Cell Biology

Cellular respiration

Cellular respiration

Getting the fumarate or alpha-ketoglutarate into the cytoplasm would require expenditure of PMF, but we can also think of this as ATP expenditure (10 protons used for transport is 10 protons not available for driving ATP production). What ATP-cost re

Defiledxhalo   1328   3 Replies

bio_man

Animal cells can take up sucrose against its concentration gradient using a Na+/sucrose ...

Animal cells can take up sucrose against its concentration gradient using a Na+/sucrose ...

Animal cells can take up sucrose against its concentration gradient using a Na+/sucrose symporter....?
Indicate if the following statements are true or false.

A. In the Na+/sucrose symporter, Na+ is also moving against its concentrati

jutt   7813   1 Reply

star

Nucleotide pairs and supercoiling

Nucleotide pairs and supercoiling

I have a picture of a supercoiled plasmid molecule, the best way to describe is there are 4 circles linked to each other (not sure if/how to add the picture)

I need to know how many nucleotide pairs would be disrupted if this molecule adop

Sara   1521   6 Replies

padre

eukaryotes mRNA transcription

eukaryotes mRNA transcription

Which one of the following statements about mRNA transcription and processing in eukaryotes is incorrect?

1. A methylguanosine cap is added to the 5' end of each transcript.
2. All transcription occurs in the nucleus.

chang190   1608   N/A

chang190

Protein A is a flavoprotein with a redox potential of -0.2 V. Protein B is a cytochrome with a redox ...

Protein A is a flavoprotein with a redox potential of -0.2 V. Protein B is a cytochrome with a redox ...

Protein A is a flavoprotein with a redox potential of -0.2 V. Protein B is a cytochrome with a redox potential of +0.1 V.
a. Draw the half-reactions for each of these two electron carriers.
b. Give the reaction that would occur if one wer

MXATC   1449   3 Replies

bio_man

If three ATPs are formed for each pair of electrons removed from substrate, can you conclude that ...

If three ATPs are formed for each pair of electrons removed from substrate, can you conclude that ...

The drop in  Go of a pair of electrons is -52.6 kcal/mol, and the  Go of ATP formation is +7.3 kcal/mol. If three ATPs are formed for each pair of electrons removed from substrate, can you conclude that oxidative phosphorylation is only 21.

MXATC   1100   1 Reply

bio_man

What will be the phenotypic sex of a human with the following gene or chromosomes or both and WHY?

What will be the phenotypic sex of a human with the following gene or chromosomes or both and WHY?

What will be the phenotypic sex of a human with the following gene or chromosomes or both and WHY?
a. XY with the SRY gene deleted-
b. XY with the SRY located on an autosomal chromosome-
c. XX with a  copy of SRY gene on an autos

Babygal   10127   2 Replies

Babygal

The F1 progeny of cross 1 were allowed to interbreed and the resulting F2 progeny are shown in the t

The F1 progeny of cross 1 were allowed to interbreed and the resulting F2 progeny are shown in the t

Cross 2

The F1 progeny of cross 1 were allowed to interbreed and the resulting F2 progeny are shown in the table below.
Phenotype Number

Red-eyed male  362
Red-eyed female  384
Scarlet-eyed male  14

Sara   5883   N/A

Sara

Alternative splicing

Alternative splicing

Alternative splicing provides a means for a larger __________ without a resulting increase in the __________.

1. genome; proteome
2. number of genes; genome
3. proteome; genome
4. mature transcript; gene
5. number o

chang190   898   1 Reply

bio_man

micro

micro

What is the difference between a simple stain, special stain, and a differential stain and give some examples.

oceansweet   682   1 Reply

star

microbio please help

microbio please help

Identify types of growth patterns in broth.

Match the following:

1. E. Coli
2. B. subtilis
3. P. aeruginosa

A. Obligate aerobes
B. Microaerophiles
C. Obligate anaerobes
D. Facultative anaerobe

oceansweet   755   1 Reply

bio_man

How to make a cell membrane model? Due Friday?

How to make a cell membrane model? Due Friday?

