Search found 12 matches

by maccha
Sat Jun 25, 2011 4:33 am
Forum: Cell Biology
Topic: Are red blood cells alive?
Replies: 3
Views: 19914

Are red blood cells alive?

I'm reading about the criteria for life and how each of our individual cells are living. Since red blood cells do not fulfill all the criteria for life (do not reproduce) are they still considered alive?
by maccha
Thu Mar 04, 2010 1:27 am
Forum: Molecular Biology
Topic: Dideoxy DNA sequencing?
Replies: 6
Views: 2893

Re: Dideoxy DNA sequencing?

Okay there's something I'm not understanding here and I'll probably feel really stupid in a minute. I thought the dideoxy nucleotides were tagged with different colours you could see under a microscope- so then I thought, why not tag the regular nucleotides and look at the colour sequence from there?
by maccha
Wed Mar 03, 2010 12:04 am
Forum: Molecular Biology
Topic: Dideoxy DNA sequencing?
Replies: 6
Views: 2893

Re: Dideoxy DNA sequencing?

Couldn't you just look at the different fluorescent colours and see it from there?
by maccha
Mon Mar 01, 2010 4:23 am
Forum: Molecular Biology
Topic: Dideoxy DNA sequencing?
Replies: 6
Views: 2893

Dideoxy DNA sequencing?

So I understand that fluorescent markers are attached to each of the dideoxy nucleotides and then the DNA fragments are aligned and read to determine their sequence.. why not attach fluorescent markers to the regular nucleotides and then be able to read the sequence straight from there?
by maccha
Sun Feb 28, 2010 8:58 pm
Forum: Cell Biology
Topic: Sex-linked traits question
Replies: 0
Views: 1674

Sex-linked traits question

In biology we've been learning about how females must be homozygous for a sex-linked recessive trait in order for it to be expressed, since they have two X chromosomes. Then, though, we learned about Barr bodies and how one X chromosome generally gets inactivated.. How can you say a female is hetero...
by maccha
Thu Dec 17, 2009 5:34 am
Forum: Cell Biology
Topic: Why do methanogens produce methane?
Replies: 1
Views: 1789

Why do methanogens produce methane?

Doesn't this just cost them energy and they excrete it? What's the motivation?

Also how do chemolithotrophs get NADH?
by maccha
Sun Dec 13, 2009 5:40 am
Forum: Cell Biology
Topic: Cellular respiration question
Replies: 5
Views: 3902

Cellular respiration question

My biology notes define aerobic respiration as when oxygen is used as a terminal electron acceptor.
What I'm wondering is that can oxygenic photophosphorylation, using NAPH as a terminal electron acceptor, still be considered aerobic respiration?
by maccha
Sun Dec 13, 2009 5:09 am
Forum: Cell Biology
Topic: Photosynthesis question
Replies: 6
Views: 2459

Re: Photosynthesis question

Ooh makes sense, thanks!
by maccha
Sun Dec 13, 2009 4:12 am
Forum: Cell Biology
Topic: Photosynthesis question
Replies: 6
Views: 2459

Photosynthesis question

If plants cells can get ATP from oxidizing water why do they have to make glucose?
by maccha
Tue Oct 13, 2009 5:28 am
Forum: Molecular Biology
Topic: Does DNA encode for tRNA?
Replies: 15
Views: 12176

Does DNA encode for tRNA?

My textbook says that DNA encodes for tRNA. Doesn't it just encode for proteins?
by maccha
Sat Oct 10, 2009 10:17 pm
Forum: Molecular Biology
Topic: Growth curve for bacteria- exponential phase
Replies: 4
Views: 3637

Re: Growth curve for bacteria- exponential phase

Well I'm assuming it wouldn't.. but I don't really know why. Basically what my reasoning has been is that the bacteria can only consume a max amount of lactose at a time.. so if you put more in it would go for longer but not be able to consume more at a time. But my text says that rates of exponenti...
by maccha
Sat Oct 10, 2009 7:09 pm
Forum: Molecular Biology
Topic: Growth curve for bacteria- exponential phase
Replies: 4
Views: 3637

Growth curve for bacteria- exponential phase

We were given a question in biology I'm very confused about. So assume a certain type of bacteria consumes only lactose as their source of energy- if you put these bacteria into a medium with a certain amount of lactose and then transferred it to another medium with double the amount of lactose how ...