High School Level Science

niches

niches

Many of the endangered species in the world have very specific, or narrow, ecological niches. Explain why species with narrow ecological niches are more likely to become extinct than species with broader ecological niches.

ghosthunter   827   1 Reply

bio_man

reproductive barriers

reproductive barriers

Explain how the following situations are reproductive barriers that keep species separate.

a) Species of fireflies use distinctive patterns of fl ashes.

b) Two species of grass flower at different times of year, yet live in the

ghosthunter   1204   1 Reply

bio_man

Comparision between Perch and Grasshopper systems?

Comparision between Perch and Grasshopper systems?

I need to compare the digestive system, the respiratory system, and the circulatory system of a perch and a grasshopper. Please provide structure/function charts for each specimen and explain how each system works in the perch and the grasshopper.

narang   6615   4 Replies

bio_man

enzyme activity

enzyme activity

Iam doing a lab entitled Factors effecting ENZYME Activity. This is part of the chart i have.

TUBE#   pH    Absorbance  Maltose conc.
D1           4     1.29/.76    &nbs

hellomynameis...   1269   1 Reply

bio_man

Which of the following is not found in annelids?

Which of the following is not found in annelids?

14) Which of the following is not found in annelids?
A) a hydrostatic skeleton
B) segmentation
C) a digestive system with separate mouth and anus
D) a closed circulatory system
E) a cuticle made of chitin

jimmy   1701   1 Reply

bio_man

Darwin’s theory of evolution

Darwin’s theory of evolution

Describe how the following items contributed to Darwin’s theory of evolution:

a) his experiences on the voyage of the Beagle

b) Lyell’s Principles of Geology

c) Malthus’s essay about populations

ghosthunter   1211   1 Reply

bio_man

Homeostasis and the Kidneys.

Homeostasis and the Kidneys.

A blood clot lodges in the renal artery and restricts
blood flow to the kidney. Explain why this condition
leads to high blood pressure.

 For every 100 mL of salt water consumed, 150 mL of
body water is lost. The solute conc

sarahnfi   941   2 Replies

sarahnfi

Potato Lab

Potato Lab

hey im doing a lab on the effect of the concentration of sugar in a solution on the transport in a potato.
i was wondering how i would change the percentage of the solute without adding more water? dilute it somehow? or would i just need to chan

needbiohelp!   1246   1 Reply

bio_man

Protists?

Protists?

is a hydra considered a protist? and what about Blepharsima and rotifiers?

needbiohelp!   989   2 Replies

needbiohelp!

Physiological explaination for loss of body water

Physiological explaination for loss of body water

For every 100 mL of seawater consumed, 150 mL of body water is lost. The solute concentration of seawater is greater than that of blood. Provide a physiological explanation for the loss of body water. (Hint: consider the threshold level for salt reab

TRannick   1742   2 Replies

bio_man

a little help please :D

a little help please :D

im stuck on these questions ..
16.    the laboratory where you work wants to invent a blood vessel substitute. After evaluating both synthetic and natural materials, which would you recommend to be most suitable? Why?
also
innate and

smartie22   653   1 Reply

bio_man

HW question

HW question

DNA fingerprinting is based on the premise that:

DNA from the same source will be cut the same way by the same restriction enzymes

or

DNA can be separated by size and charge with gel electrophoresis

qb10   600   1 Reply

bio_man

How does Chondrosarcoma relate to mitosis?

How does Chondrosarcoma relate to mitosis?

How does Chondrosarcoma cancer relate to mitosis?
I need this answer by tonight or very early the next morning. (Due tomorrow.) Please help!!

Bri_bear   889   3 Replies

Bri_bear

Charles Darwin

Charles Darwin

Using two examples, describe how Charles Darwin used observations of the world around him to develop his hypothesis about how species might change with the passage of time.

And


Which of Darwin's theories do you believ

ghosthunter   1604   2 Replies

Biology Forums

Cells pt 2

Cells pt 2

Q. If distiller water is transferred to a patients veins in an attempt to replenish the blood lost, what is the probable result of the transfusion?

A. The patients red blood cells will swell bc the blood fluid is hypotonic to the cells.

patsfan22   612   1 Reply

Biology Forums

Cells

Cells

Hey I really need your help again, please give me an explanation for why these are correct. THANK YOU SO MUCH!!

Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower t

patsfan22   930   2 Replies

patsfan22

Molecular genetics

Molecular genetics

1. Describe 3 situations where complementarity is essential to the survival of the cell.

2. Why is it important that ribosomes are located on the endoplasmic reticulum?


thanks

bob-e   790   1 Reply

sarah!

Organisms that reproduce sexually

Organisms that reproduce sexually

Organisms that reproduce sexually have an evolutionary advantage over organisms that reproduce asexually. Explain and support this statement.

ghosthunter   6931   3 Replies

sarah!

photosynthesis

photosynthesis

What is the protein that can be mutated to increase the efficiency of carbon fixation in C-3 plants?