I am in AP Biology and we need to make a model of a fluid mosaic model (cell membrane) that includes:

1. Phospholipid bilayer
2. Integral proteins
3. Peripheral proteins
4. Gated channels
5. Protein Pumps

We

mariahneu   17396   5 Replies

bio_man

DNA sequence

DNA sequence

Is it possible to translate RNA in vitro using cell-free preparations obtained from E. coli lysates. Under certain artificial experimental conditions, an initiator methionine codon is not required and translation can initiate with any amino acid.&nbs

trixter47   833   1 Reply

bio_man

Genetics

Genetics

HELP Needed, not sure where to start with these questions.

The scarlet gene of the fruit fly Drosophila melanogaster is involved in the mechanism of eye pigmentation. A true-breeding scarlet-eyed female fly was crossed with a true-breedin

Sara   810   1 Reply

bio_man

Chromosome theory of inheritance

Chromosome theory of inheritance

why are crosses (i.e. the experiments of Mendel) and the microscopic observations of chromosomes during mitosis and meiosis were both needed to deduce the chromosome theory of inheritance

element41skater   2205   1 Reply

bio_man

tRNA help

tRNA help

A single base substitution in the anticodon loop of one of the tRNAs for glycine (tRNAgly) can hypothetically generate a mutant tRNA that is able to suppress translational termination by causing insertion of a glycine residue at certain termination c

trixter47   848   1 Reply

bio_man

DNA size

DNA size

An M. xanthus cell is about 1 uM x 3 uM and its circular genome contains 9 x 106 bp.  Cultures of M. xanthus can reach densities if 109 cells/ml (1 ml = 1 cm3).  If you were to take all the DNA molecules from all the cells in 1 ml of such a

trixter47   679   1 Reply

bio_man

E coli Conjugation

E coli Conjugation

What will the result of conjugation between E. coli strain 1 ( F- : leucine -,histidine -,) and strain 2 (F+ ;leucine +, histidine +)?

a.1 will become F-, leucine +, histidine + ,2 will remain the same
b. 1 will become F+, leucine -,

timorito   850   1 Reply

sarah!

Chromosomal Variance

Chromosomal Variance

An individual fly is heterozygous for two gene orders on the members of a pair of homologous chromosomes (where X represnts the centromere) one member is
A B C D E X F G H I J
If one of the products of crossing over between genes C and D is

timorito   698   1 Reply

sarah!

regulation of enzymes

regulation of enzymes

if an organism needs to regulate activity of enzymes, give one example where it would make more sense to modify the enzyme in a way that you could switch it on or off. come up with another example where it would make more sense for you to modify how

simmyk16   1076   2 Replies

sarah!

DNA Translation

DNA Translation

A single base substitution in the anticodon loop of one of the tRNAs for glycine (tRNAgly) can hypothetically generate a mutant tRNA that is able to suppress translational termination by causing insertion of a glycine residue at certain termination c

Octoshark   957   2 Replies

bio_man

Bacteria

Bacteria

two different strains of a mutant phage infect a single bacterium. one phae is d- and the other e-. some of the progeny are genotype d+e+ and some are d- e-. what genetic phenomenon does this demonstrate?
a.complementation
b.specialized tra

timorito   643   1 Reply

bio_man

Length of DNA

Length of DNA

An M. xanthus cell is about 1 uM x 3 uM and its circular genome contains 9 x 10^6 bp. Cultures of M. xanthus can reach densities if 10^9 cells/ml (1 ml = 1 cm^3). If you were to take all the DNA molecules from all the cells in 1 ml of such an M. xant

Octoshark   861   3 Replies

bio_man

Genetics

Genetics

6. Assume that the height of tobacco plants is controlled by five genes. Two different alleles exist for genes A, B, C, and D, but only one allele for gene E is present in the population. The effect of each genotype on height is listed below. Total h

Babygal   855   1 Reply

karim89

more true and false

more true and false

True or False...

1. Rifamycin is not useful in the treatment of mycobacteria that cause tuberculosis because it cannot penetrate infected tissues and abscesses.

2. Chloramphenicol is recommended for treatment of bacterial infect

oceansweet   871   1 Reply

bio_man

From where 24 hydrogen in aerobice respiration if the one glucose have just 12 hydrogen from the ...

From where 24 hydrogen in aerobice respiration if the one glucose have just 12 hydrogen from the ...

From where 24 hydrogen in aerobice respiration if the one glucose have just 12 hydrogen from the beging?   

king0079z   727   1 Reply

bio_man

What is DOC agar?

