Why don't cyanobacteria and bacteria reproduce by mitosis? A. Because they are not organisms
B.they are not cells
C.they do not contain chromosomes
D.all of the above

Answers

Answer 1
Answer: they do not contain chromosomes 

Related Questions

The mitochondria a. Are the sites of oxidative phosphorylation. b. Are a prominent structure in prokaryotic cells.c. Possess their own DNA. d. Are sites of ATP production.
Approximately 99% of the microbes in the intestines are obligate anaerobes. We have plenty of blood vessels that can bring oxygen to the tissues of the intestines. Why would there be obligate anaerobes within these areas? A. The bacteria in the intestines are protected from exposure to the oxygen in the tissues by the lining of the intestines. B. The bacteria consume all the oxygen in the tissue areas brought by the blood vessels, creating an anaerobic environment. C. While the blood vessels supply oxygen to the tissues of the intestines, the inner area where the bacteria reside is NOT supplied with blood/oxygen. Since it's deep within our bodies, there's no chance for oxygen to get into these inner areas of the intestinal tube, creating a highly anaerobic environment. D. The aerobic microbes are outcompeted for nutrients in these areas by the anaerobic microbes.
Why are bacteria such as Rhizobium and cyanobacteria so important in thenitrogen cycle?A. They return nitrogen gas to airB. They fix atmospheric nitrogen gas for the food chain C. They decompose dead plants and animalsD. They build protein in plants
Is a fox is a herbivore, carnivore,omnivore?
Why is it important to classify living organisms?A) The DNA of organisms may be more easily to analyzeB) organisms may survive longer if they are classifiedC) scientist may study and discuss organisms more easilyD) classifying is needed before a scientist may make observations

Which type of neuron is completely contained within the CNS?

Answers

Answer:

Interneuron

Explanation:

Interneuron is association neuron or connector neuron. Which is completely contained within CNS. Usually conveys messages between parts of the system. Dendrites, axons, may be long or short.

I hope this helped. I am sorry if you get this wrong.

The answer is absolutely C

You work in a laboratory that studies the molecular biology of tribbles. [Although tribbles are an alien life form, assume here that the molecular biology of tribbles is identical to that of eukaryotes on Earth.]Your lab has a genomic library of tribble DNA, as well as a cDNA library made with mRNA extracted from whole tribbles. The lab also has a collection of live tribbles that can be used to isolate RNA or DNA, and a supply of fixed tribbles that can be stained for gene expression.Your advisor provides you with a cloned 100 bp DNA fragment that represents part of the protein-coding region of a tribble gene. Using the tools described in the previous paragraph and the molecular biology techniques we have discussed in class, how would you accomplish each of the following aims? Note: try to come up with the simplest and modest direct approach that will give you the desired information.A. Determine the amino acid sequence of the complete protein produced by that gene.B. Determine whether or not the gene contains introns.C. Determine whether the RNA produced by that gene experiences alternative splicing.D. Determine the length of the mature mRNA(s) produced by the gene. This includes the UTRs and the poly-A tail.E. Determine which cells in the tribble body do and do not express mRNA from this gene.F. You discover a blood stain in the lab, and you want to determine whether it is human blood or tribble blood. How can you do this using the molecular biology tools described above?

Answers

Answer:

Explanation:

A) to determine amino acid sequence of the protein produced by that gene. We will use cDNA library, we will hybridize given part of DNA sequence ( as this part only contains exon part). Than we will isolate the hybridize part and translate this sequence using generic coding table.

B) for determine presence or absence of introns in gene used isolated cDNA in first question. Now we will add this cDNA to DNA library. Here cDNA due to complementary mature binds with DNA. If cDNA binds completely with gene with out looping part of gene it shows that gene is having only exons .

And if along with hybridization part some looped part present in between-- it shows both exons and intron are present.

C) for determining alternative splicing we will use cDNA library.

d) to determine length of mature mRNA which includes both the UTR and poly A sequence we will go for cDNA cloning and look for particular cDNA complementary to DNA segments. And later we isolate that cDNA and examine its whole length

E) to determine which cells in the tribble body express this particular mRNA . We use fluorescent tagged small DNA part provided. Then we will add this DNA probe to supplied tribes. The cells which are expressing , will have cDNA will bind to probe and florescent can be detected. Cells which are not expressing that gene, here probe will not bind and no fluorescence.  

F) to determine that whose blood strain is this. We will do VBTR profiling . Which VNTR profiling similar to belief stain help to determine which blood stain is this.

Which characteristics of DNA polymerase I raised doubts that its in vivo function is the synthesis of DNA leading to complete replication?

Answers

The question is incomplete. The complete question is as follows:

Which characteristics of DNA polymerase I raised doubts that its in vivo function is the synthesis of DNA leading to complete replication?

its composition of a single polypeptide chain.

deficiency of enzyme in some organisms that are still capable of DNA synthesis.

requirement of Mg2+ presence in order for the enzyme to work.

low stability under normal physiological conditions.

Answer:

Deficiency of enzyme in some organisms that are still capable of DNA synthesis

Explanation:

The DNA polymerase I may be defined as the important enzyme that play an important role in the DNA replication of prokaryotes. DNA pol I is the replicating enzyme, DNA repair enzyme and can also acts as the exonuclease.

DNA pol I has been studied invitro and Arthur Korenberg explain the discovery of the DNA pol I. This DNA pol I plays an important role in DNA repair rather than the replication process. This explained invivo by the fact that some in some organisms the deficiency of this enzyme do not halt the process of replication. If the DNA pol I acts as the main replaicating enzyme, the DNA synthesis must be stopped in the organisms that lack DNA synthesis.

Thus, the correct answer is option (2).

Scientists construct an experimental bacteriophage that is composed of the T2 phage protein coat and T3 phage DNA. If a bacterium is infected by this phage, the new phages produced would be expected to have:

Answers

T4 protein and T4 DNA

Explanation:

  • A bacteriophage is an infection that attacks bacteria. At the point when the tail strands identify an objective host the bacteriophage  to the cell, injected  its DNA, and utilizations the microscopic organisms' apparatus to reproduce.
  • T4 is a sort of bacteriophage that infects of  E. coli.  
  • The bacteriophage T4 capsid is a prolonged icosahedron,120 nm long and 86 nm wide, and is worked with three essential proteins such as  gp23*, which shapes the hexagonal capsid cross section, gp24*, which structures pentamers at eleven of the twelve vertices.
  • gp20, which frames the extraordinary dodecameric entry vertex through which DNA.  
  • T4 DNA Ligase is ligation catalyst which utilized the parts of DNA by the catalyzing between  compared 5'phosphate and 3' hydroxyl endsand phosphodiester bonds in the double stranded DNA  utilizing ATP as a coenzyme.

Why can’t bears , tigers and lion live together

Answers

Because they would kill each other

Answer:

Bears, lions, and tigers all are predators that have similar hunting habits such as medium to large prey. Because of this, if they were living in the save environment, they would be competing for food and space. This would cause them to attack and kill off each other until one remained. That or the other two species would be driven out of the area.

Explanation:

Kane how is co-evolution of symbiotic prokaryotes with eukaryotes similar and different to co-evolution in parasite-host systems?

Answers

How co-evolution of symbiotic prokaryotes with eukaryotes similar and different to co-evolution in parasite-host systems is that co existing has provided a sense of advantage with in the environment. One example of this are the parasites. There are different kinds of symbiotic relationships and this shows how similar and different co-evolution is. Hope this helps.