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3 years ago

1. ASSERTION AND REASONING QUESTIONS:

Biology

1 answer:

frozen [14]3 years ago

4 0

Answer:

1) B

2) A

3) A

4) D

Explanation:

An atom is neutral because it contains an equal number of protons and electrons. Though the atom actually contains neutrons, this reason does not explain the electrical neutrality of the atom.

The L shell actually contains eight electrons because the maximum number of electrons accommodated in each shell is given by 2n^2 where n is the principal quantum number. Since the L-shell corresponds to n=2 then the reason is the correct explanation of the assertion.

The valency of atoms is determined by the number of electrons in the outermost shell of the atom. Remember that atoms having a filed valence shell(eight electrons in the outermost shell) have a valency of zero. Hence the noble gases possess a zero valency. Thus the reason is the correct explanation of the assertion.

Nitrogen forms its ion by electron gain and not by electron loss because nitrogen forms an anion. This anion is formed by a gain of three electrons. The assertion is false but the reason is true.

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What is the order of these objects as it occurs in a microscope, beginning with the eye to the specimen on the stage.

AleksAgata [21]

<h2>Order of parts of a microscope </h2>

First – ocular lens

Second – Body tube

Third – Revolving Nosepiece

Fourth – Objective lens

Fifth – Coverslip

Explanation:

Ocular lens: The lens present in the eyepiece at the top of the microscope, close to the eyes, through which a person looks through the microscope to view the specimen. Magnification of ocular lens in a compound microscope is usually 10x

Body tube: The tube that connects the eyepiece with the objective of the microscope for continuous optical alignment.

Revolving Nosepiece: The turret that holds the objective and revolves to select the objective lens according to its magnification

Objective lens: The objective lens is located above the specimen rack. Objective lens creates the primary image of the specimen viewed through the eyepiece. A single compound microscope can have more than two objective lens and their magnification ranges from 4x, 10x, 40x, 100x power.

Coverslip: The cover glass which covers the objective lens and prevent from touching the specimen . This is the object directly above the specimen.

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3 years ago

How would decerasing the time it takes you to run a certain distance affect your speed ?

dmitriy555 [2]

It would mean you are moving faster than you already were.

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3 years ago

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What should be the genotypes of the parent flowers (P generation) if he wants to ensure that all of the

garri49 [273]

Answer:

If the trait for tall and trait for yellow are recessive: ttyy and ttyy

If the trait for tall is dominant and trait for yellow is recessive: TTyy and TTyy, Ttyy and TTyy

If the trait for tall is recessive and trait for yellow is dominant: ttYY and ttYY, or TtYy and TTYY

If the trait for tall is dominant and trait for yellow is dominant TTYY and TTYY, or TtYy and TTYY

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Next, you explored mutations by transcribing and translating mutated versions of that original gene. When you transcribed and tr

umka2103 [35]

Answer: hello some details relating to your question is missing below is the missing detail

DNA Sequence= 3’ - TACTAGTTGTGCATT - 5’

Complementary Sequence=5`-ATGATCAACACGTAA-3`

Answer : MINT

Explanation:

The protein ( sequence of amino acids ) that resulted from your Translation is MINT

The m-RNA Produced form the information above is:

5`-AUGAUCAACACGUAA-3`

While the Protein Sequence is Met-Ile-Asn-Thr which can be written as MINT

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3 years ago

In a certain group of African people, 4% are born with sickle-cell disease, an autosomal recessive disorder. Heterozygous indivi

love history [14]

Answer:

the correct answer is C) 32%

Explanation:

Sickle-cell anaemia is an autosomal recessive genetic disorder. Individuals with the homozygous recessive have sickle-shaped blood cells. Whereas, individuals with heterozygous are only carrier of sickle cell trait. The carrier individuals are resistant to malarial parasite and do not have malaria.

As per the question, 4% of an African population is born with sickle-cell disease, then the percentage of the population is heterozygous and resistant to malaria will be:

Hardy-Weinberg formula is equilibrium,

p² + 2pq + q² = 1

p = frequency of the dominant allele in the population

q = frequency of the recessive allele in the population

p2 = percentage of homozygous dominant individuals

q2 = percentage of homozygous recessive individuals

2pq = percentage of heterozygous individuals

Given, homozygous recessive for this gene (q2) is 4% which is 0.04, the square root (q) is 0.2 (20%) then p should be 1-0.2 = 0.8 (20%).

Thus, the frequency of heterozygous individuals = 2pq.

2 (0.8 x 0.2) = 0.32 (32%).

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3 years ago