Answer:
Receptors
Explanation:
The cell membrane has receptors integrated or embedded into to it known as Membrane receptors or trans-membrane receptors . Membrane receptors are specialized proteins and act in cell signalling by receiving extracellular molecules by binding to them.
In multi-cellular organisms cell signalling allows speciation o groups of cells and when the signal is released the membrane receptors are the ones that will receive it.
B. was created by a reliable source
C. pretends to be scientific, but actually is not
D. was gathered during a scientific experiment
B. penumbral.
C. apogee.
D. eclipse.
2. Which type of electromagnetic radiation cannot be focused?
A. Ultraviolet
B. X-rays
C. Infrared
D. Gamma rays
3. Which of the following statements is true of the corona?
A. It's where sunspots occur.
B. It's the outermost layer of the Sun's atmosphere.
C. It's the visible surface of the sun.
D. It's responsible for the Sun's density.
4. Tides are a result of
A. currents in the ocean.
B. strong winds in the equatorial regions.
C. friction caused by the Earth's rotation.
D. the gravitational attraction of the Sun and Moon.
1.C | 2.D | 3.B | 4.D
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1. The point in the Moon's orbit when it's farthest away from the Earth is called apogee. On the contrary, the perigee is the point in the Moon's orbit when it's the nearest from the Earth. Those points are very important for tides and other natural phenomenon such as eclipse and in general for the observation of the skies.
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2. Gamma rays are a type of electromagnetic radiation cannot be focused. They diffuse from the emission points until there is an object that stops them. This is the reason why when you have to use gamma rays, you are in other rooms, in order to prevent the radiation to go through them.
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3. The corona it's the outermost layer of the Sun's atmosphere. It's also the part where most of the activity of the sun that we can see take places. It's a subject that has fascinating scientists for centuries and only recently we are studying in more details this interesting and weird place, due to the advancement of technology.
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4. Tides are a result of the gravitational attraction of the Sun and Moon. The Earth, the Sun and the Moon have masses and their own gravities. The interactions between these corps causes tides movement on Earth that are fundament to life on the planet, because they are a fundamental part in the cycle of water and air.
Answer:
1.C
2.D
3.B
4.D
Explanation:
1. The orbit on which moon revolve around earth has a perigee point which is the nearest point to earth while apogee is the farthest point to planet earth.
A penumbral is a region in which occluding body obscure a portion of light. It has no relation with the moon's orbit. Also an eclipse is a phase based on position of moon with respect to earth and sun
Hence, option C is correct
2. Gamma rays are extremely powerful and energetic as they are produced as a result of radiation and hence it is very difficult to focus them on normal lenses which are designed to focus only visible light. They interact with the matter of the focusing surface and destroys them selves.
Hence, option D is correct
3. Corona is the outer surface of stars that extends to millions of kilometers into the space. Sun being a star has corona at its outer layer which is visible only during
total solar eclipse. Hence option B is correct
4. When the gravitational force of moon attracts the water on earth, it presume a rising and falling form that is termed as tides.
Hence option D is correct
2. prophase
3. metaphase
4. telophase
Chromosomes attach to spindle fibres by their centromeres during metaphase of mitosis.
Further Explanation:
Interphase is the resting phase or metabolic phase of a cell where it prepares itself for the cell division process. Interphase comprises of sub-phases namely, Gap1 phase, Synthesis phase and Gap2 phase. G1 is the first gap phase where a cell grows larger in size and the cytoplasm volume increases as more organelles are produced. During Synthesis phase, the strands of DNA replicates. G2 is another gap phase in which the cell becomes much larger in size and this phase is followed by mitosis where cell division occurs.
Mitosis or somatic cell division is comprised of four phases which includes prophase, metaphase, anaphase and telophase. A somatic cell divides to give rise to two identical daughter cells where each cell contains exact copy of each chromosomes present in the parent cell. In the prophase, the envelope that covers the nucleus and nucleolus disappears and chromosomes become visible by forming two chromatids attached to centromere.
In the metaphase, chromosomes alignment at the metaphase plate occurs and spindle fibres attach to the centromere. Spindle fibres pull the chromatids away from the metaphase plate towards the opposite poles of the cell during anaphase. In the telophase, nuclear membrane reforms, chromosomes decondense and nuclear membrane reforms around each daughter nuclei. The cytokinesis is the final stage of cell division process where the parent cell is pinched off to result in two daughter cells.
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Answer Details:
Grade: High school
Subject: Biology
Chapter: Cell division
Keywords: Mitosis, prophase, metaphase, anaphase, telophase, interphase, cytokinesis, somatic cell, nucleolus, nucleus, centromere, chromatids, spindle fibres.
2.scientific theories are absolute and cannot be charged
3.scientists have learned all they'll ever know about science
4.facts can be scientifically