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.