Credit test 1 biology - variant A question done correctly 2023/2024

With increasing magnification of the objective (complete with "increase" or "decrease") a) Visual field: b) Total magnification: c) Free working distance: d) Details of objective: - answers (a) Visual field decreases b) Total magnification increases c) Free working distance decreases d) Details of objective increase What belongs to the optical part of a microscope? a) Eyepiece (ocular) b) Condenser c) Base d) Objectives e) Filters f) Mirror – answers (a) Eyepiece (ocular) d. Objectives What is the resolution of a light microscope? a) 0.2 mm b) 2 µm c) 0.2 µm d) 2 mm – answers(c) 0.2 µm What is the actual length of an object (specimen) measuring 10 units of the eyepiece micrometer (scale in ocular) when using the 10x magnifying objective? a) 100 mm b) 100 µm c) 10 µm d) 10 mm – answers(b). 100 µm What is the typical shape of the nucleus in a protozoan spirostomum? a) Round b) Lobular c) Bead-shaped d) S-shaped e) Bean-like shaped – answers(c) Bead-shaped Where are the mitochondria located in the cell? a) Just next to the endoplasmic reticulum b) Everywhere in the cytoplasm c) Just under the cell membrane d) In the nucleus – answers (b) everywhere in the cytoplasm Draw and describe a sarcomere. - Answers In which order are the solutions used in gram-staining to differentiate bacteria? a) Ethanol b) Lugol solution c) Crystal violet d) Carbolfuchsin – answers c, b, a, d What is the principle of Heller's test? a) Staining of starch with Lugol's solution b) Denaturation of proteins with nitric acid (HNO3) c) Staining of DNA in the cell nucleus with methyl-green dye – answers b. Denaturation of proteins with nitric acid (HNO3) Red blood cells in birds are: a) Oval b) With nucleus c) Round d) Without nucleus e) Bigger than in mammals f) Smaller than in mammals – answers a. Oval b. with nucleus e. Bigger than in mammals Animal cells in a hypertonic solution: a) Will shrink b) Will break c) This action is called plasmolysis d) This action is called plasmoptysis e) This action is called plasmorhisis – answers (a) will shrink e. This action is called plasmorhisis Name, the correct order, the phases of the mitosis. - answers1) Interphase 2) Prophase 3) Prometaphase 4) Metaphase 5) Anaphase 6) Cytokinesis