BIOS 255 EXAM 2 COMPREHENSIVE ASSESSMENT QUESTIONS AND VERIFIED ANSWERS GRADED A+

BIOS 255 EXAM 2 COMPREHENSIVE
ASSESSMENT QUESTIONS AND VERIFIED
ANSWERS GRADED A+

●● Gregor Mendel
Answer: Used pea planta model
-Discovered Modes of inheritance


●● TH Morgan
Answer: used drosophila model
-introduced inheritable mutation
-gene mapping
-Chromosomes were composed of DNA tightly wrapped around proteins
(histones)


●● Hershey/Chase experiment
Answer: used radioactive tags/labels to see DNA was injected by virus
into bacterium, not proteins
-Suggested DNA is the genetic material


●● Erwin Chargaffs Rule
Answer: A and T

,G and C


●● Watson/Crick/Franklin
Answer: Successfully determined Structure of DNA (spiral helicase)


●● What is the Monomer of DNA
Answer: Nucleotides


●● What are the 4 nucleotides
Answer: Adenine(DNA)
Guanine
Cytosine
Thymine
Uracil(RNA)


●● Type of Bond between 2 nucleotides
Answer: phosphodiester bond of sugars


●● What type of Bond holds Base Pairs together
Answer: Hydrogen Bonds


●● How many hydrogen bonds for A-T

, Answer: 2 Hydrogen bonds


●● How many hydrogen bonds for G-C
Answer: 3 Hydrogen bonds


●● Define Antiparallel (DNA Strands)
Answer: 2 complimentary DNA strands running opposite directions


●● What direction do DNA strands run
Answer: 5' to 3'


●● What is the structure of DNA
Answer: Twisting Double Helix


●● What are the main components of a single nucleotide
Answer: -Sugar
-Phosphate
-Nitrogenous Base (determines nucleotide)


●● What phase does DNA replication occur
Answer: S-phase