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SVETLANKA909090 [29]
3 years ago
12

A person had bread and butter for his breakfast. Trace the changes in the main components of these during its passage through th

e alimentary canal
Biology
1 answer:
Papessa [141]3 years ago
7 0

When the bread and butter is in mouth, mechanical digestion starts. The size of the food gets reduced and it mixes with saliva for easy swallowing. The salivary amylase in saliva begins the digestion of starch in the bread. This is the start of chemical digestion. When the undigested bread and butter reached the stomach, lower esophageal sphincter relaxes and allow the chewed food to enter. The gastric secretions containing HCl, acts on the undigested food to produce chime. HCl kill the microorganism on the food and also denatures the protein and later attacked by digestive enzyme pepsin. Pepsin breakdown protein in the bread, butter . Later on gastric lipase begins to digest fat present in butter. Digestion of the starch in bread does not occur in the stomach because the salivary amylase that began chemical digestion in mouth became inactive in the presence of HCl. Further the chime enters the small intestine where bile secreted by the gall bladder emulsifies the fat and break into small globule which helps in fat absorption.

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To cite a source of information means to _______.
marshall27 [118]

Answer:

C name it as the source of information

5 0
2 years ago
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Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate gr
erica [24]

Answer:

D. Allosteric activator

Explanation:

In an enzyme, the allosteric site is a site/motif different from the active site, (i.e., the site with catalytic activity) which is able to interact with regulatory effector molecules in order to activate or inhibit enzymatic activity by influencing the tridimensional (3D) structure of the enzyme. An allosteric activator is an effector molecule with the ability to bind to a specific enzyme at a different site than the active site, thereby modifying the shape of the enzyme and increasing the affinity of this enzyme for its substrate. Moreover, Adenosine monophosphate (AMP) is a nucleotide composed of a phosphate group, a sugar ribose, and an Adenine (A) base. This effector molecule (AMP) has shown to allosterically stimulate diverse enzymes in physiological conditions (e.g., AMP-activated protein kinase).

5 0
2 years ago
What benefit does an organism gain by only using this method of reproduction?
alexdok [17]

Explanation:

In a stable or predictable environment, asexual reproduction is an effective means of reproduction because all the offspring will be adapted to that environment. In an unstable or unpredictable environment asexually-reproducing species may be at a disadvantage because all the offspring are genetically identical and may not have the genetic variation to survive in new or different conditions. On the other hand, the rapid rates of asexual reproduction may allow for a speedy response to environmental changes if individuals have mutations. An additional advantage of asexual reproduction is that colonization of new habitats may be easier when an individual does not need to find a mate to reproduce.

8 0
3 years ago
Who developed the culturing technique to enrich for a certain population of microbial cells from a complex community based on a
Vikentia [17]

The one who developed the culturing technique to enrich for a certain population of microbial cells from a complex community based on a particular metabolic phenotype of interest is Martinus Beijerinck. The correct option is C.

<h3>What is culturing technique?</h3>

Culture methods involve collecting samples from the field and culturing them to detect the presence of microbes.

The number of microbial species and their influence on corrosion are estimated. Culture media for various microbes have been established.

Culturing is simply the process of growing microorganisms in special media in the laboratory. It entails the preparation of sterile medium, as well as the inoculation, incubation, and examination of microorganisms.

Martinus Beijerinck invented the technique for enriching a specific population of microbial cells from a complex community based on a specific metabolic phenotype of interest.

Thus, the correct option is C.

For more details regarding culturing technique, visit:

brainly.com/question/27865878

#SPJ1

Your question seems incomplete, the missing options are:

A. Frederick Griffith

B. Joseph Lister

C. Martinus Beijerinck

D. Sergei Winogradsky

8 0
1 year ago
In the fruit fly Drosophila, there is a dominant gene for normal wings and its recessive allele for vestigial wings. At another
aev [14]

Answer:

15

Explanation:

The genes for vestigial wings (vg) and purple eyes (pr) are linked on the same chromosome.

<u>The following cross was made:</u>

Heterozygous male for both genes   X female<em> vg pr / vg pr</em>  

The male could be either <em>vg+pr+/vg pr</em> or<em> vg+ pr/vg pr+</em>.

The female only produces <em>vg pr </em>gametes.

<u>The following offspring was observed: </u>

420 Normal wings and red eyes (<em>vg+ pr+/vg pr</em>)

430 Vestigial wings and purple eyes (<em>vg pr / vg pr</em>)

80 Vestigial wings and red eyes (<em>vg pr+ / vg pr</em>)

70 Normal wings and purple eyes (<em>vg+ pr / vg pr</em>)

Total: 1000

The individuals observed in the highest frequency have the parental genotypes. The recombinant individuals are <em>vg pr+ / vg pr</em> and <em>vg+ pr / vg pr.</em>

Distance = Number of recombinants × 100 / Total

Distance = (80 + 70)×100 /  1000

Distance = 15 cM.

<em>Just a small note, male drosophila do not experience crossing over in meiosis, so there would be no recombinants observed from this cross. The problem is probably mixed up, the female should be heterozygous and the male the homozygous recessive.</em>

5 0
3 years ago
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