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25 Mar 2019

please explain

1. Nuclear pores are highly selective with great specificity for molecules passing through

a. true

b. false

2. The major chemical modification on proteins for signal transmission begins with this letter:

a. U

b. A

c. P

d. M

3. An organelle involved with the enzymzatic breakdown of biomolecules:

a. Nucleus

b. Mitochondria

c. Endoplasmic reticulum

d. Plasma membrane

e. Cytosol

f. Golgi apparatus

g. Lysosome

h. Peroxisome

i. The cytoskeleton

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Lelia Lubowitz
Lelia LubowitzLv2
27 Mar 2019

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Related questions

(a) Mitochondria (b) Endoplasmic reticulum (c) Nucleus (d) Lysosome (e) Endosome (f) Peroxisome (g) Golgi apparatus

_____ quality control of mRNA

_____ location of oxidative phosphorylation

_____ responsible for detoxifying organic molecules (liver cells)

_____ houses and protects genetic material

_____ responsible for modification and sorting of proteins and lipids

_____ location of ATP synthesis

_____ responsible for sorting endocytosed materials

_____ site of degradation and digestion

_____ responsible for oxidizing toxic molecules

_____ location of lipid synthesis

_____ location of hormone synthesis (adrenal cells)

B. Which organelle(s) from the above list communicate(s) with other organelle(s) through the use of vesicular transport? ________________

C. Which organelle(s) from the above list receive proteins made in the cytosol?___________________

D. Through which organelle(s) must proteins pass to reach the organelle(s) which do not receive proteins made exclusively in the cytosol?______________

E. Entrance into which organelle(s) requires that proteins unfold and snake through the membrane? _________________

F. How do organelles maintain their position in the cytosol? Be specific.

G. Give 2 advantages that eukaryotic cells gain by having organelles.

1. Parts of the cell:

Answer the following questions pertaining to parts of the cell listed below:

Nucleus, Mitochondria, Golgi, Endoplasmic Reticulum, Lysosome, Plasma membrane, ribosome and peroxisome (10 points total)

a) Is it in both prokaryotes and eukaryotes?

b) Is it enclosed by a lipid membrane?

c) Does it contain DNA?

d) Is it involved in protein synthesis?

e) Does glycosylation occur here?

f) Does lipid biosynthesis occur here?

g) Does it have a role in phagocytosis?

h) Is it required for detoxification?

i) Is it a water storage organelle?

j) Is it involved in protein export? If so how?

29 Most proteins destined to enter the endoplasmic reticulum _________.

(a) are transported across the membrane after their synthesis is complete.

(b) are synthesized on free ribosomes in the cytosol.

(c) begin to cross the membrane while still being synthesized.

(d) are keep binding to Signal recognition particle (SRP) while they are translated.

30 Which of the following choices reflects the appropriate order of locations through which a protein destined for the plasma membrane travels?

(a) lysosome → endosome → plasma membrane

(b) ER → lysosome → plasma membrane

(c) Golgi → lysosome → plasma membrane

(d) ER → Golgi → plasma membrane

31 Which of the following statements about vesicle budding from the Golgi is false?

(a) COPII can initiate vesicle budding on Golgi membrane.

(b) Some vesicles budded from Golgi membranes move towards ER.

(c) Once vesicle budding completed, clathrin molecules are released from the vesicle.

(d) Clathrin molecules act at the cytosolic surface of the Golgi membrane.

32 Which of the following statements is false?

(a) The signal sequences on mitochondrial proteins are first bound to translocator on outer membrane after translation.

(b) Most mitochondrial proteins are not imported from the cytosol but are synthesized inside the mitochondria.

(c) Chaperone proteins in the mitochondria facilitate the movement of proteins across the outer and inner mitochondrial membranes.

(d) Mitochondrial proteins cross the membrane in their unfolded state.

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