Question by heather: having a little trouble with these questions any ideas?
1)What is the source of energy that supports life on Earth? How is this energy passed from one organism to the next?

2)Compare and contrast: a sodium atom and a sodium ion; an atom of weak and strong electronegativity; the electron distribution around an oxygen atom bound to another oxygen atom versus oxygen bound to two hydrogen atoms; covalent and noncovalent bonds.

3)Given that proteins act as molecular machines, explain why conformational changes are so important in protein function.

4)Discuss the differences between ?G and ?G°?; between the relative rates of the forward and reverse reactions when ?G is negative, zero or positive.

5)The reaction X ? Y + Z has a ?G°? = +1.5 kcal/mol. An in vivo analysis found that within a cell the concentration of X is 1 x 10-3 M, Y is 5 x 10-3 M and Z is 8.3 x 10-2 M.

a.Is the ratio of products to reactants what you would have predicted given the ?G°?? Why or why not?
b.Given the data, calculate the actual ?G?
c.Based on the

Best answer:

Answer by B R
1. The sun drives ALL the energy on Earth. The sun warms the oceans causing clouds and rain. The sun also provides nutrients to to plants through photosynthesis. Animals eat the plants, and then other animals eat those animals. Energy is passed through consumption of lower energy lifeforms

What do you think? Answer below!

Question by broookeee: 4 questions biology?
1. A scientist views an unidentified unicellular organism under a microscope. As the organism is being viewed, it is traveling from one side of the slide to another and is lacking a membrane-bound nucleus. Based on these observations, the cell on the slide is likely a(n):

A. Animal cell with cilia
B. Plant cell with chloroplast
C. Animal cell with mitochondria
D. Bacterial cell that has a flagellum
2. Prokaryotic cells are different from eukaryotic cells. What characteristic would identify an individual as being prokaryotic?

A. The presence of a cell membrane
B. The presence of a mitochondrion
C. The absence of a nuclear membrane
D. The absence of chlorophyll
3. The Germ Theory describes how microorganisms invade and infect living organisms. The invention of what technological tool helped to construct the Germ Theory?

A. Microscope
B. Satelites
C. Telescope
D. Magnetic resonance imaging machine (MRI)
4. Which statement is a valid argument to support that viruses are NOT living organisms?

A. Viruses are harmful to living organisms.
B. Viruses contain DNA and can reproduce alone.
C. Viruses require the presence of a host cell in order to reproduce.
D. Viruses transmit genetic information and change the function of a cell.

Best answer:

Answer by Al
1. if it doesnt have a membrane bound nucleus, it isnt a plant or animal cell.
2. see answer #1
3. microorganisms so must be microscope
4. c they need a host to reproduce

What do you think? Answer below!

Question by kooltiffrocks: A Few history Questions?? american history?
I need help with the following questions, I need to answer them for an assignment and i can’t seem to find any of them….

At the Battle of the Somme, the Allies introduced
– propaganda.
– machine guns.
– barbed wire.
– tanks.

The First Battle of the Marne took place in
– Germany.
– Italy.
– Belgium.
– France.

German U-boats
– protected German merchant ships.
- pursued a policy of neutrality.
-attacked ships bound for Great Britain.
– transported arms for the war effort.

The Schlieffen Plan called for
– the invasion of France through Belgium.
-airplane dogfights over disputed territory.
-a policy of neutrality.
– the sinking of the Arabic and the Sussex.

Best answer:

Answer by evanlouis15
1. http://en.wikipedia.org/wiki/Battle_of_the_somme.

2.http://en.wikipedia.org/wiki/Marne

3.http://en.wikipedia.org/wiki/U-boat

4.http://en.wikipedia.org/wiki/Schlieffen_Plan

Add your own answer in the comments!

Question by Matthew B: Linux questions?
I have an exam this week and the review contained 200 exam prep questions. I have answered and worked my A. off on the and these are the 25 out of 200 I couldn’t figure out. They may seem remediale to some of you but I am asking to please help me with these last few so I can study the correct answers thanks.

