Cell And Molec TEST 1 (c)

Which type of microscope has the greatest resolving power?

electron

Single channel recording is a

technique that allows to measure electrical currents through a single ion channel molecule

osmosis

The movement of water through a membrane from an area of high concentration to an area of low concentration is known as

Cellulose is a polymer of ________a common monosaccharide.

glucose

While fishing, a biology student makes the following observations: 1) water spiders may be

walking on water, 2) flat rocks may be made to skip across the water. Which of the following

properties of water can explain these observations?

Water molecules are associated via hydrogen bonds and cohesive

The rate of facilitated diffusion is limited predominantly

by the number of transport proteins in the membrane

Which of the following is true of a nanometer?

A nanometer is one millionth of a millimeter (or 1x10-9 m)

a nanmo is equivalent to 10 angstroms

Which of the following is NOT a function of membranes?

Information storage

The two most important properties that allow a molecule to cross a phospholipid simple diffusion are

polarity and size

Which of the following biological polymer is mismatched with its monosaccharide?

Cellulose-fatty acid/amino

Glucose cannot cross the lipid bilayer

because it's too large.

The polarity of water is caused by the

unequal sharing of electrons between oxygen and hydrogen atoms.

Substances that can readily pass through the cell membrane are chemically__________ by nature

non-polar

CFTR belongs to

ABC transporters

Which is the strongest of the following forces that stabilize protein structure in solution?

Covalent bonds

V-type ATPase

pumps protons into vesicles

Which of the following is the smallest?

protein

One of the strategies for a single cell to increase its membrane transport efficiency is

cytoplasmic streaming

You are designing a protein that will transport potassium into the cell which protein will it be?

ATPase

Biologically, which of the following is the least important characteristics?

Water typically contains isotopes of hydrogen

Ribosomes that do not anchor to the surface of the rough endoplasmic reticulum during

translation most probably are

synthesizing cytoplasmic proteins

The hydropathy plot of a protein shows four hydrophobic regions. Which protein is true? The protein has

four hydrophobic domains

Which of the following is a disaccharide?

Lactose

The main differences between plant and animal cells are

chloroplasts, vacuoles, and cell wall

The transport of two molecules across the cell membrane in opposite direction is called

antiport.

A voltage-gated calcium-activated chloride channel

is activated by volatge and calcium conducts cl

Which of the following is NOT a tenet of the cell theory?

All cells have a membrane bound

nucleus

1 mm=

1,000,000nm

1 nm=

1/1,000,000mm

Cellulose belongs to which of the following groups of macromolecule?

Polysaccharide/carbohydrates

_________are liquid at room temperature, while_____are solid

Unsaturated fatty acids: saturated fatty acids

Which of the following can ONLY be viewed by electron microscopy?

Viruses

Diffusion is a trans membrane movement of a substance with the concentration gradient, with

no involvement of membrane proteins

Trypsin is a hydrophilic protease enzyme and cannot cross the plasma membrane. It can however, cut the hydrophilic parts of the proteins that are exposed to the extracellular environment. When the cells are treated with trypsin, in how many fragments will a protein with six trans membrane domains and both ends of the protein in the cytoplasm be cut?

4

Sedimentation coefficient is

a ratio between the velocity of the particle and the acceleration during centrifugation

Cells of the pancreas produce and directly release enzymes of the digestive system. The type of secretory mechanism associated with the pancreatic cells is

regulated secretion

Which of the following organelles are not part of the endomembrane system?

mitochondria

Smooth ER functions in drug detoxification process by

adding hydrophobic residue to hydrophilic drugs

Transport of vesicles from plasma membrane to Golgi to ER is called

retrograde transport

Clathrin lattice assembly is similar to a

soccer ball

Endocytosis involves

invagination of the plasma membrane, trapping particles and internalizing

Rough ER is involved in

protein synthesis and cotranslational insertion, protein maturation, removal of misfolded protein

Which of the following statements is false regarding phagocytosis? It involves the

projection of pseudopodia

A protein is destined to be secreted from a cell in which of the following you expect to find the protein first?

Golgi apparatus

Which of the following cell junctions are associated with the proper alignment of epithelial cells?

gap junctions, tight junctions,desmosomes, adhesive junctions

Which of the following is NOT associated with the adhesive junctions?

connexin

Heterotypic interactions of the cell adhesion proteins involve the

different proteins from different cells

You are studying the effects of calcium influx on vesicle release. If channel blocker, you would expect

no release

Tight junction is mostly permeable to

cations

With regard to the semi-permeable nature of the plasma membrane, which of the following would readily cross it without the aid of a transport protein?

Water

Transmembrane movement of a substance along its concentration gradient is

active transport

The cells with the largest single dimension in our bodies are:

oocytes

A scientist is examining motile protozoa. He wishes to determine their direction of movement. Which of the following microscopic techniques is LEAST likely to be used to view these cells:

Electron Microscopy

The isotonic medium

has the same concentration of solutes as the cell.

During receptor-mediated endocytosis, the ultimate fate of the vesicle and/or its contents include(s):

Transport to late endosome for digestion, transcytosis, recycling of receptors

Based on your knowledge of the chemistry of the cell membrane, which of the following compounds would you couple with a new drug in order to achieve better uptake by the cells?

Lipid

Collagens are associated with which of the following types of cellular junctions?

None of the Above

Which of the following is NOT soluble in water?

Lipids

Ion channels participate in what type of membrane transport?

Facilitated diffusion

Which of the following sequences correctly lists the hierarchical nature of cellular structure from smallest to largest?

organic molecules, macromolecules, supramolecular structure, organelles, cell

Why is a selectively permeable membrane so important to living cells?

It provides a good

barrier between the inside and the outside of the cell

Cystic fibrosis is the result of malfunction of the cell in transporting which of the ions?

Cl-

You have genetically engineered a yeast cell to make a protein that will ultimate secreted from the cell. If all is functioning well, in which order (first to last) find the protein in the cell until it is secreted?

ER-Golgi- secretory vesicle-environment

The energy for loading a neurotransmitter into a secretory vesicle:

A proton gradient

established by the proton pump on the