This is really confusing. We wanted to say that of the amount of CO2 was increased there could be an increase in efficiency of carbon fixa

rfabb   814   1 Reply

bio_man

Photosynthesis

Photosynthesis

Why doesn't water reduce purple sulfur bacteria? why does it use anoxygenic photosynthesis?
Please explain, thanks ! 

rfabb   801   2 Replies

bio_man

operon bacteria

operon bacteria

A typical operon bacteria. how could three structural genes be produced in the presence of a substrate?

and how could this process be turned off?

also what is it an advantage for bacteria to be able to control the production of

mummyofone   1218   2 Replies

star

C-3 plants

C-3 plants

Can you think of a mutation that would help increase the efficiency of carbon fixation in C-3 plants? Explain your reasoning.

shyshy   914   1 Reply

duddy

photosynthesis

photosynthesis

  some bacterial photosynthesizers dont use water as an electron doner. for example, the green sulfur and purple sulfur bacteria can use hydrogen sulfide(H2S). why dont these bacteria emit oxygen to the atmosphere? what do they giive off instead?

shyshy   795   2 Replies

duddy

When NADH transfers its pair of electrons to NADH dehydrogenase, is one proton pumped per 2 ...

When NADH transfers its pair of electrons to NADH dehydrogenase, is one proton pumped per 2 ...

When NADH transfers its pair of electrons to NADH dehydrogenase, is one proton pumped per 2 electron? Because a lot of sources on the internet says that one electron pumps 1 proton but the textbook says that for every 2 electron from NADH or FADH2, o

rainbows246   1468   2 Replies

sarah!

Burrowing owls

Burrowing owls

Hello everybody,
I have to figure out 6 biotic limiting factors of burrowing owls.
I have thought of 3 but I need three more, any ideas?

The three I have written down are  food, trees, and grass. any more?

ghosthunter   4481   2 Replies

lewis

photosynthesis

photosynthesis

You are hired to advise maize producers from sub-saharan Africa on ways to harvest. assume the C-4 maize plants are frown under fully controlled conditions, so you can alter temperature,lighting, atmospheric gases, water supply and nutrients. what co

shyshy   1736   2 Replies

mikael

Water potential of pottato

Water potential of pottato

Hey,
I'm new here, and I'm unfortunately really lost on my biology homework. It's so frustrating, because I feel like I'm the only dumb one in the class AAAH 
Anyway, we did an experiment where we cut up sweet p

wishiwas   1907   3 Replies

duddy

what exactly is a stomate?

what exactly is a stomate?

When you refer to the stomate, is it referring to the entire stoma+the guard cells?

rainbows246   945   3 Replies

bio_man

leukemic cells

leukemic cells

hello there
um i dont know what the roles of leukemic cells are
and why these cells gone cancerous...
plzzz can someone explain these to me?

gangdongwon3   589   1 Reply

bio_man

Spotted Knapweed

Spotted Knapweed

Why does the Spotted knapweed not cause the same damage to its native ecosystem?

ghosthunter   9417   1 Reply

duddy

Enzyme inhibition

Enzyme inhibition

Can someone direct me to some texts on enzyme inhibition? more specifically heavy metal ion inhibition, and even more specifically heavy metal ion inhibition of catalase. But just anything related would be awesome.

rainbows246   1294   4 Replies

duddy

Biotic Factors of The Burrowing Owl

Biotic Factors of The Burrowing Owl

http://www.srd.alberta.ca/BioDiversityStewardship/WildSpecies/Birds/Owls/BurrowingOwl.aspx

After you have read the related article, creat

ghosthunter   5093   1 Reply

bio_man

Isotonic, Hypertonic, Hypotonic

Isotonic, Hypertonic, Hypotonic

How can you tell if a cell is in a hypertonic,hypotonic or isotonic solution if the cell has 10%salt.  the type of solution the cell is in is not specified.

needbiohelp!   5091   6 Replies

duddy

DNA Replication

DNA Replication

Explain why DNA replication is slightly slower in the lagging strand than in the leading strand


thanks!
Hope everyone is having a good weekend 8)

bob-e   757   1 Reply

bio_man

cellular respiration assignment..HELP!!

cellular respiration assignment..HELP!!

Pyruvate diffuses from the cytoplasm into the mitochondrial matrix as it cycled from glycolysis into pyruvate oxidation in eukaryotic cells.
          A) what would happen to the diffusion of pyruvate into the mitochondr

shyshy   1392   2 Replies

bio_man

Plasma Membrane

Plasma Membrane

i was wondering what are permeability rules for the phospholipid bilayer?
and how is the bilayer in control of us? 

needbiohelp!   987   3 Replies

rainbows246

cellular respiration questions?

cellular respiration questions?

The question is: How do living organisms drive endergonic processes? (from the nelson 12 textbook)

I was just wondering if somebody could look over my answer and tell me whats missing or wrong?

I put that:
living organisms

rainbows246   2284   3 Replies

bio_man

DNA Gyrase ambiguity

DNA Gyrase ambiguity

Hello,

My textbook first states that "DNA gyrase is an enzyme that relieves any tension brought about by the unwinding of the DNA strands during bacterial replication."

However, on the sides, it states that it&#

bob-e   580   1 Reply

bio_man

Magnetococcus sp

Magnetococcus sp

What is the full name for Magnetococcus sp. (MC-1) and does it have pili?

peeg   676   1 Reply

bio_man

Pictures for living characteristics

Pictures for living characteristics

hey everybody <<< >>> happy monday <<< >>> i want 5 pictures of the same animal and each of the 5 pictures show a different characteristic of life

example :
picture 1 : the horse has a ponny besides

hasanqusay   3263   4 Replies

hasanqusay