Cell Biology Study guides, Class notes & Summaries

Cell Theory a. all organisms are composed of cells b. the cell is the basic unit of life c. cells arise from pre-existing cells Unicellular organism with 1 cell (uni = 1) Multicellular organism with multiple specialized groups of cells Prokaryote no membrane-bound organelles (no nucleus)

Ribosomes structure-small made up of 2 sub-units protein and RNA -large ribosomes found it eukaryotic cells - smaller ribosomes found in prokaryotic cells, mitochondria and chloroplast. Ribosomes functionsite of protein synthesis cell-surface membraneall the molecules in the membrane arranged with the phospholipids bilayer create the partially permeable membrane components of membranesphospholipids, bilayer

Theory of EndosymbiosisEukaryotic cells emerged when mitochondria and chloroplasts, once free-living prokaryotes, took up permanent residence inside other larger cells, about 1.5 billion years ago. Eukaryotic CellA type of cell with a membrane-enclosed nucleus and membraneenclosed organelles. Organisms with eukaryotic cells (protists, plants, fungi, and animals) are called eukaryotes. Prokaryotic CellA type of cell lacking a membrane-enclosed nucleus and membraneenclosed organelles; fo...

Cell Biology Final Dr. Dudley Huntingdon College Questions And Answers

1) Gross anatomy, or macroscopic anatomy, considers: A) internal features of the body. B) features visible with the naked, or unaided, eye. C) a study of a system of the body. D) None of the above Answer: B 2) The human form shown upright, hands at the sides, palms forward, and feet together is in the position. A) anatomical B) physiological C) prone D) supine Answer: A 3) A person lying face down is in the position. A) physiological B) prone C) anatomical D) supine Answer: B ...

MULTIPLE CHOICE 1. A student is observing a cell under the microscope. It is observed to have supercoiled DNA with histones. Which of the following would also be observed by the student? a. A single circular chromosome b. A nucleus c. Free-floating nuclear material d. No organelles ANS: B The cell described is a eukaryotic cell, so it has histones and a supercoiled DNA within its nucleus; thus, the nucleus should be observed. A single circular chromosome is characteristic of prokaryo...

e upper respiratory tract differs from the lower respiratory tract in what way? A) air is taken in through the lower respiratory tract, and CO2/O2 are exchanged in the upper respiratory tract b) air is taken in through the upper respiratory tract, and CO2/O2 are exchanged in the lower respiratory tract c) CO2 is removed from circulation in the upper respiratory tract d) O2 is removed from circulation in the lower respiratory tract - B. Air is taken in through the upper respiratory tract, ...

694496 Quiz 4 Part 1 of 6 - Chapter 6 24.0 Points Question 1 of 33 3.0 Points What is the phase that not all cells enter, but is a phase where cells are not actively dividing? A. G1 B. S C. G0 D. G2 Feedback: Great job. Question 2 of 33 3.0 Points During which stage in interphase does DNA synthesis occur? A. G2 phase B. Mitosis C. G1 phase D. S phase Feedback: Great job. Question 3 of 33 3.0...

ACELLULAR LIFE – BIOLOGY Exam (2024) || Questions & 100% Correct Answers Who discovered the existence of viruses and when? - ANSWER - Charles Chamberland worked with Louis Pasteur to discover viruses in 1884 How did Charles Chamberland discover viruses? - ANSWER - He found that the causative agents of rabies could pass through the porcelain filter with pores of 100-1000 nm. This filter had been used to remove bacteria previously. What did Iwanosky do in 1892? - ANSWER - He extracted...

Acellular Infectious Agents Exam (2024)- Questions & 100% Correct Answers Acellular Infectious Agents - ANSWER - viruses viroids prions Viruses - ANSWER - most common microbe in the world genetic element with either DNA or RNA, but not both (except for mimivirus and cytomegalovirus) obligate requirement to replicate inside a living cell has an extracellular state (virion) life forms but not cell-based Mimivirus & Cytomegalovirus - ANSWER - large viruses have both DNA & RNA Vas...