The RNA World theory states that RNA preceded DNA as the primary information-storing molecule, and life on early earth consisted entirely of RNA molecules. Which of the following provides the most direct support for this theory? A B с D The ribose sugar on the RNA nucleotide contains a hydroxyl group that increases its chemical stability. RNA molecules do not usually form a complementary double helix and therefore require less biomolecular resources to synthesize. RNA molecules consist of only four nucleotides, making their synthesis and replication relatively simple. The chemical versatility of RNA molecules allows them to store information as well as to fold into different functional shapes.

The RNA World theory states that RNA preceded DNA as the primary information-storing molecule, and life on early earth consisted entirely of RNA molecules. Which of the following provides the most direct support for this theory? A B с D The ribose sugar on the RNA nucleotide contains a hydroxyl group that increases its chemical stability. RNA molecules do not usually form a complementary double helix and therefore require less biomolecular resources to synthesize. RNA molecules consist of only four nucleotides, making their synthesis and replication relatively simple. The chemical versatility of RNA molecules allows them to store information as well as to fold into different functional shapes.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter9: Gene Expression And Gene Regulation

Section: Chapter Questions

Problem 19QP: Below is the structure of glycine. Draw a tripeptide composed exclusively of glycine. Label the...

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Which one of the following statements about nucleic acids is correct? Multiple Choice NTPs can be incorporated into either DNA or RNA molecules, but dNTPs can only be incorporated into DNA molecules A nitrogenous base, 5-carbon sugar, and two phosphate groups would most accurately be referred to as a nucleotide diphosphate. During nucleic acid synthesis, the phosphate group at the 3' carbon of the incoming monomer is covalently linked to the hydroxyl group at the 5' carbon of the existing macromolecule. RNA and DNA have all the same pyrimidine bases in them, but differ in the selection of purine bases. A nucleic acid found in a cell with the sequence GCCTTATCGCG would most likely be found paired with another molecule in double-stranded form.
The RNA molecules are said to be less stable than DNA molecules because aside from the shorter length of RNA molecules, their vicinal ______ group not found in DNA can make the phosphodiester bonds of RNA susceptible to hydrolysis. 3'OH 4'OH 2'OH 5'OH
Which of the following linkages/bonds is NOT found in the primary structure of DNA and RNA molecules? A phospho anhydride bond B phosphoester bond (c) N-C glycosidic bond phosphodiester bond
Which of the following combinations is nucleotide molecule? The nitrogenous base uracil bonded to ribose and phosphate complemented with the addition of a water molecule A nucleoside resulting from the dehydration reaction between two phosphates, glycerol, and an unsaturated fatty acid. The DNA backbone consisting of three phosphate groups, a 5-carbon nitrogenous base, and a nitrogen-containing sugar residue An ATP molecule is formed by combining adenine, ribose, and three inorganic phosphate groups
RNA and DNA have the following characteristic in common. Both use the same four nitrogenous bases. None of the other answers are correct. Both commonly form double-stranded molecules in the cell. Both contain a sugar-phosphate backbone in their chains of nucleotides. Both use 2-deoxyribose sugars in their nucleotides.
Suppose an alien life form has RNA just like human RNA – except that the alien RNA is made from arabinose instead of ribose. (All other ingredients remain the same.) Draw the structure of a nucleotide containing uracil from which the alien RNA would be assembled. Note: be sure to draw the molecule as it would exist at physiological pH. Click and drag to start drawing a structure. to
Below is the structure of glycine. Draw a tripeptide composed exclusively of glycine. Label the N-terminus and C-terminus. Draw a box around the peptide bonds.
The enzyme thermolysin cleaves peptide bonds on the C-terminal side of the amino acids lle, Tyr, Phe, and Trp. If thermolysin acts on the sequence below: QRYKKSHTWDPNRKLFNRYLCMA which of the figures below shows the structure of the N-terminal residue of the longest fragment? NH3 HO, NH2 HOʻ NH3 NH `NH3 CH3 0 H3C° NH3
To build a nucleotide, let's first consider the nitrogenous bases. A pyrimidine has one six-membered ring of carbon and nitrogen atoms. The members of the pyrimidine family are cytosine (C), thymine (T), and adenine (A). O TRUE O FALSE
The structure of an alpha helix orients the oxygens of the carbonyl group of the peptide bond towards the C-terminal end of the helix while the hydrogens of the NH groups orient toward the N-terminal end, thus imparting a dipole along the length of the helix. As a result, which kinds of amino acids would favor the C-terminal end, and which would favor the N-terminal end? negatively charged, positively charged positively charged, negatively charged negatively charged, hydrophobic positively charged, hydrophobic hydrophobic, negatively charged hydrophobic, positively charged
In the early days of molecular biology, some researchers speculated that RNA, but not DNA, might have a branched rather than linear covalent structure. Why might this speculation have come about?
Suppose that there is a protein consisting of two polypeptide chains with the given sequences in the picture. What will be the expected result if a biochemist does an end-group analysis to identify the N and C terminal residues of the protein? Explain why.