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muminat
3 years ago
15

Select the correct answer.

Biology
1 answer:
den301095 [7]3 years ago
6 0

Answer:

B

Explanation:

That is because at outside the host cell, virus crystalline and exist as non-living thing.

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Tall plants are dominant over short plants. One parent is homozygous dominant and the other is heterozygous for plant height.
Greeley [361]

Answer:

a. all tall

Explanation:

If genotypically one of the parents is homozygous dominant and another one is heterozygous for plant height then phenotypically all their progeny will be tall.

Let us suppose, 'T' represents dominant allele and 't' represents recessive allele. Then the genotype of one parent who is homozygous dominant will be TT and genotype of another parent  who is heterozygous will be Tt.

The cross is depicted in the attachment.

Here it may also be noted that genotypically two of the progeny will be homozygous dominant while two of the progeny will be heterozygous but phenotypically all the progeny will be 'tall'.

7 0
2 years ago
Read 2 more answers
You are doing an experiment and plated E. coliin different medias. Media A has onlyglucose, B has only lactose, and media C has
krek1111 [17]

Answer:

A. Glucose:

As lactose is absent will follow the glucose metabolism, so the lac repressor will hold tightly with the operator which leads to the prevention of transcription as RNA polymerase can not bind to promoter so no lactose metabolism.

B. lactose:

In the case or wild mutant lactose metabolism will occur as lactose is present, allolactose binds to the lac repressor thus the operator and promoter are free so transcription starts.  The same result will be in all test except in the case of a mutant repressor.

C. glucose and lactose:

In this case, diauxic growth will occur. This growth takes place when two sugars are present in the media. The preferred sugar will be consumed first That is glucose. Then a lag phase will come which will be followed by the second sugar metabolism that is lactose.  the given two cases :

Lactose will be metabolized first, as operator site mutation prevents repressor protein binding and thus will lead to the constitutive synthesis of lac operon in test B.   The same thing will happen, as in this case also, constitutive synthesis of lac operon will happen in test C.

Cultures grown in the presence of both glucose and lactose are metabolizing lactose. In the test (b) and (c) will be responsible due to constitutive synthesis of lac operon will happen.

6 0
3 years ago
A diagram of a parent hydra and its
IrinaVladis [17]

The <em>Hydra </em>offspring will also have 30 chromosome.

Explanation:

  • Budding is a method of asexual reproduction.
  • Asexual reproduction takes place through mitosis where diploid cells divide to give rise to identical cells with same chromosome number.
  • Hydra reproduces through budding thus, if the parent hydra has 30 chromosome then the offspring will also have 30 chromosome.
6 0
3 years ago
Wick type of cloud is often taken to be a sign of fair weather
marta [7]
The cloud that usually means good weather is Cu<span>mulus</span>
4 0
3 years ago
Read 2 more answers
What is the purpose of the motor neuron?
Papessa [141]

To send information from the brain or spinal cord to muscles and glands - is the purpose of motor neuron

Explanation:

As part of the central nervous system (CNS), the motor neurons connect the brain and spinal cord to all the muscles and glands present all over the body and innervates them.

Their main function is to transmit nerve impulses from the CNS to the muscles, both skeletal and smooth, and directly controls the movements of the muscles of the body.

A motor neuron is a typical nerve cell with multipolar body. It can be upper of lower motor neuron.

Right from snapping of fingers to movements of hamstrings, all muscular movements functions due to impulse carried by the motor neurons.

Degeneration of the motor neurons leads to neurodegenerative diseases like spinal muscular atrophy or amyotrophic lateral sclerosis.

4 0
3 years ago
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