EEH103 Lecture Notes - Lecture 4: Robert Hooke, Cell Membrane, Membrane Protein

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18 Jun 2018

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Lecture 4 Notes:

CELLULAR LEVEL:

- Cells perform many important functions

- Every living things has cells

- Smallest units of life

- Not all cells are the same

THE CELL:

- Cytology: the study of cells

- 2 classes of cells in the human body

Sex cells

Somatic cells (all body cells expect sex cells)

- Individual part inside the cells called organelles

CELL THEORY: ROBERT HOOKE (1665)

- Living things are made from one or more cells

- The cell is the smallest unit of life

- All new cells come from pre-existing cells

CELL VARIATION:

- STRUCTURE:

Size

Length

Shape

oAll determine the function of the cell

- FUNCTION:

Transport of gas

Reproduction

Production of hormones, enzymes

Transmit electric charges

Contraction

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Storage of energy

Protect the body (immune, destroy bacteria/toxins)

3 MAIN STRUCTURES FOUND INSIDE CELLS:

-PLASMA MEMBRANE:

All cells have a membrane

Separates the external environments from the internal contents of the cell

Protective barrier which regulates which minerals can pass in or out

oSTRUCTURE:

- Phospholipid bilayer – flexible- permeable. Small molecules pass through

- Hydrophobic layers are in the middle, they hate water.

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- Hydrophilic heads are on the outside which pose as a barrier from external and internal

environments

- Proteins are found embedded within the membrane, some extending all the way though

(used to transport minerals)

- Carbohydrates are attached to proteins and lipids on the outer lipid layer

FUNCTIONS:

- Structure

- Support

- Transport of nutrients. (restricts materials based on, size, electrical charge, molecular shape

and liquid solubility.)

MOVEMENT ACROSS THE CELL MEMBRANE:

PASSIVE: substances move without assistance from the cell

- Transport occurs along a concentration gradient

- Small, uncharged substance

oDIFFUSION

- Net movement along the concentration gradient until equality is reached

- Factors that influence diffusion rates:

Temperature

Surface area

Concentration gradient

Size of particles

Diffusion medium

oOSMOSIS

- Movement of water across semipermeable membrane from an area of high water

concentration to an area to low concentrated

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Document Summary

2 classes of cells in the human body. Somatic cells (all body cells expect sex cells) Living things are made from one or more cells. The cell is the smallest unit of life. Shape: all determine the function of the cell. Separates the external environments from the internal contents of the cell. Protective barrier which regulates which minerals can pass in or out: structure: Hydrophobic layers are in the middle, they hate water. Hydrophilic heads are on the outside which pose as a barrier from external and internal environments. Proteins are found embedded within the membrane, some extending all the way though (used to transport minerals) Carbohydrates are attached to proteins and lipids on the outer lipid layer. Transport of nutrients. (restricts materials based on, size, electrical charge, molecular shape and liquid solubility. ) Passive: substances move without assistance from the cell. Net movement along the concentration gradient until equality is reached.

Related Questions

What are the three components of the cell theory?

Of what is the cell membrane is mainly composed?

TRUE or FALSE: A prokaryotic cell has a nucleus.

TRUE or FALSE: An eukaryotic cell does not have membrane-bounded organelles.

Most organelles can be found in both in plants and animals. What three organelles are unique to plants?

What organelles can only be found in animal cells?

Which of the following contains digestive enzymes?

TRUE or FALSE: In most mammals, the DNA found in mitochondria is inherited from the mother only.

TRUE or FALSE: Flagella are not found on eukaryotic cells.

How do phospholipids interact with water to form the cell membrane?

TRUE or FALSE: All living things have a plasma membrane and a cell wall.

What is the first law of thermodynamics?

What is the example of potential energy that was given in the lecture notes?

What is the second law of thermodynamics?

What is entropy?

What is an exergonic reaction?

What is an endergonic reaction?

TRUE or FALSE: An enzyume is an organic molecule (usually a protein) that catalyzes a cellular reaction.

How does an enzyme work?

What is the region of an enzyme that binds the substrate?

TRUE or FALSE: Phagocytosis is an example of bulk transport.

TRUE or FALSE: Osmosis involves the movement of water only.

What is competitive inhibition?

What is non-competitive inhibition?

What is the energy currency of our bodies?

How do particles move in passive transport?

How do particles move in active transport?

Which type of plastid stores starch?

The largest amount of DNA is localized to the ________ in both bacteria and archaea.

Which organelle creates the lysosome?

Which component of the endomembrane system modifies proteins?

Which is the hereditary material of life?

Which organelle contains digestive enzymes to break down ingested bacteria?

In non-competitive inhibition (allosteric regulation), where does the inhibitor bind?

According to the first law of thermodynamics, energy can neither be ________ nor ________ .

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Question 211 pts

Blood cells placed in pure water will burst because there is a net movement of water out of the cell.

True

False

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Question 221 pts

Photosynthesis takes place in tiny organelles within the cell known as mitochondria.

True

False

Flag this Question

Question 231 pts

The balanced chemical equation for cellular respiration is

C6H12O6 + 6O2 â 6CO2 + 6 H2O + 36 or 38 ATP

True

False

Flag this Question

Question 241 pts

A catalyst is anything that speeds up a chemical reaction.

True

False

Flag this Question

Question 251 pts

Kinetic energy is the energy an object possesses due to its motion.

True

False

Flag this Question

Question 261 pts

Changes in temperature and pH may speed up or slow down the activity of an enzyme.

True

False

Flag this Question

Question 271 pts

There are 20 different amino acids.

True

False

Flag this Question

Question 281 pts

The products of the light-dependent reactions of photosynthesis are oxygen, ATP, and NADPH.

True

False

Flag this Question

Question 291 pts

Which of the following is NOT a component of the Cell Theory?

Cells arise only by division of a previously existing cell.

Cells are the smallest units of structure and function

All organisms are composed of one or more cells.

Cells can vary their shape and size to suit the environment for survival.

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Question 301 pts

What is the name of the two subatomic particles that can be found in the nucleus of an atom?

neutrons and electrons

protons and neutrons

protons and electrons

protons and morons

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Question 311 pts

Atoms that have either a positive or negative charge are known as:

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Question 321 pts

An atom with an unfilled outer energy level (electron shell) is likely to be:

inert

unable to form bonds with other atoms

reactive

extremely stable

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Question 331 pts

All living things are able to maintain stable internal conditions. This is known as

metabolism

homeostasis

heredity

cellular organization

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Question 341 pts

Which of the following is NOT considered to be one of the five basic properties shared among living organisms?

made of one or more cells

grow and reproduce

posses DNA

need oxygen to survive

Flag this Question

Question 351 pts

CFCs (Chlorofluorocarbons) in the stratosphere cause:

global warming due to increased CO2

increase ozone levels by converting O2 to O3 and decreasing UV passage to Earth.

act as a catalyst to destroy ozone increasing UV passage to Earth.

increased ice crystal formation that cools the earth.

Flag this Question

Question 361 pts

The process by which traits are passed from parents to offspring is known as:

Flag this Question

Question 371 pts

Alcoholic fermentation occurs in muscle cells of the human body.

True

False

Flag this Question

Question 381 pts

If carbon has 6 protons and 6 neutrons, how many electrons must it have to be electrically neutral?

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Question 391 pts

The loss of an electron is known as _______; the gain of an electron is known as ________.

reduction; oxidation

transduction; adduction

oxidation; reduction

removal; addition

Flag this Question

Question 401 pts

Kinetic energy is the stored energy that can be used for motion.

True

blushfox941

__________ are fairly small organelles that provide a safe place within the cell to carry out certain biochemical reactions that generate harmful, highly reactive oxygen species. These chemicals are both generated and broken down in the same location.