What is DOC agar?

Desoxycholate Agar is considered Selective and Differenctial culture media. Describe the chemical features that make DOC agar:

Selective for Gram Negative Cell survival?

Differential? (2 differences)

mai   2052   1 Reply

bio_man

Difference between meiosis and mitosis

Difference between meiosis and mitosis

What are the differences between meiosis and mitosis?
Also what are key terms i should know.
Thanks!

SchoolHelpPrettyPlease   1461   2 Replies

bio_man

nucleic acid synthesizing enzyme

nucleic acid synthesizing enzyme

A DNA-dependent, DNA-synthesizing 
B RNA-dependent, RNA-synthesizing 
C RNA-dependent, DNA-synthesizing 
D DNA-dependent, RNA-synthesizing 

 1.Primase
2. DNA polymerase I
3.DNA polymerase

chang190   882   1 Reply

bio_man

myosin and kinesin

myosin and kinesin

I know this is a long question, but if anyone could help me I will greatly appreciate it!

Part 1 which of the following are true for myosin

1. each myosin head has a binding site for actin and ATP
2. during muscle contracti

nickname   8538   4 Replies

duddy

micro true and false

micro true and false

True and False...

1. The inappropriate use of antibiotics, while a problem in third-world countries, is not a significant cause of antibiotic resistance in the US.

2. Gram-negative bacteria are generally more resistant to antibi

oceansweet   1027   2 Replies

oceansweet

Penicillin was considered a "miracle drug" for all of the following reasons except

Penicillin was considered a "miracle drug" for all of the following reasons except

1. Penicillin was considered a "miracle drug" for all of the following reasons except

 a. It is produced by a mold

 b. It does not affect eukaryotic cells

 c. It is active against many gram-positive bacteria

oceansweet   4164   1 Reply

bio_man

microfilament vs. microtubule

microfilament vs. microtubule

which of the following apply to microtubules, which to microfilaments and which to both?
1. all the nucleotide-binding sites point the same direction
2. monomers bind GTP
3. dimers polymerize into protofilaments that they associate sid

nickname   9315   2 Replies

nickname

An allele for purple flowers is co-dominant with the allele for pink flowers...

An allele for purple flowers is co-dominant with the allele for pink flowers...

An allele for purple flowers is co-dominant with the allele for pink flowers. The heterozygous phenotype is a purple and pink flower known as a sunset flower. Gene 2 codes for thorns (T) or no thorns (t). If a homozygous thorned sunset flower is cros

momof1   1936   3 Replies

bio_man

A male hemophilic wants to marry and have children but is concerned...

A male hemophilic wants to marry and have children but is concerned...

Hemophilia is an X-linked recessive disorder. A male hemophilic wants to marry and have children but is concerned about passing this disease to the offspring. Conduct three crosses with the three possible genotypes present in women listing the F1 phe

momof1   1394   2 Replies

momof1

microbiology

microbiology

Which of these is an oxidizing agent?

 a. ozone

 b. hydrogen peroxide

 c. iodine

 d. chlorine

 e. all of above

oceansweet   1324   2 Replies

momof1

Which one of the following statements about DNA replication in E. coli is correct?

Which one of the following statements about DNA replication in E. coli is correct?

Which one of the following statements about DNA replication in E. coli is correct?

1. RNA primers are necessary because DNA polymerase cannot start a new strand.
2. Only the lagging strand contains one or more RNA primer(s).
3.

chang190   835   2 Replies

momof1

Chromatin

Chromatin

Which of the following statements about chromatin is correct?

 1. Chromosomes are replicated during M phase.
2.  The 30nm fiber is the form DNA is found in during transcription.
3. Heterochromatin is only found at the peri

chang190   827   2 Replies

momof1

micro

micro

Which of the following treatments is most effective for pasteurization?



 a. 72°C for 15 sec.

 b. 140C for 4 sec

 c. These are equally effective

oceansweet   841   2 Replies

momof1

Which of the following are functions of the cytoskeleton?

Which of the following are functions of the cytoskeleton?

which of the following are functions of the cytoskeleton?

1. assist in cellular movement
2. maintains the shape of the cell
3. provides the structural support system for the movement of organelles in the cell
4. forms the ce

nickname   1969   3 Replies

momof1