BIOLOGY HIGH SCHOOL

Which statement is one component of the cell theory?

Answers

Answer 1
Answer:

The options attached to the question above are given below:

A. All living and nonliving things consist of one or more cells.

B. Cells and living organisms are spontaneously created.

C. Cells are the most complex unit of structure and function in living things.

D. A cell is the basic unit of structure and function of all organisms

ANSWER

The correct option is D.

The cell theory is one of the major theories in biology and it states the facts about living cells. The theory states that, the cell is the most basic unit of all organisms and all living organisms are made up of one or more cells. The organisms that are made up of only one cell are described as unicellular while those that possess many cells are described as multi cellular. The theory also states that all cells come from pre-existing cells.



Answer 2
Answer:

the correct answer is d

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Explain in your own words how the Cell Theory is an example of a scientific theory.

Cara and Chuck were looking at pond water through a microscope. They saw this image. Cara wondered what it was. Chuck said it had to be a living thing because it wasA) green.
B) moving.
C) made of cells.
D) round throughout.

Answers

The correct answer is (c) made of cells.

Cell is the basic structural and functional unit of life. The study of cell is called cell biology. Cells can easily be observed under a microscope. As pond water contains many microscopic structures such as bacteria, protozoa, algae and  some small insects they can easily be observed under microscope. The organism that is seen can be unicellular or multicellular            

the answer is made of cells

______are short and stout.
a. Endomorphs
b. Ectomorphs
c. Mesomorphs

Answers

Answer: A -endomorphs


Endomorphs usually have a shorter build and they gain fat very easily. Thus endomorphs are short and stout. They have very heavy arms. They have strong muscles in the upper leg.

Answer:

The correct answer is option A, Endomorphs

Explanation:

There are three body types in human beings and the characteristics features of all three body types is as follows:

1. Ectomorph - Skinny appearance, Small chest, joints,  bones and buttocks, Less body fat (without exercising), long limbs and Gains weight (build muscles) with difficulty

2. Mesomosph - Heavy body, Strong build, Gains muscles  and fat easily, have Athletic body of rectangular shape

3. Endomorph –  Soft  and round body, short limbs, Gains muscles  and fat easily

Thus considering the features of all three body types, it is clear that  Endomorphs are short and stout

Order the steps from arrival of transcription-promoting factors at the eukaryotic DNA gene promoter to synthesis of an mRNA copy of the gene. Include the terms RNA polymerase II, elongation, promoter, TATA box, nucleotides, and transcription factor.

Answers

Answer:

Explanation:

There are 3 different types of DNA dependent RNA polymerase. RNAP II is the main enzyme synthesizing mRNAs.

1. Signals for initiation of transcription

Promoters: there are certain specific areas on the DNA that act as starting signals for initiation process.

The DNA polymerase attaches to the promoter site on the template DNA strand.

TATA Box: upstream of the transcription start site is 5'-TATAAA-3' it is referred to as the TATA Box. It acts as a signal for the start region.

2. Initiation of Transcription. The DNA helix unwind, and the RNAP binds to the promoter site on the 5' end DNA with the help of sigma factor. RNAP reaches the appropriate site of the gene and add the first nucleotide of the mRNA.

3. Elongation of Transcription: the RNAP moves along the DNA template, new nucleotides are incorporated in the nascent mRNA, one by one, according to the base pairing rule.

4. Termination of transcription: specific signals are recognized by the termination protein (Rho factor). When it attaches to the DNA, rnap can't move further. So the enzyme dissociate from DNA and consequently newly formed RNA is released.

Which two microscopes generate three-dimensional images? scanning electron microscope and scanning tunneling microscope transmission electron microscope and scanning electron microscope scanning tunneling microscope and transmission electron microscope compound light microscope and scanning electron microscope.

Answers

The correct answer is scanning electron microscope and scanning tunneling microscope.  

The SEM refers to a kind of electron microscope, which generates three-dimensional images of a specimen by scanning the surface with a focused beam of electrons. The electrons associated with the atoms in the specimen, generating different signals, which comprise data regarding the composition of the specimen and the surface topography.  

An STM refers to an apparatus for imaging three-dimensional image surfaces at the atomic level. In this, good resolution is regarded to be 0.01 nm depth resolution and 0.1 nm lateral resolution.  

The STM can be utilized not only in a high-ultra vacuum but also in water, air, and numerous other gas or liquid ambient, and the temperatures spanning from 1000 degree Celsius to zero Kelvin.  
Its scanning electron microscope and scanning tunneling microscope

Dark spots on the photosphere are known asa. the corona.
b. solar wind.
c. sunspots.
d. the chromosphere. user: which type of electromagnetic radiation cannot be focused?
a. gamma rays
b. ultraviolet
c. infrared
d. x-rays

Answers

the darkspots on the photosphere are known as : C. sunspots this phenomenon happened because reduced surface temperature cause a concentration of magnetic fluc. The type of electromagnetic radiation that cannot be focused is : A. gamma rays gamam rays caused the electric fluctuation in the field to be much faster than the electron distribution, making it unable to be focused

Virus? Living or not? If we use the image as an indicator, we might say living because

Answers

A virus is a tiny organism and may lead to mild-severe illnesses in animals or plants or humans.

Biologically we can term virus as a bit of RNA or DNA in a protein coat. It cannot replicate without another organism.

If we use an image of indicator, we may say yes virus is living. This is because the virus particle is non-cellular but has an NDA core.This core is enclosed in a protein coat and it has spike-like projections in all over its surface.

Answer:

b

Explanation:
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