Question
3) Which of the following is NOT true about endospores? Al Spores are resistant to heat, radiation, cold, and dessication 8) One endospore germinates into one vegetative cell. C) They are a method of reproduction for bacteriaà ceis when wrowth cenditions are inhospitable. D) Endespores are clinicaly significant in causimg disease. E) The endospore has a thick spore coat that protects it 2) Which of the following organelles is responsible for producine vesicles such as lysosomes and) peroxisomes? A smooth endoplasmic reticulum B) nucleus C) tysosome D) Golgi body E) mitochondrion 3) Which of the follaowing is NOT a characteristic of viruses 3) A they are visible with a light microscope. 8) they are composed of genetic material and protein. C) they are obligatory parasites they are generally smaller than prokaryotic celis. they are acellular. E) If you were trying to visualize living organisms without staining, which type of microscopy would be best to utWze? A) brightfield B) TEM C) fluorescent D) confocal E) phase contrast A bacterial cell moving toward ight would be an example of A) negative chemotaxis B) negative phototaxis. C) positive chemotaxis. D) positive phototaxis. 5) 6) Short, hairlike structures covering the surface of the cell used only by eukaryotic cells for movement are called Al pseudopodia. B) fimbriae. C) ciia. D) pili. E) flagella.
Explanation / Answer
1. d. The Endopsores are dormant stage which can be converted to vegetative state. So the spores are not significantly responsible for disease.
2. e. In humans, new peroxisomes are formed by the fusion of vesicles released by the endoplasmic reticulum with vesicles released by mitochondria.
3. e. Viruses are non cellular micro organisms which are made up of genetic materials and proteins that can invade cells.
5. e. A bacterial cell moving towards light is an example of positive phototaxis.
6. e. Eukaryotic cells covered by small hair like structure called as Cilia.
7. Viroids lack protective capsid and their RNA sequence doesnot encode for any proteins.
