BIOS 255 Comprehensive Exam Questions and Answers 100% Pass

BIOS 255 Comprehensive Exam Questions and Answers 100% Pass What is homeostasis? - ANSWER -maintenance of a stable internal environment with the contribution of all organ systems What are the components of a homeostatic mechanism? - ANSWER --Stimulus -Receptors -Control center -Effector -Response What is a negative feedback mechanism? - ANSWER -Body REVERSES, or goes against, an original stimulus to return to homeostasis Example: Blood glucose regulation after eating. What is a positive feedback mechanism? - ANSWER -Amplifies the change from the normal level. (Agrees with the change) Example: Childbirth, blood clotting What feedback mechanism is most common? - ANSWER -negative Inferior - ANSWER -Below; at a lower level Superior - ANSWER -Above; higher level Lateral - ANSWER -Side; Away from the midline of the body 2 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. Proximal - ANSWER -Closer to the point of attachment Distal - ANSWER -Father away from the point of attachment Medial - ANSWER -Toward the midline of the body Sagittal - ANSWER -divides body into left and right Transverse - ANSWER -Divides body into upper and lower parts Anterior - ANSWER -toward the front of the body Posterior - ANSWER -toward the back of the body Frontal plane - ANSWER -Divides the body into anterior (front) and posterior (back) portions. Which part of the atom is involved in chemical reactions? - ANSWER -Electrons Which part of the atom makes up the atomic number? - ANSWER -Protons pH scale - ANSWER -Measurement of hydrogen ion concentration - pH 7: Acidic -pH 7: Alkaline (basic) -pH = 7: neutral What is the main function on rough endoplasmic reticulum? - ANSWER -Protein synthesis What kind of cell division results in a diploid, increasing the number of cells? - ANSWER -Mitosis How many pairs of chromosomes do humans have? - ANSWER -23 pairs What kind of cell division results in a haploid? - ANSWER -Meiosis Meiosis I - ANSWER -Splits genetic material in half, producing a diploid 3 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. Meiosis II - ANSWER -Separates sister chromatids -four haploid daughter cells -develop into egg or sperm Prophase - ANSWER -Chromosomes become visible, nuclear envelope dissolves, spindle forms Metaphase - ANSWER -Chromosomes line up in the middle of the cell Anaphase - ANSWER -Chromosomes separate and move to opposite ends of the cell Telophase - ANSWER -Chromosomes move to opposite ends of the cell and two nuclei are formed. What are the 4 types of tissues? - ANSWER -epithelial, connective, muscle, nervous What are the properties of epithelial tissue? - ANSWER --Cells sit on basement membrane -Has apical surface and basal surface