1.Which of the following are power management protocols?
A)ACPI
B)PPP
C)SMTP
D)APM

2. Which of the following would you want to remove from a system that would serve solely as a firewall?(Choose all that apply.)
A)init
B)Telnet client
C)Linux Kernel
D)Apache server

3. Which tool would you use to setup a firewall on a Linux system?
A)Apache
B)iptables
C)wall
D)TCP wrappers

4. What is the intended purpose of the rc.local or boot.local startup script?
A)Sets system time zone and language defaults
B)Holds startup commands for its specific computer
C)Displays startup messages
D)Verifies that all other startup scripts are operating correctly

5. Which of the following protocols can help with configuration of SCSI devices?
A)SCAM
B)SMB
C)ASPI
D)ATAPI

6. Which of the following is not a responsibility of lpd?
A)Maintaining printer queues
B)Accepting print jobs from remote machines
C)Informing applications of printer’s capabilities
D)Sending data to printers

7. Which of the following would show the contents of a tarball, including size and time stamps?
A)tar xzf
B)tar tzf
C)tar tvzf
D)tar x

8. Which of the following does an ethernet switch allow but a hub does not?
A)100Mbps operation
B)Linking more than five computers
C)Full duplex operation
D)Use with 10 Base 5 cabling

9. What types of devices may be attached via the USB port?(Choose all that apply)
A)Keyboards
B)Modems
C)RAM
D)Mouse

10. How would you direct the output of the uptime command to a file called uptimestats.txt?
A)echo uptimestats.txt
B)uptime > uptimestats.txt
C)uptime | uptimestats.txt
D)uptime < uptimestats.txt

11. What role does BIND fill?
A)Allows programs to use dynamic library files
B)Translates between names and IP addresses
C)Ties together POP and SMTP servers
D)Binds and IP address to a network interface

12. You think that a router between you and a server is preventing access, which command would you use to narrow down where the problem is?
A)nslookup
B)ping
C)traceroute
D)netstat

13. Which of the following when typed in Vi's command mode, saves the file and quits the program?
A):rq
B):wq
C):rp
D):we

14.Where may the Linux root(/) partition reside?
A)On a primary or logical partition
B)On a logical partition only
C)On a primary partition only
D)On a partition that falls below the 1,024th cylinder

15. Where in a network may a network firewall reside?(Choose all that apply.)
A)In the walls between important offices
B)On an individual computer
C)In a router between network segments
D)In expensive network cables

16. Which of the following commands would provide information on programs that are consuming too much CPU time?
A)cat /proc/cpuinfo
B)df
C)top
D)uptime

17. Which of the following commands would allow you to view the last few lines of a file?
A)lastlines
B)bash
C)cp
D)tail

18. Which tool can you use to measure a hard disks speed on a Linux machine?
A)fdisk
B)e2fsck
C)speedtest
D)hdparm

19. Which of the following may be used to create a swap partition?(Choose all that apply)
A)dd
B)mknod
C)Linux fdisk
D)PartitionMagic

20. Which of the following commands will install an RPM package?
A)rpm -Uvh
B)rpm -i
C)rpm -U
D)rpm -e

21. Which of the following is true of public domain and open source software?
A)They're the same thing
B)Both allow free distribution of software
C)Represent opposing philosophies
D)They can not legally appear on the same distribution medium

22. Under which of the following circumstances might you need to edit the /etc/fstab file?
A)A hard disk has been added to the computer
B)A zip disk has been added into the zip drive
C)System performs a disk check and reports no errors
D)/boot/grub/menu.lst boot options has been changed

23. What tool can diagnose and correct many common Linux filesystem problems?
A)mkfs
B)fsck
C)chkdsk
D)scandisk

24. Which programs can be used to load a module?(Choose all that apply)
A)insmod
B)rmmod
C)modprobe
D)depmod

25. Which of the following directories must reside on its own partition.
A)/boot
B)/
C)/home
D)None, it's optional for all directories

Best answer: