Biology Pop Quiz

adam_ccfc

Corruptedmorals wrote:

Longest-femur. Shortest- Hammer (I think). Don't know a bone not attached to any other..

Define respiration, and explain what happens in Krebs Cycle.

The controlled release of energy from energy-rich chemicals in cells.

Krebs cycle: Acetyl CoA enters the Krebs Cycle in the lumen of the mitochondrion. Here, CO2, electrons, and Hydrogen ions are drawn off. The electrons and hydrogen ions are taken by NAD (as NADH) to the electron transport chain. The CO2 is an end product of respiration, and is either released from the cell, or used for photosynthesis.

Explain the process of Protein Synthesis.

Your Man

DNA uncoils and is transcribed into mRNA
THis mRNA then leaves the nucleus and enters a sub-unit of the ribosome
tRNA enters ribosome and attach to adjacent mRNA and each amino acid binds with mRNA until a stop codon is reached.
New protein is then made

Give a brief account on the mechanism which controls hearbeat..

shazzyshaz

Your Man wrote:

Give a brief account on the mechanism which controls hearbeat..

The sinoatrial node( pacemaker) stimulates the atria to contract, the AV node then contracts and sends a message down the purkinje tissue to the bundle of his which stimulated the ventricle to contract.


I have no idea! is this correct? feel free to change my answer- we;re still in the learning process!! lol

genericgoon

shazzyshaz wrote:

The sinoatrial node( pacemaker) stimulates the atria to contract, the AV node then contracts and sends a message down the purkinje tissue to the bundle of his which stimulated the ventricle to contract.


I have no idea! is this correct? feel free to change my answer- we;re still in the learning process!! lol

Its fine though you may want to mention diastole(relaxation) and systole(contraction) at different stages. I believe one year those were compulsory terms for the marking scheme

Selphie

Nobody's left a question, so I'll take the initiative...

What is a quantitative study?

shazzyshaz

Selphie wrote:

Nobody's left a question, so I'll take the initiative...

What is a quantitative study?

aims to see how much of each organism is in a habitat.

what is a qualatative study?

Tula

shazzyshaz wrote:

what is a qualatative study?

aims to see what organisms live in a habitat

Corruptedmorals

What's with the amount of people who don't ask questions? Jeez.

Name 3 differences between monocot and dicot plants.

genericgoon

Well I didnt actually answer the question. I was just supplementing it.

Anyways, Dicots= Seeds have 2 cotyledons(the clues in the name ), Regular circular distribution of vascular bundles in stem ,leaf's have reticulated veins

Monocots= Seeds have 1 cotyledon, parallel leaf veins and random distribution of vascular bundles in stem.

Question: Name 3 plastids.

balzarywex

chloroplasts, chromoplasts, leucoplasts.

list the stages in viral replication, giving examples of viruses which affect plants, animals and humans.

Corruptedmorals

Ehh, stages? In our book, they're just numbered with pictures really.

The virus attaches itself to the host cell, and inserts it's RNA into the cell.
The RNA destroys the bacterial machinery, manipulating it to assemble new viruses.
The viruses burst out of the cell.

Explain the Dixon-Joly theory of Cohesion-Tension.

Diamond007

Transpirational pull results ultimately from the evaporation of water from the surfaces of cells in the interior of the leaves. This evaporation causes the surface of the water to pull back into the pores of the cell wall. Inside the pores, the water forms a concave meniscus. The high surface tension of water pulls the concavity outwards, generating enough force to lift water as high as a hundred meters from ground level to a tree's highest branches. This only works because the vessels transporting the water are very small in diameter, otherwise cavitation will break the water column.

Emmmm what are phytoalexins?

bebop!

Phytoalexins are stress proteins produced by a plant when it is infected by a micro-organism.

These stress proteis can act by damaging the micro-organisms by attacking their cell walls.

They can stimulate the formation of specialised plant cell walls that prevent the spread of micro-organisms

and can stimulate nearby plants cells to respod to the micro organism.



