Essential Cell Biology (Fourth Edition)
Essential Cell Biology (Fourth Edition)
4th Edition
ISBN: 9780815345251
Author: Bruce Alberts, Dennis Bray, Karen Hopkin, Alexander D. Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter
Publisher: W. W. Norton & Company
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Chapter 15, Problem 9Q

A.

Summary Introduction

To examine: Whether the statement “Ribosomes are cytoplasmic structures that, during protein synthesis, become linked by an mRNA molecule to form polyribosomes” is correct or incorrect.

B.

Summary Introduction

To examine: Whether the statement“Theamino acid sequence Leu-His-Arg-Leu-Asp-Ala-Gln-Ser-Lys-Leu-Ser-Ser is a signal sequence that directs proteins to the ER” is correct or incorrect.

C.

Summary Introduction

To examine: Whether the statement“All transport vesicles in the cell must have a v-SNARE protein in their membrane” is correct or incorrect.

D.

Summary Introduction

To explain: Whether the statement“Transport vesicles deliver proteins and lipids to the cell surface” is correct or incorrect.

E.

Summary Introduction

To examine: Whether the statement “If the delivery of prospective lysosomal proteins from the trans Golginetwork to the late endosomes were blocked, lysososmal proteins would be secreted by the constitutive secretion pathways shown in Figure 15-30” is correct or incorrect.

F.

Summary Introduction

To examine: Whether the statement “Lysosomes digest only substances that have been taken up by cells by endocytosis” is correct or incorrect.

G.

Summary Introduction

To examine: Whether the statement“N-linked sugar chains are found on glycoproteins that face the cell surface, as well as on glycoproteins that face the lumen of the ER, trans Golgi network, and mitochondria” is correct or incorrect.

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…
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