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3 years ago

starch is digested by amylase in mouth, but it is not digested in the stomach. what is the reason for this?

Biology

1 answer:

Step2247 [10]3 years ago

4 0

Answer:

Explanation:

Only about five percent of starches are broken down in the mouth. (This is a good thing as more glucose in the mouth would lead to more tooth decay.) When carbohydrates reach the stomach no further chemical breakdown occurs because the amylase enzyme does not function in the acidic conditions of the stomach.

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A new human species was found on a distant planet, whose genetic inheritance and process of reproduction is identical to that of

Vedmedyk [2.9K]

Answer:

E/e ; T/t ⇒ Square eyes and long tail (Option D)
3/16 will have round eyes and long tails (Option C)
1/4 of the progeny will be heterozygous for both traits (Option A)

Explanation:

Available data:

Two diallelic unlinked genes
Gene E controls eye shape: Dominant allele E expresses square eyes, and recessive allele e expresses round eyes.
Gene T controls the tail size. Dominant allele T expresses long trail, and recessive allele t expresses short tail.

Genotypes Phenotypes

EETT, EeTT, EETt, EeTt Square eyes and Long tail

eeTT, eeTt Round eyes and Long tail

EEtt, Eett Square eyes and Short tail

eett Rounf eyes and short tail.

1. An individual of this new species is heterozygous for gene E and heterozygous for gene T. What is their genotype and phenotype?

The heterozygous individual is E/e ; T/t, expressing square eyes and a long tail.

2. Two individuals, who are both heterozygous for eye shape and tail size, mate. Which of the following is a correct statement about the phenotype ratios expected for their offspring?

Cross: between two heterozygous individuals

Parentals) EeTt x EeTt

Gametes) ET, Et, eT, et

ET, Et, eT, et

Punnett square) . ET Et eT et

ET EETT EETt EeTT EeTt

Et EETt EEtt EeTt Eett

eT EeTT EeTt eeTT eeTt

et EeTt Eett eeTt eett

F1) Genotype:

1/16 EETT
2/16 EETt
1/16 EEtt
2/16 EeTT
4/16 EeTt ⇒ 1/4 EeTt
2/16 Eett
1/16 eeTT
2/16 eeTt
1/16 eett

Phenotype

9/16 E-T-, Square eyes and Long tails
3/16 E-tt, Square eyes and short tails
3/16 eeT-, Round eyes and Long tails
1/16 eett, round eyes and short tail

Phenotypic ratio 9:3:3:1

3. From the mating described in question ABOVE, what proportion of ALL of the offspring in will be heterozygous for both traits?

4/16 = 1/4 = 25% of the progeny are expected to be heterozygous for both traits, EeTt.

7 0

3 years ago

Fatty acid metabolism disorder is an autosomal recessive disorder. Two unaffected parents have 6 children - all of whom are unaf

Nadusha1986 [10]

Answer:

There are only 2 possible genotypes for the mother, FF and Ff.

Explanation:

Because it is an autosomal inheritance, this case F will be the dominant allele and f the recessive allele, where f produces Fatty acid metabolism disorder. If the mother does not possess the disorder, she must possess at least one dominant allele for that specific gene. However, for the other allele, we cannot assure that it is dominant, since it can be recessive and not express itself either in her or in the offspring, because of the father we also only know his dominant allele.

8 0

3 years ago

Which vector contained the infectious agent, Yersinia pestis?

malfutka [58]

Answer:

Yersinia pestis is the causative agent of plague

Explanation:

Rodents, such as rats, carry the disease. It is spread by their fleas.

8 0

3 years ago

Consider the hypothesis below and answer the question that follows.

OverLord2011 [107]

<h2>Answer:</h2>

The correct answer is the option C.

Which is we add equal amount of salt in all the water samples.

<h3>Explanation:</h3>

As in experiment we have to indicate that the boiling point of water increases with the addition of salt.
Now we also know that water contains many salts as compared to the distilled water.
So the boiling points of simple water and distilled water would be bit different.
So we cannot choose one for our experiment. Instead we use all water samples of equal volume adding equal amount of salt in all samples.
Then we will compare results for a net answer/result of experiment.

8 0

3 years ago

A typical leaf is flat and thin. Why is it useful for each leaf cell to be relatively near the surface of the leaf?

boyakko [2]

The outer layer of the skin covering the exterior body surface of vertebrates ... the primary tissue of higher plants composed of thin-walled cells that remain capable of ... a swelling on a plant stem consisting of overlapping immature leaves or petals ... Older xylem near the center of a woody stem that no longer conducts water.

3 0

4 years ago