Biology
Biology, 09.08.2019 18:20, rebeckas0102

Which of the following observations about a bacterium would distinguish it from the last eukaryotic common ancestor?
a double-stranded dna genome
lack of a membrane-bound structure surrounding the genome
fatty acids in the lipid bilayer of the plasma membrane
enclosed by a cell wall

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Biology, 30.08.2019 13:30, kalbaugh
1. which of the following is always single-stranded? a. messenger rna (mrna) b. double-stranded rna (dsrna) c. dna d. dna and rna (obviously its not b.) 2. which of the following is a difference between dna and rna? a. most types of rna are double-stranded b. rna contains lipids c. they have different sugars d. rna has thymine 3. which of the following bases are found in rna but not in dna? a. uracil b. guanine c. adenine d. cytosine i'm pretty sure 3 is a. but i want to be sure.
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Biology, 03.10.2019 01:30, leothedrifter
Which best describes a difference between prokaryotic cells and eukaryotic dna? a. prokaryotic dna is double stranded; eukaryotic dna is single stranded. b. eukaryotic dna is found in the mitochondria; prokaryotic dna is found in golgi bodies. c. prokaryotic dna is found in the nuclei region; eukaryotic dna is in the nucleus. d. eukaryotic dna is found in the nuclei region; prokaryotic dna is in the nucleus.
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Biology, 06.10.2019 22:30, morrisjillian23
The insulin used to treat people with diabetes is commonly produced by inserting the dna sequence for human insulin into a bacterium. the insulin the bacterium produces using that sequence is then harvested. in fact, dna sequences from virtually any living organism could be inserted into a bacterium and the bacterium would be able to use the sequences to make the same proteins that the original organism did. in what way does this provide evidence for evolution? a. bacteria must be less evolved than higher organisms since they can still make proteins from the dna of other organisms. b. since bacteria are able to use dna from other organisms, they must have evolved from them as a common descendant. c. since the bacterium was changed by adding a foreign dna sequence, the bacterium was able to evolve. d. since the genetic code is the same across species, these species must have inherited it from a common ancestor.
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