Bio 250 Exam 1 (Chapter 5-) || A Verified A+ Pass.

Proteins- four things they do correct answers -building blocks for cell structures - form enzymes that catalyze chem reactions - regulate the activity of genes - enable cell to move and communicate junk dna correct answers dna that encodes for information not needed in the cell When can chromosomes be seen clearly correct answers during cell division Cell Division is the most.....need what? correct answers ...important bio. process, but you need a blueprint for daughter cells (inheritable genetic info) five types of macromolecules.... correct answers carbohydrates lipids rna dna proteins Chromosomes are made of what two macromolecules? Where are they in each phase? correct answers DNA and Protein....which has genetic info????......Everywhere in interphase. Specific in M phase Griffith in the 1920s correct answers Performed the tests on mice with diff. strains of pneumonia: 1. S-strain injected= dead 2. R- strain= alive 3. S-strain heat killed (denature)= alive 4. R-strain + heat killed S-strain= dead w/alive S-strain how.....TRANSFORMATION Transformation in context of Griffith's work correct answers one macromolecule was transferred from the heat killed S-strain.... this one must be inheritable. Avery, MacLad, and McCarty- 1930s correct answers Fractionated cell-free content into diff classes of macromolecules. Found that only the S-strain and the R-strain DNA underwent transformation, leaving you with the lethal S-strain..... DNA=heritable info???.....still people were skeptical (too simple? contaminant? mutagen? Hershey + Chase 1950's correct answers testing with a virus that infects and kills bacteria. The virus contains just protein and DNA so you can label each separately with what each one lacks (DNA lacks sulfur= use 32P; Protein lacks phosphorus= use 35S). They let infection happen, spliced off the virus head with the bacteria, and found only the DNA pellets.