Mock Test-Scholarship Test (Life Sciences) True Scientist-Scholarship-Mock Test 1 / 10 Which of the following processes involves the synthesis of mRNA from a DNA template? Translation Replication Transcription Transposition 2 / 10 What is the primary function of DNA polymerase during DNA replication? Synthesizing RNA Unwinding the DNA double helix Adding nucleotides to the growing DNA strand Joining Okazaki fragments 3 / 10 What is the role of ribosomes in the cell? DNA replication Protein synthesis Lipid synthesis Cellular respiration 4 / 10 Which of the following structures is responsible for the proofreading function during DNA replication? RNA polymerase DNA ligase DNA polymerase Helicase 5 / 10 Which of the following regulatory proteins can act as a positive and negative regulator on binding to the same DNA elements? Lac repressor (LacI) Lambda (cI) repressor Ara C protein (AraC) Trp repressor (TrpR) 6 / 10 Which statement accurately describes the role of histone acetylation in gene expression? Histone acetylation typically leads to chromatin condensation and transcriptional repression. Histone acetylation results in the removal of acetyl groups from histones, leading to gene activation. Histone acetylation neutralizes the positive charges on histones, reducing their affinity for DNA and leading to transcriptional activation. Histone acetylation causes the addition of methyl groups to histones, leading to gene silencing. 7 / 10 Which of the following proteins is involved in the positive regulation of the lac operon by binding to the CAP site in the presence of cAMP? Lac repressor (LacI) CAP protein (Catabolite Activator Protein) LacI with cAMP AraC protein 8 / 10 How does the genome of a replication-competent retrovirus differ from that of a replication-defective retrovirus? Replication-competent retroviruses lack essential genes required for viral replication. Replication-defective retroviruses lack viral genes but can be complemented by co-infection with a helper virus. Replication-competent retroviruses do not integrate into the host genome. Replication-defective retroviruses have a full set of viral genes but cannot produce infectious particles. 9 / 10 Which of the following transcription factors can function both as an activator and a repressor depending on the cellular context? NF-κB p53 Oct4 CREB 10 / 10 In what respect does the genome of slow-acting retroviruses differ from those of transducing viruses? They cannot activate nearby cellular proto-oncogenes after integration into the genome of the host cell They lack an oncogene They exclude mouse mammary tumor viruses They have acquired mutations during acquisition of an oncogene Your score isThe average score is 74% 0% Restart quiz
