Terima kasih atas kunjungan Anda, semoga bermanfaat. Soal olimpiade biologi SMA IBO Singapura selengkapnya dapat Anda download melalui link download di bawah ini. Identify which bacterium is Gram positive and Gram negative respectively in the Answer sheet. Two bacterial cells were cross sectioned, and Bacterium A showed a single membrane covering its cell, while Bacterium B is covered by two membranes which are separated by a narrow space containing peptidoglycan material. The fate of the cell cannot be predicted.Ĭontoh Soal Olimpiade Biologi IBO Nomor 3 :

Match the following fates of the cell with the conditions (I to IV).Ĭ. A chemical which extends the half life of Bcl-2 is added to the cell. The cell overexpresses a form of Bcl-2 that is targeted to cell membrane only. The cell has expressed a mutant form of Apaf-1 that constitutively (always) bind Bcl-2. What will be the fate of a cell exposed to reactive oxygen species in the following conditions? This complex sequentially activates many proteases that digest cellular proteins. The released cytochrome c forms a complex with Apaf-1 and caspase 9.

Reactive oxygen species cause Bcl-2 to release Apaf-1 and a third protein Bax to penetrate the mitochondrial membrane, releasing cytochrome c. The outer membrane of mitochondria normally expresses a protein Bcl-2 on its surface. One of the mechanisms is triggered by reactive oxygen species. Olimpiade Sains Nasional (OSN) secara konsisten terus dikembangkan sebagai salah satu program pembinaan olah pikir peserta didik. Setiap Provinsi diwakili minimal 1 (satu) siswa terpilih per bidang. There are various mechanisms by which a cell can commit suicide – a phenomenon known as “apoptosis”. Kumpulan Soal Olimpiade Sains Nasional Persiapan OSN SMA 2020. Olimpiade Sains Nasional (OSN) SMA Tahun 2018 1. Two of your friends carry (that is, are heterozygous for) the recessive c allele, which in homozygotes causes cystic fibrosis.Contoh Soal Olimpiade Biologi IBO Nomor 2 : What was the genotype of the black parent?Īfter graduation, you and 19 friends (sex ratio close 1:1) build a raft, sail to a deserted island, and start a new population, totally isolated from the world. Half of the offspring were albino, one quarter - black agouti, and one quarter were brown agouti. A mouse with a black agouti coat is mated with an albino mouse of genotype bbcc. At the second locus, the B allele is dominant to the b, and the B allele determines black agouti coat colour, but b - brown agouti coat colour. Mice with genotype CC or Cc are agouti, and with genotype cc-albino because pigment production in hair is blocked. Mouse hair colour is determined by two unlinked loci – C and B.

Soal soal olompiade Biologi Ambon 2018