II. TRUEFALSE. 5@ 2 pts cach. Please mark the appropriate bubble on the SCANTRON
ID: 253508 • Letter: I
Question
II. TRUEFALSE. 5@ 2 pts cach. Please mark the appropriate bubble on the SCANTRON sheet (17-21). TRUE = A. FALSE = B. 17) All known methanogens are in the domain Archaca 18) The bioluminescent bacteria and the headlight fish are thought to be in a mutualistic relationship 19) A heterocyst is a specialized cell in Anabaena where O2 concentrations are maintained in a microanaerobic environment. 20) During asexual reproduction in budding yeast, the bud cell will have a smaller nucleus than the parent cell 21) Euglenozoans that are mixotrophic lack functional chloroplastsExplanation / Answer
17. True.
18. True: The bioluminescent bacteria provides light source and fish provides shelter.
19. True: A heterocyst is a group of cells which fix nitrogen with the help of enzyme nitrogenase. Nitrogenase enzyme is inactivated in the presence of oxygen so the heterocyst must create a microanaerobic environment.
20. False: The bud cell size encreases during asexual reproduction. The size of the nucleus also increases and ultimately divided into two nucleus. Thus, the size of nucleus in bud cells of yeast will have same nucleus size as in parent cell in inital which increases later.
21. False: Euglenozoans feed through absorption but many eugleonozoans possess chloroplast and perform photosynthesis to obtain energy.