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4 years ago

When looking at groups of cells, which is ordered from smallest to largest?

1 answer:

4 0

The smallest item in the list would be organelles. Organelles are tiny structures within a cell, that help it to function. Example of organelles are-- nucleus, mitochondria, cell membrane to name a few. Cells are the basic unit of structure and function of all living things, therefore, cells would have to be placed second. They are microscopic. A group of similar cells that work together to perform a specific function, is known as a tissue. Therefore, tissue is next largest. Examples of tissues include, muscle tissue, epithelial tissue, adipose tissue. When different types of tissues work together to perform a function in the body, this group of tissues forms an organ. An example of an organ is the heart. Inside the heart are many types of tissue-- cardiac muscle,nerve, blood, connective, etc. The job it performs is to pump blood. When various organs work together to perform a specific function in the body, this makes up a system. An example is the circulatory system. In this system are many organs that work together. Arteries, veins, capillaries and heart are all part of the circulatory system. Its job is to circulate blood containing nutrients and oxygen to cells and to pick up cellular wastes. All the systems of the body comprise the organism. An organism is a living thing. It can be as tiny as a microbe, or a complex as a human. When referring to a multicellular organism, the correct order from smallest to largest is-- organelle, cell, tissue, organ, system, organism

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What happens during anaphase II of meiosis? The nuclear membrane begins to form around haploid sets of chromosomes. Homologous c

Kazeer [188]

Answer:

The option that says: Sister chromatids separate from each other and migrate to opposite ends of the cell.

Explanation:

This question wants to test us on a very interesting part in genetics that is Cell Cycle, Mitosis and Meiosis.

In mitosis, the cell divide to produce or generate two daughter cells that has the identical genetic infomation just as the one in the parent cell. After mitosis, we have Cytokinesis.

For meiosis, it is divided into two that is meiosis I and meiosis II. Meiosis I is about the separation of homologous chromosomes pairs while meiosis II is about the separation of chromosome into two chromatids.

In anaphase II of meiosis, "Sister chromatids separate from each other and migrate to opposite ends of the cell" after the division of the centromere.

5 0

3 years ago

Identify whether each circumstance provided will promote an increase or decrease in blood pressure

pashok25 [27]

Circumstance that cause an increase in Blood Pressure:

- increasing levels of aldosterone ((influences the reabsorption of sodium and excretion of potassium in the kidneys. This will indirectly influence the blood pressure since the volume of blood will change)

- vasoconstriction ( blood vessels increase their contraction, which equals to more pressure)

-increased release of renin (Converts angiotensinogen, secreted in the liver, into angiotensin I).
- increased activity of Angiotensin-converting enzyme ( this enzyme converts angiotensin I into angiotensin II increasing vasoconstriction).

Circumstances that cause a Decrease in Blood Pressure:

- decreased sodium reabsorption ( by decreasing sodium, the amount of water will also decrease or , in other words,will be excreted. Less water, will decrease volume of blood and that means less blood pressure)

- vasodilation (The smooth muscle in the blood vessels decrease their contraction, which equals to less pressure)

- declining levels of ADH(ADH is produced in the hypothalamus and stimulates vasoconstriction plus it promotes water reabsorption in the kidneys. To reduce blood pressure, is important to have ADH levels reduced)

6 0

3 years ago

The genetic code is a sequence of DNA nucleotides. In eukaryotic cells, the DNA is located in the nuclei of the cells. The genet

siniylev [52]

Explanation: 

Complete question...

a) the same codons are assigned to the same amino acids in most living things.

b) the same codons are assigned to the same DNA sequences in most living things.

c) None of these are correct.

d) the same amino acids are assigned to the same DNA sequences in most living things.

The genetic code is ubiquitous- it is found everywhere in most living organisms. Thus a) the same codons are assigned to the same amino acids in most living things. 

Sequences of DNA make up genes which can have different forms called alleles. DNA is transcribed into mRNA and later translated into amino acids which are linked together by rRNA to form proteins.

Further Explanation:

The nucleic acids are comprised of smaller units called nucleotides and function as storage for the body’s genetic information. These monomers include ribonucleic acid (RNA) or deoxyribonucleic acid (DNA). They differ from other macromolecules since they don’t provide the body with energy. They exist solely to encode and protein synthesis.

Basic makeup: C, H, O, P... life on Earth is Carbon based nucleotides contain 5-carbon sugars, and nitrogen; the bases may contain single to double bond rings

All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. Codons are three nucleotide bases, with each codon encoding an amino acid or signalling the beginning or end of protein synthesis.

RNA codons determine certain amino acids so the order in which the bases occur within in the codon sequence designates which amino acid is to be made bus with the four RNA nucleotides (Adenine, Cysteine and Uracil) Up to 64 codons (with 3 as stop codons) determine amino acid synthesis. The stop codons ( UAG UGA UAA) terminate amino acid/ protein synthesis while the start codon AUG begins protein synthesis.

Learn more about transcription at brainly.com/question/11339456

Learn more about DNA and RNA brainly.com/question/2416343?source=aid8411316

#LearnWithBrainly

8 0

4 years ago

Describe how a change in dna sequence could result in a changed sequence of amino acids in a protein.

egoroff_w [7]

A change in DNA could result in a changed sequence by the amount of atoms and chemicals in the DNA

8 0

3 years ago

What would happen if diploid organisms reproduced by sexual reproduction without first producing sex cells through meiosis?

Alexxx [7]

If meiosis doesn't take place then the fertilization does not take place !

if one fertilised the egg by any means , then the ploidy of the zygote will increase and there generates a lot of disease !

3 0

3 years ago