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drek231 [11]
3 years ago
5

Does the cell cycle have a beginning and an end

Biology
1 answer:
lukranit [14]3 years ago
3 0

Answer:

No, it is a cycle, so it repeats cyclic.

Explanation:

The cell cycle is divided into two main phases: interphase and mitotic phase.

Interphase is phase characterized by the the cell growth and DNA copy (replication). During this phase, the cell prepares for division, formation of two daughter cells (mitotic phase).

Mitotic phase is subdivided into four phases:

  • prophase, - nuclear envelope breaks down, condensed chromosomes are released
  • metaphase- chromosomes are lined up, mitotic spindle is formed
  • anaphase - the sister chromatids of each chromosomed move to the opposite ends of the cell
  • telophase-final stage, nuclear envelope reforms

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Is the activation of receptors in the various sense organs?
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Answer;

-Sensation

Sensation is the activation of receptors in the various sense organs

Explanation;

-Sensation is the activation of sensory receptor cells at the level of the stimulus. Perception is the central processing of sensory stimuli into a meaningful pattern. Perception is dependent on sensation, but not all sensations are perceived.

-Receptors are the cells or structures that detect sensations. A receptor cell is changed directly by a stimulus. A transmembrane protein receptor is a protein in the cell membrane that mediates a physiological change in a neuron, most often through the opening of ion channels or changes in the cell signaling processes.

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3 years ago
What is hello in Estonian?
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Answer: Hello in Estonian is Tere.

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Identify the type of neuronal cell that detects bright light and provides high-resolution color vision.
alina1380 [7]

Answer:

The correct option is b. cones.

Explanation:

Cones and rods are specialized cells, called photoreceptor cells, that are found in the retina and are responsible for our vision.

Cones, allow to the human eye to have a visual acuity (ability of the eye to resolve, transmit sharp images and perceive small details in an object) and provide sensitivity to the color, are more concentrated in the central yellow spot known as the macula.

There are three different types of cones in color reception: "L cones" (sensitive to long wavelength, which is red), "M cones" (sensitive to medium wavelength, which is green) and "S cones" (sensitive to short wavelength, which is blue). Since color perception depends on the activation of these three types of nerve cells, it follows that the visible color can be determined based on three numbers called triestimulus values.

The rods are necessary for the perception of light and darkness and to adapt to night vision, because they are very sensitive to low intensity light. On the contrary, they become completely blind to bright light and, therefore, lack importance with regard to daytime vision or visual acuity.

8 0
3 years ago
The transfer of genetically determined characteristics from generation to generation is termed The transfer of genetically deter
Nutka1998 [239]

Answer:

The correct answer is inheritance.

Explanation:

Genetic characteristics are transferred from one generation to another.The mechanism of transfer of genetically determined characteristics from generation to generation is called inheritance.

     Genetic characteristics are stored within the sex chromosome of both male(XY) and female(XX).During fertilization when the sperm cells fuses with ovum at that time some characteristics of both male and female gets incorporated into the diploid zygote which give rise to the new organism containing inherited genetic characteristics.

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This organ produces a chemical called saliva that begins to break down food in the mouth.
puteri [66]

Answer: salivary glands

Explanation: i just remember from 4th grade health class

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