General Biology

In the development of terrestrial biomes, which factor is most dependent on all the others?

In the development of terrestrial biomes, which factor is most dependent on all the others?

I desperately need help and i got a really bad grade on this test. For corrections i have to explain why the answer is right. will someone explain why these answers are right.
Thanks for all your help!!!!



1) In the

flower555   9950   3 Replies

bio_man

pH balance of liver secretions

pH balance of liver secretions

how are the liver secretions to the intestine and liver secretions to the blood different in their response to acid additon? Why do they need to be different?
Thanks so much!

joy510   1386   1 Reply

bio_man

hormone

hormone

answer this question in detail:

your book discusses blood clotting as an example of a positive feedback system. Research and then explain the role of the human hormone oxytocin in a positive feedback loop.

* the book i am using

flower555   1052   1 Reply

bio_man

Following clear cutting of a broadleaf forest several hundred years ago, the land was colonized by ...

Following clear cutting of a broadleaf forest several hundred years ago, the land was colonized by ...

I need help with these. Can someone explain why the following answers coresspond with each question and why? I need the points!!!!!!
14) Following clear cutting of a broadleaf forest several hundred years ago, the land was colonized by herbac

flower555   1037   1 Reply

bio_man

creating a map of three linked genes

creating a map of three linked genes

On chromosome #2 of the fruit fly there are three linked genes: vestigial, black, brown or bl-vg-br.  The genes are in that order.  In my parental cross a vestigial black brown fly is mated with a wild type fly.  All F1 are wild type.

confused_student   1108   1 Reply

bio_man

Allelopathy

Allelopathy

I need to give examples of allelochemicals and how they might affect plant photosynthesis. Can someone help me?

bh08   744   2 Replies

bio_man

cell signaling

cell signaling

For my Bio 1 course we have an assignment. The directions are as follows: Describe the content of a popular science article in simple terms. The topic: Cell signaling and communication. Task: write something about enteric infections that are food-bor

bh08   1183   3 Replies

star

trp operons

trp operons

Describe how the trp operons work? How do trp operons and lac operons differences relate their different metabolic functions?

Chris   3178   2 Replies

Chris

Plant Diversity

Plant Diversity

Thanks guys

How does indoleacetic acid ( ?natural auxin) affect fruit development?
A) preventing pollination
B) inhibiting formation of the ovule
C) promoting gene expression in cambial tissue
D) promoting rapi

Guru_Kid   7901   9 Replies

sarah!

Catabolite Repression

Catabolite Repression

Describe catabolite repression and relate it to diauxic growth.

Chris   1031   1 Reply

bio_man

process of conjugation

process of conjugation

Describe the process of conjugation, differentiating between F plasmid transfer and Hfr formation. How does genomic DNA get transfered between bacteria?

I have no idea what its talking about.... PLEASE HELP!!!

Chris   3106   1 Reply

bio_man

Angio/Gymnosperms

Angio/Gymnosperms

Here's are the questions. Thanks for answering the other ones ^.^

 ________ are the most successful group of nonvascular plants and can be found in tropical environments
A.   sorus
B.   liverwarts
C.   fe

Guru_Kid   3626   3 Replies

karim89

dihybrid cross ... are they linked?

dihybrid cross ... are they linked?

Using this data could you help me figure out if these genes are linked and if they are what’s the distance between them? 
This is a dihybrid cross working with fruit flies.  Parental generation is a sepia eyed male x apterous female.&

confused_student   3326   10 Replies

bio_man

help with enzyme problem

help with enzyme problem

Which of the enzymes shown must occur in the gastric region (stomach) of the gastrointestinal tract? [img]http://session.masteringbiology.com/problemAsset/1223649/1/6.5-2.jpg/img]

gspara1   1908   1 Reply

bio_man

Help with calculations

Help with calculations

E coli carrying a plasmid with an average copy number of 100 is incubated overnight at 37 degrees in liquid culture to gain a saturated density of 3 x 10^9 cells per mL. If the plasmid DNA is purified from 1.5 mL of this culture and redissolved in a

Sara   1548   4 Replies

bio_man

lab help needed urgently due in 10 hrs

lab help needed urgently due in 10 hrs

Hi we conducted Benedicts, lugols,barfoeds,bials and seliwanoff test on 3 unknowns ( the possible unknowns are apple juice, honey and gatarode) and after performing tests we have to tell which unknown is which please see the picture attached&nb

amal   1168   3 Replies

padre

Potato lab

Potato lab

we did a potato lab in class.
 we put 3 potatos in different solutions
potato A: is in 100% in water
potato B: is in 10 % of water
potato c: is in more than 10 % of salt
please help!
answer the follwoing questions:

flower555   5903   3 Replies

bio_man

Absorbance spectrum

Absorbance spectrum

1. What is absorption spectrum and its use?

2. What is blank made up of and its use?

3. What are industrial uses of starch?

amal   1266   3 Replies

bio_man

All of the alleles of all the genes in a population represent the population's?

All of the alleles of all the genes in a population represent the population's?

All of the alleles of all the genes in a population represent the population's?
gene pool.
Hardy-Weinberg equilibrium.
genotype.
gene flow.
genome.

The usage of the insecticide DDT to control mosquitos resulte

indapark   2957   2 Replies

bio_man

College Bio lab

College Bio lab

Using the concepts of free water molecules and water molecules bound in hydration shells, explain why water diffused in one direction.

Jessica_N   880   2 Replies

Jessica_N

College Bio Lab again!

College Bio Lab again!

How would your results change if we added a 20% starch solution mixed in a 1% Na2SO4 solution to the beaker in place of the mixture you used?
Please help! i have no clue as to what the answer could possibly be. 