Q. As regards Ecology distinguish between A Qualitative and A Quantitative Study.

Marshy

Qualitative- prescence/abscebce of species

Quantitative- number of a species


Q. 4 benefits of breast feeding?

Selphie

1. Milk contains the ideal balance of nutrients for the baby.
2. Milk supplies antibodies to the baby that prolong the baby's ability to resist infections.
3. Less chance of infection by micro-organisms than if baby is bottle-fed.
4. Helps the mother's body to recover from the effects of pregnancy and birth.

Q: Distinguish between active immunity and passive immunity.

bebop!

Active Immunity
Involves production of a persons own antibodies in response to antigens that enter the body.

Passive Immunity
This is when individuals are given antibodies that were formed by another organism.

I really enjoy this thread !! i no im sad really haha

heres a good one

Q. Name the only organ that is formed from the tissues of two different individuals and name the tissues aswell

Corruptedmorals

What's with the random questions that are..irrelevant!!

Ehh, the body itself? The zygote?? WHAT??

eZe^

bebop! wrote:

Active Immunity
Involves production of a persons own antibodies in response to antigens that enter the body.

Passive Immunity
This is when individuals are given antibodies that were formed by another organism.

I really enjoy this thread !! i no im sad really haha

heres a good one

Q. Name the only organ that is formed from the tissues of two different individuals and name the tissues aswell

Placenta? Not sure on the tissues.


In the rate of photosynthesis experiment how did one prepare the plant? (came up on a couple of pre s)

Nehpets

cut the stem at an angle and left it pointing upwards?

I'm not sure on this so I won't ask another question

eZe^

Nehpets wrote:

cut the stem at an angle and left it pointing upwards?

I'm not sure on this so I won't ask another question

Kinda, you get the marks from a nice examiner id say!, you pinch the steam to ensure that the pathway oxygen isnt blocked!

bebop!

I did not no dat answer about pinchin da stem:eek:

btw the placenta is formed from the uterine tissue of the mother and the embryotic (trophoblast) tissue from the embryo:)

I better ask another question ......

Genetics . Sex Chromosomes

True or False. It is the Male who determines the sex of the child. Explain your answer.

genericgoon

Yes because the male has an X and Y sex chromosome and the gender of the child is determined by whether there is an 2 X chromosomes or an X and a Y chromosome and thus its the males gamete (which will have either an X or Y chromosome) that determines sex of the child.


If animal cell= eukaryotic and bacterium= prokaryotic then virus=?(and give the meaning of the word as well if you wish)

Steve01

Prokaryotic since it contains no membrane enclosed organelles.

Define the terms (1) niche (2) biosphere (3) ecological pyramids

genericgoon

Steve01 wrote:

Prokaryotic since it contains no membrane enclosed organelles.

Wrong! Try again.

Corruptedmorals

Viruses are eukaryotic, but are classed as non-living, though when they enter a host-cell, they display living characteristics.

A niche is an organism's specific role in the habitat. The biosphere is the areas of the Earth where animals can live. Ecological pyramids show the relations between various plants and organisms in the habitat. Eg Leaves on the bottom, aphids on the next tier, wrens on the next tier, thrushes on the top, each in decreasing numbers.

Name a person who contributed to the evolution theory and give a brief account, with reference to observations that led to his conclusions..

genericgoon

Corruptedmorals wrote:

Viruses are eukaryotic, but are classed as non-living, though when they enter a host-cell, they display living characteristics.

Wrong again. They are akaryotic.

Corruptedmorals

? That's not in my book.

genericgoon

Corruptedmorals wrote:

? That's not in my book.

Which one do you use? its in my one ,Biology Now!Though its not a big point and thus is only really knowledge for knowledges sake

Corruptedmorals

The one with the greenfly eating the leaf. 'Discovering Biology' I think. Thoguh I also have the book for the old curriculm, and a 3rd level biology book. I'd say they are 'akaryotic', just never heard the term before, but it's most likely in the other 2 books I have...though they were both written in the early 80s.

eZe^

Corruptedmorals wrote:

Viruses are eukaryotic, but are classed as non-living, though when they enter a host-cell, they display living characteristics.

Bacteria are prokaryotic and have living characteristics? Showing living characteristics has nothing to do with prokaryotic and eukaryotic, its whether or not they have a clearly defined nucleus.