Your measurement is NOT a number K BARRETTO FOR BIOL101 LAB ACTIVITIES FROM

Your measurement is not a number k barretto for

This preview shows page 15 - 25 out of 29 pages.

behavior, etc. Your measurement is NOT a number K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 15

Subscribe to view the full document.

STARCH Starch is a type of carbohydrate Carbo- : Carbons -hydrate : Hydrogens What types of food are considered “starchy”? Energy storage molecule produced in plants and an important food source for animals (including humans) K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 16
IODINE SOLUTION Iodine can be mixed with another chemical and used to kill germs It also is used in bacterial staining and testing Iodine changes color when it touches starch Used as a “starch indicator” Testing for the presence of the starch molecule K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 17

Subscribe to view the full document.

POSITIVE CONTROL Example K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018 Use starch solution as positive control Positive control is somethin g you know is there Testing for presence of starch
Image of page 18
NEGATIVE CONTROL Example K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018 Use deionize d water as negative control Negativ e control is somethin g you know is not there Testing for presence of starch
Image of page 19

Subscribe to view the full document.

CONFOUNDIN G VARIABLE Something that is related to both the independent and dependent variable. You have no control over this, but could have played a role in the results. Especially challenging in human studies! K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 20
PROCEDURE 1. Add one drop of iodine directly to each sample being tested Perform controls first! 2. Record results in your notebook Name of sample Color of iodine originally Color of iodine after being added Starch present or not present? Be careful with iodine! It stains clothes and skin. K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 21

Subscribe to view the full document.

ACTIVITY 3: TESTING FOR VITAMIN C MOLECULES IN JUICES K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 22
VITAMIN C Vitamins are required in small amounts in the diet They are used in chemical reactions and processes in the body Essential nutrient (meaning we need it but cannot make it ourselves) Collagen for bones, teeth, skin, wound healing Scurvy May be protective against heart disease and cancer (antioxidant) Water-soluble Vitamin C does not reduce the incidence, duration, or severity of colds! K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018
Image of page 23

Subscribe to view the full document.

I C C I S I VITAMIN C ASSAY C C S C C I S C C I S I K. BARRETTO FOR BIOL101 | LAB ACTIVITIES FROM DOWDY & YONENAKA 2018 Iodine likes to interact with both Vitamin C and Starch It prefers Vitamin C When there’s no more Vitamin C, it reacts
Image of page 24
Image of page 25
  • Spring '14
  • ACORE
  • K. BARRETTO, Quiz, Study guide

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes