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ludmilkaskok [199]
3 years ago
9

A scientist observes some cells under a compound microscope and needs to determine if they are bacteria or yeast. Aside from siz

e, what chemical compounds (not organelles!) would positively identify the cell as either a bacterium or a yeast?
Biology
2 answers:
Pie3 years ago
6 0

Answer:

Peptidoglycan and chitin.

Explanation:

Bacteria and yeast differ from each due to the different chemical composition of their cell wall.

Chitin: chitin is a large structural polysaccharide that is derived from chains of modified glucose. It is the primary components of cell wall in fungi such as yeast. Chitin is a minor component in the yeast cell wall, it accounts for only 1-2% of the cell wall dry mass. Chitin contributes to the mechanical strength of the cell wall.

Peptidoglycan: Peptidoglycan also known as murein is a polymer that makes up a the cell wall of a bacterium. It is composed of sugars and amino acids. A bacteria is a unicellular organism, therefore Peptidoglycan gives strength to the outer structure of the organism.

djyliett [7]3 years ago
5 0

Answer:

chitin and murein

Explanation:

The chemical compounds that distinguish bacteria cell from yeast cell are  

chitin and murein

Chitin is a polysaccharide present in the exoskeleton of fungi made up of chains of modified glucose known as N-acetylglucosamine. N-acetylglucosamine is derived from glucose

While murein is a mesh like structure made up of sugar and amino acids. Murein forms a layer outside the plasma membrane of bacterial cell.  

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3 years ago
Would plants grow via hydroponics in an atmosphere with no oxygen, if the water is continuously oxygenated? Why?
HACTEHA [7]

Answer:

"Growers using organic soils will never concern themselves with supplying oxygen to their plants; however, hydroponic growers like me must be well versed in the science of dissolved oxygen (from here on out called DO). While most crops seem to prefer about 9 PPM DO, some crops like lettuce have demonstrated little to no difference in fresh weight or dry weight when grown in DO levels ranging …"

Explanation:

6 0
4 years ago
Which of the following separates the DNA strands during replication
aniked [119]

Answer:

I think it's b not sure though

3 0
3 years ago
In 1918, the Russian Tsar Nicholas II was deposed, and he and his family were reportedly executed and buried in a shallow grave.
GaryK [48]

Answer:

By making a paternity test by Short tandem repeats, or STRs (microsatellites).

Explanation:

Short tandem repeats, or STRs, are microsatellites consisting of repeated sequences of 2 to 6 base pair length monomers  in tandem, and most of them have a high degree of polymorphism. Half of an individual microsatellites are inherited by each parent, and they can be assesed by PCR amplification and further electrophoresis.

In this case, you would try to recover a bone from the remainings of the woman, the Tsar and his wife, since the rest of the latest were in a shallow grave with many different individuals. Preferably, you should manipulate this samples in an ancient DNA facility (aDNA) with proper techniques. You clean the bone samples, drill them, and from internal bone powder make a DNA extraction. After this, you perform a series of PCR targeting a panel of STRs, and electrophoresis. If the woman claim is true, half of her microsatellites should have correspondence with the Tsar, and half with the ones of his wife.

4 0
4 years ago
Which molecules contain (c) cytosine
xxTIMURxx [149]

Answer:

B. Both DNA and RNA  molecules

Explanation:

Both DNA and RNA contain adenine (A) and guanine (G) and, cytosine (C).

But, DNA contains thymine (T), whereas in RNA, it's replaced with uracil (U).

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