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3 years ago

Which thick layer of the heart maintains its constant pulse?

1 answer:

5 0

The myocardium is the thick, middle layer of the heart and is composed of cardiac muscle. Cardiac muscle is very unique because it possesses the characteristics of skeletal muscle AND smooth muscle. Skeletal muscle controls the voluntary movement of the body, while smooth muscle is responsible for the movement of all other body organs. The myocardium acts on its own, with no conscious effort.

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Four floral organs of a complete flower

Alik [6]

Your answer is carpels, stamen, petals, sepals.

5 0

3 years ago

Select all the correct answers.

NISA [10]

Answer:

B) They release oxygen that organism use to breathe.

Explanation:

The process of this is called Photosynthesis. The plant takes in carbon dioxide and sunlight. The sun and water makes it possible for the plant to make sugars which are glucose which is the plant's food. And the byproduct of that is oxygen.

4 0

3 years ago

Read 2 more answers

Insect hormones and their receptors ________. A. act independently of each other B. are a focus in pest control research C. util

Leokris [45]

Insect hormones and their receptors are a focus in pest control and research. Hence, Option B is correct.

Some of the insect hormones such as ecdysone (molting hormone), JH (juvenile hormone) and their analogs can be used for biological control of pests.

Option A: Hormone receptors are proteins that bind hormones and form hormone receptor complex to maintain cellular activities.

So Option A is incorrect.

Option B: Some of the peptide hormones used in pest control and research. So Option B is correct.

Option C: Peptide hormones interact with only cell surface whereas aminoacid derivatives and thyroid hormones directly interact with nucleus. so Option C is incorrect.

option D is incorrect.

Learn more on hormone receptor complex here:

brainly.com/question/15241630?utm_source=android&utm_medium=share&utm_campaign=question

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3 0

1 year ago

Many different types of mutations can occur within the body. An individual experiences a mutation that changes a base

Georgia [21]

Answer:

The type of mutation responsible for changing a base in the mRNA strand, without changing the coding aminoacid or protein, is called a silent mutation.

Explanation:

In a silent mutation occurs the change of a nitrogenous base in one of the codons that encodes an aminoacid, without changing the aminoacid or altering the structure or function of the protein to be synthesized.

In this type of mutations the change of the base does not mean the change of the aminoacid, because some aminoacids can be coded with more than one codon. In the case of Leucine, the codons that encode it are CUU, CUC, CUG or CUA, so even if a base changes, the final protein will be the correct one.

For the other options:

Missense: the change of the base in the DNA chain implies the change of the codon in the mRNA and of the encoded aminoacid, in that way a structural and functional alteration of the synthesized protein occurs.

Nonsense: the change in the nitrogenous base in the DNA leads to the coding of a termination codon, so that the protein is ultimately incomplete.
Insertion: in this case there is the addition of more nitrogenous bases to the DNA chain, with respect to the original one.

3 0

3 years ago

Read 2 more answers

You've discovered a new plant species in which

valina [46]

Answer:

All the crossing will be like this after realizing it:

Explanation:

Gl x Gl

GG, Gl, Gl, ll

gl x gl

gg, Lg, Lg, LL

On the first crossing we'll have 50% Gl and both other genotypes will be 25%

On the second crossing we'll have 50% Lg and both other genotypes will be 25%.

6 0

3 years ago