Biology, 04.02.2020 00:48, arianna23717
Which of the following distinguishes a prokaryotic cell from a eukaryotic cell? (1 point)
the presence of a nucleus
the presence of a cell membrane
the ability to interact with the environment
the ability to reproduce
Answers: 2
Biology, 22.06.2019 09:30, ssuereichard
You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.
Answers: 1
Biology, 22.06.2019 18:30, ryanbreland14
Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas
Answers: 2
Biology, 22.06.2019 19:00, MelissaSmartypants
Under which of the following circumstances would natural selection not operate on an organism
Answers: 1
Which of the following distinguishes a prokaryotic cell from a eukaryotic cell? (1 point)
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