

46) True

Glycogen is the form of polysaccharide stored in animal body.

47) True.

Microchondria and chloroplasts have linear DNA

48) True

49) True

Nucleolus is the site of rRNA, mRNA and tRNA synthesis.

50)True

Nonpolar and hydrophobic molecules diffuse through plasma membrane by passive transport. It occurs following concentration gradient, and requires no energy for this transport.

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