Why Don’t New Biological Macromolecules Form Abiotically From Nonliving Matter On The Earth Today?

Why don’t new biological macromolecules form abiotically from nonliving matter on the Earth today? The special environmental conditions that are required do not exist. What would you call a long chain of Streptococcus bacterial cells that are spherical in shape?

In which type of conditions are you likely to find methanogenic Archaeans?

Methanogens belong to the domain archaea, which is distinct from bacteria. Methanogens are commonly found in the guts of animals, deep layers of marine sediment, hydrothermal vents, and wetlands.

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What effect would you predict if you applied penicillin to archaea?

What effect would you predict if you applied penicillin to archaea? the archaea would not be affected, since they do not contain peptidoglycan.

Which of the following groups have at least some organisms composed of cells with cell walls?

Which of the following groups contains at least some members that have cell walls? Most bacteria and archaea, and many protists, have cell walls.

Which term defines the genetic recombination in bacteria often makes use of a Pili?

Which means of genetic recombination in bacteria often makes use of pili? photoautotrophs.

In what environments would you expect to find methanogenic archaea and why?

Methanogenic archaea might be able to thrive in some Martian environments and could be a potential biogenic source for the methane in the atmosphere of Mars.

Which of the following is not a similarity that protozoans have to animals?

Which of the following is not a similarity that protozoans have to animals? Protozoans are able to photosynthesize. Which group of protozoans are the causative agent in malaria?

What evidence supports the idea that archaea are more closely related to eukaryotes than to bacteria?

What evidence supports the idea that archaea are more closely related to eukaryotes rather than to bacteria? Archaea and eukaryotes initiate transcription in the same fashion, share some ribosomal proteins, and have similar types of tRNA.

How can viruses be distinguished from eukaryotic and prokaryotic organisms?

Viruses are neither prokaryotic or eukaryotic. Viruses are not made of cells. Viruses cannot replicate on their own. Most scientists do not consider viruses to be living.

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How is latency of animal viruses different from lysogeny of phages?

How is latency of animal viruses different from lysogeny of phages? a. Latency involves enveloped viruses, while lysogeny does not.

Why don t prokaryotic cells have a nucleus?

Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.

What organelle do prokaryotes lack?

Prokaryotic cells are surrounded by a plasma membrane, but they have no internal membrane-bound organelles within their cytoplasm. The absence of a nucleus and other membrane-bound organelles differentiates prokaryotes from another class of organisms called eukaryotes.

Do you agree or disagree that a prokaryotic cell is actually a nucleus that is alive Why and why not?

In prokaryotic cells, a single circular piece of DNA carries genetic material. There is no enclosing membrane, because there is no actual nucleus, but merely a concentration of DNA called a nucleoid. Therefore, prokaryotes can live without a nucleus.

How do bacteria acquire new genetic information?

Like all organisms, bacteria can acquire new traits through mutations. Mutations are any change in the sequence of DNA nucleotides within an organism’s genome. The main cause of mutations are exposure to foreign chemicals or radiation, errors during DNA replication, and from inser- tion or deletion of DNA segments.

What type of mutation alters the base but not the amino acid being coded for?

A silent mutation is a mutation that occurs within the DNA sequence, but does not alter the amino acid sequence. Silent mutations can occur in introns, which are spliced out before translation.

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How are plasmids transferred between bacteria?

Transfer of genetic material occurs during the process of bacterial conjugation. During this process, DNA plasmid is transferred from one bacterium (the donor) of a mating pair into another (the recipient) via a pilus. During wall-to-wall contact of the mating bacteria, DNA transfer takes place.

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