Jessica_N   1056   3 Replies

bio_man

The photosynthetic event known as the Calvin cycle occurs in the

The photosynthetic event known as the Calvin cycle occurs in the

     How does carbon dioxide enter the leaf?
 
   A.    through the mesophyll
   B.    through the stomata
   C.    through the stem
   D.    through the chloroplasts
   E.    through the roots

Question 2   
 

Matty0132   4301   1 Reply

sarah!

Genetics

Genetics

If 100 individuals of an F2 population derived from parent A and parent B were analysed for 80 markers across the genome, the numbers of markers that will display heterozygosity in 50 individuals is:
A) 10
B) 20
C) 40
D) 60
E

lara   1171   2 Replies

sarah!

Which of the following is true of the fluid mosaic model of membrane structure?

Which of the following is true of the fluid mosaic model of membrane structure?

Which of the following is true of the fluid mosaic model of membrane structure?
    A) Membranes behave more like a solid than a liquid.
    B) Lipids can flip from one leaflet to another as easily as they can move laterally in a membrane.

jutt   1444   1 Reply

bio_man

Using your results from this test make one inductive conclusion about the geometric shape of ionic ...

Using your results from this test make one inductive conclusion about the geometric shape of ionic ...

There are different experiments that we have to do and we have to make a hypothesis and answer the questions. Can u please make up the hypothesis.

Experiment A:
Purpose: to observe the shape of an ionic solid and a covalent solid.

flower555   9263   3 Replies

bio_man

Help! please

Help! please

The hormone insulin is a protein produced in the pancreas and then secreted into the blood stream after a meal to increase glucose uptake by tissues. Which of the following mechanisms would be used to secrete insulin from the pancreas?
   A) Activ

jutt   4618   1 Reply

bio_man

Indicate if the following statements about membrane proteins are true or false.

Indicate if the following statements about membrane proteins are true or false.

Indicate if the following statements about membrane proteins are true or false.

A. They can aid in the transportation of molecules across membranes.
B. They are used in DNA replication.
C. They can act as cell surface receptors

jutt   5186   1 Reply

bio_man

complex and simple traits

complex and simple traits

Sally is analysing the segregation of two phenotypes in a F2 population. One trait is qualitative (simple) and another trait is quantitative (complex). Sally is likely to find
A) continuous segregation of both traits
B) discrete segregation

lara   3655   2 Replies

sarah!

need help with Bio test review

need help with Bio test review

hey there. i have been given a practice exam for my exam coming up in 2 weeks. its 55 questions but the ones i have posted here i am not sure about my answer. any help would be appreciated. thx

1. 
    The following steps are requ

biosen   4121   4 Replies

bio_man

Explain in detail (i.e., at the level of chemical structures and atoms) the reaction between ...

Explain in detail (i.e., at the level of chemical structures and atoms) the reaction between ...

1. Explain in detail (i.e., at the level of chemical structures and atoms) the reaction between incoming dNTPs and the growing polymer of DNA, illustrating how this reaction proceeds in the 5’ to 3’ direction.

joe52   1160   2 Replies

bio_man

vocab word needed

vocab word needed

The ability of plants to grow, produce fruit, and other processes at the right time of year is called _______?

Sparks   2389   3 Replies

bio_man

Regarding chemical reactions

Regarding chemical reactions

I need some help please. Thanks.

1. The third law of thermodynamics tells us that:
A. Gibb's free energy is available to perform work
B. energy can neither be created nor destroyed
C. spontaneous processes always result

silos   1106   1 Reply

star

plz help on quiz 5 :D

plz help on quiz 5 :D

NAME_________________________ _____________________________ ___
____1.     Plants respond to water stress by
      a.   closing stomata.      b.  reducing photosynthesis.   c.  producing fewer flowers.
      d.   producing fewer seeds. 

mark1532   8645   5 Replies

mark1532

DNA is killing me!

DNA is killing me!

what property of DNA allows it to be separated  by size using gel electrophoresis?

gh1991   777   1 Reply

bio_man

Calculate the amount of DNA present in your sample if the absorbance at 260 is 0.3

Calculate the amount of DNA present in your sample if the absorbance at 260 is 0.3

CALCulate the amount of DNA present iin your sample if the absorbance at 260 is 0.3

gh1991   2193   2 Replies

bio_man

DNA AND PLASMID...help

DNA AND PLASMID...help

what is the difference between bacterial genomic dna that results in the precipitation of genomic DNA with proteins, leaving the plasmid in the supernatant?
-please n thanks

gh1991   768   1 Reply

bio_man

boil buffa

boil buffa

what is in the boil buffer that helps "break open" the bacterial cells??
-thanks =)

gh1991   927   1 Reply

bio_man

Am I going to get cancer now?

Am I going to get cancer now?

I was doing gel electrophoresis and I made 2 mistakes!

1.) I got a few drops of Ethidium Bromide on my hands

2.) I reached my hand under the UV light to adjustthe position of the gel.  My hand was under there for about 10-1

Polymorphism   1226   5 Replies

bio_man

the ended non-sticky DNA :)

the ended non-sticky DNA :)

the blunt ended (non-sticky) segment of dna shows below has restriction sites I and II cut by the HindIII restriction enzyme, which creates restriction fragments A,B, and C. Draw a cartoon of what the bands would look like on the gel after restrictio

gh1991   1052   1 Reply

bio_man

A researcher infects a bacterium with a bacteriophage (bacterial virus) and notices...

A researcher infects a bacterium with a bacteriophage (bacterial virus) and notices...

Which of these is mismatched?
tetanus—bacterium
malaria—protozoan
kuru—prion
AIDS—virus
food poisoning—archaea

A researcher infects a bacterium with a bacteriophage (bacterial virus) and notices that the infection

indapark   9490   1 Reply

bio_man