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27 Sep 2018

Plasma membranes are extremely thin and fragile, requiring an extensive support network of fibrous proteins. This network is called the ________.

a.

Spectrin
b.

Cortex
c.

Attachment complex
d.

Cytoskeleton

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Related questions

Mark the correct statements about glycan structure and biogenesis. Question options: Explain why if at all possible, please.

A.) Glycosyltransferases are enzymes which attach sugar moieties to proteins, lipids, and glycans.

B.) Glycosyltransferases make use of a template which directs attachment of sugars.

C.) Lectins are enzymes which remove glycans through hydrolysis reactions.

D.) The rigid structure of cellulose and chitin is due to an extensive network of hydrogen bonds.

E.) Cellulose consists mainly of disaccharides linked by beta-1-4 glycosidic bonds. N-acetyl glucosamine is a disaccharide consisting of glucose and fructose.

F.) Chitin is a branched glycan which mediates cell-cell interactions.

Question 1

Light microscopes

A.

typically provide more resolution than an electron microscope

B.

work by reflecting electrons off the surface of an object being studied

C.

use light and glass lenses to magnify an image

Question 2

In the plasma membrane, the phospholipid heads

A.

are hydrophilic and face outward toward the aqueous solution on both sides of the membrane

B.

are hydrophobic and face outward toward the aqueous solution on both sides of the membrane

C.

are hydrophobic and face inward, shielded from water

Question 3

The nucleus of a cell

A.

is surrounded by a single layer of membrane.

B.

contains DNA

C.

is the primary location of protein synthesis

Question 4

Which location in the cell is unlikely to contain ribosomes or ribosomal subunits?

A.

endoplasmic reticulum

B

plasma membrane

C.

Cytoplasm

Question 5

The main function of the rough endoplasmic reticulum is the production of

A.

membrane and proteins secreted by the cell

B.

mitochondria and proteins secreted by the cell

C.

hydrogen peroxide

Question 6

The Golgi apparatus

A.

is the site of glucose breakdown

B.

stores, modifies, and packages proteins

C.

strings together amino acids to produce proteins

Question 7

The function of mitochondria is

A. cellular respiration

B. photosynthesis

C. lipid synthesis

Question 8

Which of the following statements about the cytoskeleton is false?

A. The cytoskeleton helps to support cell

B. Once laid down, the elements of the cytoskeleton are fixed and remain permanently in place

C.

The cytoskeleton is composed of three types of fibers: microfilaments, microtubules, and intermediate filaments

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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