All categories

3 years ago

1. How does a basic stain work? microbiology

Biology

2 answers:

LekaFEV [45]3 years ago

6 0

Answer:

In a simple stain, dyes that are either attracted by charge (a cationic dye such as methylene blue or crystal violet) or repelled by charge (an anionic dye such as eosin or India ink) are added to the smear. Cationic dyes bind the bacterial cells which can be easily observed against the bright background

Explanation:

SCORPION-xisa [38]3 years ago

4 0

Answer:

Explanation:

such as methylene blue, Gram safranin, or Gram crystal violet are useful for staining most bacteria. These stains will readily give up a hydroxide ion or accept a hydrogen ion, which leaves the stain positively charged.

You might be interested in

Where does translation take place? hints where does translation take place? endoplasmic reticulum golgi apparatus ribosome nucle

dybincka [34]

Translation is the second process in the central dogma of biology. It involves decoding the mRNA strand (messenger RNA) into a polypeptide chain. The whole process generally occurs in the cytoplasm. The translation process happens in the ribosomes. The ribosomes translate the mRNA strand.

6 0

3 years ago

What evidence suggests that the first tetrapods were amphibians?

Inessa05 [86]

Becuase they were fully aquatic unlike tetrapods today

6 0

3 years ago

Phenylketonuria (PKU) is a disease caused by a recessive mutation. PKU is extremely common in Ireland, affecting approximately 1

aleksklad [387]

Answer:

97%

Explanation:

PKU is caused by a recessive mutation, which means that affected individuals are homozygous and recessive (tt).

The frequency of genotypes according to Hardy-Weinberg equilibrium is:

$TT= p^2\\Tt=2pq\\tt=q^2$

where p is the frequency of the T allele and q is the frequency of the t allele.

Affected individuals are 1 in 4500, which means the frequency of tt genotype is 1/4500.

If the population is in Hardy-Weinberg equilibrium,

$q^2=1/4500\\q=\sqrt{1/4500} \\\\q=0.015$

The sum of the allele frequencies adds up to 1, therefore:

p + q = 1

p= 1 - q

p= 1 - 0.015

p= 0.985

The frequency of the TT genotype (homozygous wild-type individuals) will be:

$p^2=0.985^2\\p^2=0.97$

97% of the population will have the homozygous wild-type TT genotype.

3 0

3 years ago

While eating a picnic lunch in the woods, Jana is frightened by the

Sladkaya [172]

Answer:

The correct answer is option c. the sympathetic and parasympathetic nervous systems.

Explanation:

The parasympathetic nervous system is the one that controls involuntary functions and acts. It also causes or maintains a body state of rest or relaxation after an effort or to perform important functions such as digestion.

The sympathetic nervous system is the one that controls visceral reactions and reflexes, that is, it controls how our body responds to a threatening situation, as is the case in the example.

Both systems make up the autonomic nervous system which is in charge of controlling the involuntary functions of our body.

7 0

3 years ago

When assessing a client's fluid and electrolyte status, the nurse recalls that the regulator of extracellular osmolarity is what

bonufazy [111]

When assessing a client's fluid and electrolyte status, the nurse recalls that the regulator of extracellular osmolarity is sodium.

<h3>What is osmolarity?</h3>

Osmolarity is the measure of the amount of solute present in a solution.
It is also known as osmotic concentration.
It is expressed as Osmol/liter or OsmL.
Osmolarity determines the extent to which a particular solution is concentrated.

Thus, when assessing a client's fluid and electrolyte status, the nurse recalls that the regulator of extracellular osmolarity is sodium.

Learn more about osmolarity here: brainly.com/question/13895898

#SPJ4

4 0

1 year ago