BIOLOGY CONNECT ACCESS CARD
BIOLOGY CONNECT ACCESS CARD
12th Edition
ISBN: 9781264037452
Author: Raven
Publisher: MCG
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Chapter 4.3, Problem 3LO
Summary Introduction

To describe: The function of ribosomes in protein synthesis.

Introduction: Bacteria are prokaryotic organisms. All of them are microscopic and are unicellular. Most of the eukaryotes are multicellular, whereas some of them are unicellular. Some examples are fungi, animals, and plants. The eukaryotes contain a true nucleus where the genetic material is present and therefore they could synthesize ribosomes and proteins. 

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In chickens comb shape is controlled by a pair of interacting unlinked gene loci each with two alleles, R,r and P,p.  These genes interact in such a way to give four possible phenotypes, as follows:   Walnut - requires one each of the dominant genes. Rose -   requires a R and homozygous recessive for the p gene. Pea -    requires a P and homozygous recessive for the r gene. Single - requires fully homozygous recessive. If two walnut comb chickens are mated and produce 1,000 offspring, and some of these 1,000 offspring are of the single combed variety.  Please answer the following questions:   a.___ How many of rose comb phenotype would you expect in the 1,000 offspring?          A. 563, B. 438, C. 360, D. 188, E. 63 b.___ The evidence provided would result in the conclusion that the inheritance of comb form in chickens is a good example of a polygenic mode of inheritance.         True OR False   c.___ What would be the best way to describe the cross involved?   1. A true dihybrid cross…
Match the following: A. Intron B. Enhancer sequence C. TATA box D. 5’ cap E. Exon F.Operator G. Poly-A tail sequence H. 3’UTR   1.___ part of mature mRNA that is instrumental in binding to the ribosome 2.___ part of the coding strand promoter region where the transcription initiation complex will form 3.___Sequence found in the upstream section of eukaryotic DNA, sometimes at very great distances that can result in the increase of the initiation and therefore transcription of genes.
Match the following 1) ____Point mutation, 2)____Nonsense mutation, and 3) ____Silent mutation     A. Mutations that result in an inappropriate stop codon and a polypeptide of improper length. B. These mutations alter the DNA sequence of nucleotides but does not result in any alteration to the polypeptide produced.            C. This type of alteration of nucleic acid structure could be the result of an error in the proofreading performed by DNA polymerase. D. This type of polypeptide mutation results in one amino acid being altered but the length of the chain being the same.

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