Lysosomes

Endosomes

Peroxisomes

Nucleosomes

Biologists cannot possibly study all living species. Instead, they try to understand cell behavior by studying a select subset of them. Which of the following characteristics are useful in an organism chosen for use as a model in laboratory studies?

rapid rate of reproduction

all of the above

ability to grow under controlled conditions

amenability to genetic manipulation

By definition, prokaryotic cells do not possess __________.

ribosomes.

a nucleus.

membrane bilayers.

replication machinery.

Cell biologists employ targeted fluorescent dyes or modified fluorescent proteins in both standard fluorescence microscopy and confocal microscopy to observe specific details in the cell. Even though fluorescence permits better visualization, the resolving power is essentially the same as that of a standard light microscope because the resolving power of a microscope is limited by the __________ of light.

intensity

absorption

wavelength

filtering

Choose the phrase that best completes this sentence: Microtubules ____________ and are required to pull duplicated chromosomes to opposite poles of dividing cells.

generate contractile forces

can rapidly reorganize

are found in especially large numbers in muscle cells

are intermediate in thickness

Despite the differences between eukaryotic and prokaryotic cells, prokaryotes have proteins that are distantly related to eukaryotic actin filaments and microtubules. What is likely to be the most ancient function of the cytoskeleton?

cell division

cell motility

vesicle transport

membrane support

DNA and RNA are different types of nucleic acid polymer. Which of the following is true of DNA but not true of RNA?

It contains thymine.

It has 5'-to-3' directionality.

It is single-stranded.

It contains uracil.

Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________.

prevent additional bonds from being formed with the bonded atoms.

limit the rotation of the bonded atoms.

create a new arrangement of electron shells.

change the reactivity of the bonded atoms.

Drosophila melanogaster is a/an __________. This type of animal is the most abundant of all animal species, making it an appropriate choice as an experimental model.

mammal

amphibian

bird

insect

10.

If the isotope 32S has 16 protons and 16 neutrons, how many protons, neutrons, and electrons will the isotope 35S have, respectively?

16, 19, 17

16, 19, 15

16, 19, 16

16, 20, 15

11.

Living systems are incredibly diverse in size, shape, environment, and behavior. It is estimated that there are between 10 million and 100 million different species. Despite this wide variety of organisms, it remains difficult to define what it means to say something is alive. Which of the following can be described as the smallest living unit?

cell

organelle

protein

DNA

12.

Macromolecules in the cell can often interact transiently as a result of noncovalent interactions. These weak interactions also produce stable, highly specific interactions between molecules. Which of the factors below is the most significant in determining whether the interaction will be transient or stable?

the concentration of each molecule

the size of each molecule

surface complementarity between molecules

the rate of synthesis

13.

Many of the mechanisms that cells use for maintenance and reproduction were first studied at the molecular level in bacteria. Which bacterial species had a central role in advancing the field of molecular biology?

E. coli

S. pombe

C. elegans

D. melanogaster

14.

Many types of cells have stores of lipids in their cytoplasm, usually seen as fat droplets. What is the lipid most commonly found in these droplets?

cholesterol

isoprene

triacylglycerol

palmitic acid

15.

Mitochondria contain their own genome, are able to duplicate, and actually divide on a different time line from the rest of the cell. Nevertheless, mitochondria cannot function for long when isolated from the cell because they are __________________.

anaerobes.

viruses.

parasites.

endosymbionts.

16.

Mitochondria perform cellular respiration, a process that uses oxygen, generates carbon dioxide, and produces chemical energy for the cell. Which answer below indicates a correct pairing of material âburnedâ and the form of energy produced during cellular respiration?

17.

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. Which one of these molecules contains polar bonds?

EEH103 Lecture Notes - Lecture 4: Robert Hooke, Cell Membrane, Membrane Protein

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