Medgar E ollege - Department or Biot ogy Course Name: Microbiology BIO 211 Mid S

Question

Medgar E ollege - Department or Biot ogy Course Name: Microbiology BIO 211 Mid Semester Examination ank. Cboose the answers may be urue statemernts, but do not snrer one seantron bubble for each question If you feel a question or Write yeer NAME on the seantron as indicated and iD NUMBER in the-dentification sumber. bi as the question. Make nare that you Gll in me to elarity during the examination Answer ALL questions . GenesB. pro A. DNA B. proteins. of E. lipidsrotchromatids D, carbohydrates. C. chromatids D 2. IF DNA is likened to a ladder, what A phosphates and bases B. phosphates and sugars E. bases and sugars are the compounds that make up the sides of the ladder? C. bases only D. phosphates only 3. DNA is packed around A. proteins called B bistones. C. chromatin. D. protein E. nucleosomes. 4. Pairs of chromosomes tha t are similar in size and genetic A chromatids. B. diploid. C haploid. D, chromatia. E. homologous chromosomes. 5. What is the sugar molecule found in DNA? A. ribose B. phosphatase C deoxyribose D. carbohydrate E. polymerase 6. DNA A occurs in the cytoplasm of the cell. B. does not require proteins. D. is constantly happening in a cell. S takes place in the nucleus of the cell. 7. Which of the following is not found in DNA? A guanine B uracil C. deoxyribose D. thymine E. phosphate Match the following examples. A. Mitosis B. Meiosis C. Both 8. Produces genetically identical daughter cells 9. Occurs in somatic cells A 10. Gives rise to gametes 11. Generally produces 4 daughter cells 12. Requires chromosome replication must be completed be Ribosomes C. Match the following examples with the c Golgi apparatus D. Smooth endoplasmic reticulum 13. The genetic orrect ce llular organelle. A, Nucleus B Mitochondria l is stored here. are made by these. 16. Lipids and phospholipids are produced here 17. Modification of proteins takes place C 15. These store ATP

Explanation / Answer

Ans 1) Genes are composed of (a) DNA. The DNA is the hereditary unit of life and the genes are present within the DNA sequence. The genes encodes for proteins or hormones or enzymes.

Ans 2) If DNA is likened to a ladder, what are the compounds that make up the sides of the ladder – (b) Phosphates and sugars. The sugar and phosphate are the backbone that makes the side of the ladder whereas the ladder is the nucleotides.

Ans 3) (b) Histones – The protein helps in wrapping the DNA and making it compact to ultimately form the chromosome.

Ans 4) (e) Homologous chromosome – The chromosome are similar in structure and has the same gene on same position in the chromosome.

Ans 5) c)Deoxyribose – It is different from the ribose group due to the absence of the hydroxyl group and it is replaced by hydrogen.

Ans 6) c) Takes place in the nucleus of the cell

Ans 7) b) Uracil – It is one of the four bases which is only present in the RNA and not DNA

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