Question

42. Which statement is NOT true about DNA? a) DNA acts like an enzyme by binding amino acids together using dehydration synthesis. b) Before cells divide both strands must be copied and one is provided for each new cell cm RNA is copied from a piece of DNA termed a gene. d) DNA is not always copied perfectly. Mistakes, mutations, occur and result in changed proteins, e) DNA functions as code for the synthesis of proteins. 43. A section of the mRNA has a nucleotide sequence of CUAAUGGUU. Which of the following would be the t RNA binding sequence that would be the anti-codons for this mRNA A) GTA, AUG, GUT, b) GUA UAC, AUU, C) GTU GGC, CAA, d) GAU, UAC, CAA, e) GAU, UAC, CCAA 44. The evolution of multi-cellular body plan (first demonstrated by the Porifera) probably occurred because of the evolution of specialized molecules that include: a) membrane proteins (adhering proteins) that bind the cell membranes together, b) digestive enzymes.c) hemoglobin, d) Glycogen and chitin, e) chromosomes. 45. All eukaryote single celled organisms such as the amoeba, has the Na+/K+ pump in their cell membrane. At the same time, they also have a Water portal protein that allows Na+ and K+ to move through the membrane as a result of: A) insolubility, B) hydrophobic permeability, C) the cell wall, D) active transport, E) diffusion/osmosis. 46, A section of the mRNA has a nucleotide sequence of CUATAUGUTGUU. How many codons does this segment of mRNA represent? a) two, b) three, c) four, d) one, e) none, this molecule is not a transcript of DNA. 47. The energy associated with ATP synthesis in eukaryote cells originates in the: A) mitochondrion as Oz, B) in the nucleus as a gene in the DNA, C) mitochondrion stored as glycogen molecules, D) as light absorbed by chlorophyll of a cell, E) vacuole. 48. Which of the following is most closely associated with the Calvin cycle (light independent or dark phase ) of photosynthesis? a) ATP production, b) removal of electrons from water for passage through an electron transport system, c) carbon dioxide production d) use of carbon dioxide to synthesize sugar, e) oxygen production 49. For eukaryote cells to evolve into new types of eukaryotic organism, which of the following would one expect to occur? a) All the cells have different DNA b) The endoplasmic reticulum is synthesizing different proteins. c) These Specialized cells activate new genes to synthesize new proteins. d) Cells must be getting new genetic mutations and more DNA e) all of these are true 50. Which is true of eukaryotic cells? A) A true nucleus contains the DNA in the form of chromosomes. B) Eukaryotic cells contain membrane bounded compartments or organelles. C) Their DNA is enclosed in the double membranes nuclear envelope, D) They all contain mitochondria E) A through D are correct.