Search found 26 matches

by klapausius
Fri Feb 11, 2011 1:00 pm
Forum: General Discussion
Topic: NItrogen how many do we have?
Replies: 2
Views: 1614

NItrogen how many do we have?

How many nitrogen atoms on average is present in a single human cell? here are the information that i have found; For DNA; it contains A(6N) G(6N) T(2N) C(3N), human genome = 3 billion bases, G+C= 41%, with these info i can calculate the number of Nitrogen atoms in a cell, For proteins; each amino a...
by klapausius
Thu Oct 14, 2010 3:46 am
Forum: Microbiology
Topic: phototrophs convert to chemotrophs when light is absent?
Replies: 1
Views: 1724

phototrophs convert to chemotrophs when light is absent?

The purple non-sulfer bacteria A.Grow anaerobically as photoorganoheterotrophs B.utilize organic molecules as a source of electrons for photosynthesis C.typically can grow aerobically in the dark as chemoorganoheterotrophs D.all of the above my choice is D. i am quite sure A and B is true. this woul...
by klapausius
Tue Oct 12, 2010 11:50 am
Forum: Molecular Biology
Topic: similar G+C content = similar base seq?
Replies: 1
Views: 1093

similar G+C content = similar base seq?

Do organisms with similar mole percent (G+C) have similar base sequence?
by klapausius
Fri Oct 08, 2010 1:32 pm
Forum: Microbiology
Topic: QuestionS on Taxonomy
Replies: 1
Views: 4888

QuestionS on Taxonomy

i have some question that are bugging me and would like to discuss them here as to get more opinion on my choice, thanx. The melting temperature from two gram positive bacteria was determined and shown to be the same. This would indicate that the bacteria are: 1. The same species 2. Belong to the sa...
by klapausius
Fri Oct 08, 2010 11:23 am
Forum: Microbiology
Topic: chemoautotrophs
Replies: 2
Views: 2658

is there a regulation like that in tryp operon where if the substrate is present it will shut down its autotrophic capabilites?
by klapausius
Thu Oct 07, 2010 2:59 am
Forum: Microbiology
Topic: antibiotic target, toxicity
Replies: 3
Views: 3589

our DNA synthesizing machinery should b different?
cell membrane composition should b similar for eukaryote n prokaryote right since usually just lipids..disrupters should affect both
im not sure of the other options
by klapausius
Wed Oct 06, 2010 2:06 pm
Forum: Microbiology
Topic: chemoautotrophs
Replies: 2
Views: 2658

chemoautotrophs

i do realize that Chemoautotrophs can aquire its carbon source from CO2
however can it aquire its Carbon source from glucose if it was given? or will it stick to Co2 or both?
by klapausius
Wed Oct 06, 2010 3:47 am
Forum: Microbiology
Topic: antibiotic target, toxicity
Replies: 3
Views: 3589

antibiotic target, toxicity

which of the following is likely to have the most toxic side effects to human? a. inhibittors of cell wall synthesis b. inhibitors of protein synthesis c. disrupters of cell membrane structure d. inhibitors of DNA synthesis My choice is c) as both prokaryotes and eukaryotes have cell membrane just w...
by klapausius
Tue Oct 05, 2010 1:32 pm
Forum: Microbiology
Topic: Nutrient Requirements
Replies: 1
Views: 1159

Nutrient Requirements

I plated a colony of S.aureus on a minimal salt agar (l.0g NH4H2P04, 0.5 g K2HPO4, 5.0g NaCl, and 0.2g MgSO4.7H20, pH 7.0) + 0.5% glucose; AND saw no growth on the plate, however using the same minimal agar + 0.5% lactose i was able to grow s.aureus. from this result, i concluded that s.aureus was n...
by klapausius
Sun Oct 03, 2010 10:11 am
Forum: Molecular Biology
Topic: Screening for gene in genomic library
Replies: 1
Views: 1199

Screening for gene in genomic library

A genomic library of human cells can be screened for a gene x using all the following methods except 1) DNA gel probed with gene X DNA probe 2) DNA gel probed with gene x RNA probe 3) Protein gel probed with antibody against the protein x 4) PCR with specific primers against gene x my guess is 3) si...
by klapausius
Sun Oct 03, 2010 8:42 am
Forum: Microbiology
Topic: Compatible solutes
Replies: 1
Views: 2411

Compatible solutes

Microbes use compatible solutes 1) only when living in a hypotonic environment 2) only when living in a hypertonic environment 3) to ensure that cytoplassimc environment is hypertonic 4) to avoid plasmolysis i chose 2) because i believed that in a hypertonic environment microbes would try to maintai...
by klapausius
Thu Sep 23, 2010 12:38 pm
Forum: Microbiology
Topic: Penicillin activity on bacteria in different conditions
Replies: 4
Views: 7132

Re: Penicillin activity on bacteria in different conditions

thank you biohazard, really appreciate yr explaination! now i understand better