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Biology

Guest

An atom consists of three types of particles: proton. Electron, and neutron. Each atom of an element has the same number of which type of particle

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Biology

Jacquelyn Robbins

What statement is true of prions?

a) Prions are produced by viruses.

b) Prion diseases can be prevented by cooking your meat.

c) Prions are abnormally shaped proteins that cause spongiform encephalopathies.

d) There are no prion diseases of humans, although there are several examples in animals.

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Biology

Fiona Gilmore

A research team needs an antibody that binds to a human protein of interest so that protein expression can be monitored. They use epitope tagging, adding a sequence of amino acids called an epitope to the protein through DNA recombination. In this way, they do not need to develop an antibody to the protein, but can use a known, commercially available epitope‑specific antibody. However, they are unable to localize the protein using the epitope‑specific antibody. Why did the antibody fail to indicate protein localization? The antibody is removed during RNA processing. The antigen‑binding site does not recognize the antibody. The commercial antibodies the team used were developed from rat tissues. Only the proenzyme contains the added epitope, which is disrupted during activation.

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Biology

Gregory Kidd

True or False Scientists think Cancer begins in something damages a cells proteins

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Biology

Rene Lloyd

Which of the following is true of secondary endosymbiosis? It is indicated by the presence of a double membrane surrounding the endymbiont. An organism containing one endosymbiont engulfs another organism, and that organism becomes an endosymbiont. It is indicated by the presence of a nucleomorph. An organism containing an endosymbiont is engulfed by another organism and becomes an endosymbiont. It is indicated by the presence of a mixotroph.

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Biology

Gabriella James

according to the cladogram which of the following organisms had a segmented bady and jaw, but no limbs

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Biology

Guest

What are the parts of a neutron

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Biology

Marley Baldwin

he researchers bought samples of whale meat-all labeled simply as kujira, the generic Japanese term for whale meat-from markets in Japan and sequenced DNA from these samples. They compared their data with sequences from known whale species. Because subspecies of whales from different populations differ genetically, the researchers were able to analyze the genetic variation in their samples and learn the location from which the whales were likely captured. These results would indicate if illegal whale meat was being sold.

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Biology

Marianna Mcneil

Enzymes do not? they simply speed up reactions that will?

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Biology

Jesus Ellis

Viruses, unlike bacteria, are not composed of of what?

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Biology

Burns

For the catabolite repression control system, what would be the effect on the phenotype of the lac operon of a regulator protein (CAP) that could no longer bind cyclic AMP? It would make the lac operon: a. uninducible b. constitutive c. inducible, but reduced expressiond, repressible e. normal f. none of these

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Biology

Dunce

Which action could lead to foodborne illness from cross-contamination?

a) thawing meat at room temperature

b) failing to quickly refrigerate cut up fruit

c) eating chicken that is not fully cooked

d) chopping meat and vegetables on the same cutting board

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Biology

Alexis Krause

Which of the following conditions would increase the accuracy of a molecular clock?

Choose one or more:

A. The genes encode resistance to antibiotics.

B. The gene sequences are orthologous (have the same function).

C. The organisms have similar generation times.

D. The genes are carried on plasmids

E. Average mutation rates are constant across generations and between organisms.

F. The "clock"genes are highly mobile between species.

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Biology

Guest

Researchers studied mice embryos to determine whether the cells of the ear bones originated from the same embryonic cells as the cells that form the jaw in other vertebrates. Why would the researchers use mice instead of opossums or humans? Do the results from mice tell you something about your own ears? Why or why not?

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Biology

Guest

What would you do if you found an alien in your living room? (Check all that apply.)

Scream

Say hi

Call 911

Offer it a sandwich

Take the remote

Fight it

Kick it out

Give it some clothes

Bribe it to do your homework

Make it take this poll

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