Assignment *2.pdf ×+ 1. Which of the following enzymes catalyze the formation of
ID: 96794 • Letter: A
Question
Assignment *2.pdf ×+ 1. Which of the following enzymes catalyze the formation of new DNA strands using the parent strands as templates? a. DNA ligase b. DNA polymerase c. Replication enzyme d. Restriction enzyme osomal chromosomes are all of the chromosomes of an individual except: a. the sex determining chromosomes b. the chromosomes with no centromeres c. the chromosomes wrapped around histone d, only ½ of the total of the mother's contribution 2. Aut A single strand of DNA with the base-pairing sequence C-G-A-T-T-G is compatible only with the sequence: 3. a. C-G-A-T-T-G b. G-C-T-A-A-G c. T-A-G-C-C-T d. G-C-T-A-A-CExplanation / Answer
1. (b) DNA polymerase is a enzyme that catalyze the formation of new DNA strand using parent DNA strand. This enzyme invove in DNA replication. Restriction enzyme cut the DNA at restriction site, DNA ligase joined the two ends of DNA and there are so many replication enzyme among DNA polymerase synthesize new strand.
2. (a) Sex determined by sex chromosome not by autosomal chromosome. All other options are trure regarding autosomal chromosome.
3 (d) GCTAAC according to chargaff rule, purine pair with pyrimidine. Adenin always pair with thymin, guanin always pair with cytosine. Therefore , you can find correct pairing in the options to get an answer.
4. (b) Formation of RNA from DNA called transcription. translation means protein synthesis, replication means DNA duplication and transduction is bacterial gene transfer method.
5. (d) Ribose and U. In contrast to DNA which has deoxyribose sugar and thymin base, RNA has ribose sugar and uracil base.
6. (c) Both addition and deletion of base shift the reading frame of translation called frame shift mutation. This mutation produce nonfunctional protein.
7. (b) tRNA carries amino acid to ribosome. It attached to ribosome through codon - anticodon pairing.
8 (c) During cell division, chromosome replicate and attached to each other called sister chromatid. constricted region on chromosome called centromere, chromosome made up of DNA and protein.
9 (b) In animal, diploid organism undergoes meiosis and form gametes these gametes undergo fertilization and again form diploid organism.
10 (d) During cell division, cell undergoes 4 stages prophase, metaphase, anaphase and telophase. during metaphase all sister chromatid aligned on the middle of spindle pole.
11 (b) Anaphase is a stage in chich chromosome move towards opposite pole
12. (c) In snapdragon , due to incomplete dominance 1/4 red: 1/2 pink and 1/4 white colour produce
RR X rr R r
R RR Rr
r Rr rr
Here in heterozygous condition completely different phenotype produce other than dominant and recessive phenotype. Here RR produce red colour and rr produce white colour.
13 (d) A man with blood group A with AO genotype then has child with blood group A, AB and B depend upon the mother blood group.
14. (a) One character has dominant allele T and recessive allele t
cross between heterozygous Tt X Tt
genotype TT Tt Tt tt SO genotypic ratio is 1:2:1
15. (c) Chromosome arrangement with number is called karyotype. It is used to chech chromosomal abnormalities.
16 (b) Albinism is autosomal recessive than other disorder
18 (c) DNA fragement produced by restriction enzyme. It cut the DNA at the specific sites called restriction sites and produce DNA fragment of different size.
19. (c) Genetically identical cells is called clones produced by mitosis.
20. (a) Transgenic organism are those that carry genes from different species.