The normal result of conception is a single cell that contains _____ pairs of chromosomes. 8 14 23 29

Answers

Answer 1

Answer: We all have 23 pairs of chromosomes.

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Which base is found only in DNA? adenine guanine cytosine thymine

Answers

Answer: The correct answer is thymine.

Explanation:

DNA is a complex chemical compound which carries genetic information of a living being. It is a double helix structure. The full form for this is deodorize nucleic acid.

This compound is made up of 4 nitrogenous bases named as adenine (A), guanine (G), cytosine (C) and Thymine (T).

Adenine forms double hydrogen bonds with Thymine and cytosine forms triple hydrogen bonds with guanine.

$A=T\nG\equiv C$

In RNA, the nitrogenous bases found are adenine (A), guanine (G), cytosine (C) and Uracil (U).

The nitrogenous base Thymine is the only base which is found only in DNA.

Hence, the correct answer is thymine.

Answer:

Thymine.

Explanation:

DNA is present as the genetic material in case of almost all the organisms except some viruses only. RNA is present as the genetic material in case of the few viruses only.

DNA is made of the four nitrogenous bases, pentose deoxyribose sugar and the phosphate group. The adenine, guanine and cytosine are present in both the RNA and DNA. Thymine is present in case of the DNA only and absent in RNA and other molecule.

Thus, the correct answer is option (4).

If one parent is heterozygous white (Ww) and the other is homozygous black (ww), give the phenotype and genotype ratios for this cross.

Answers

So if you cross a heterozygous white and a homozygous black, draw a punnet square. So the box is a 2 by 2 with Ww on the top two and ww on the side to. So in the top left corner, it would be Ww, top right, ww, bottom left, Ww, and bottom right, ww. So the possible phenotypes is half and half Ww and ww. This means that two of the potential phenotypes are Ww and ww, both occurring 50% of the time

2.Describe the process that forensic anthropologists are using to identify the dead.

Answers

Ok so i took biomedical sciences. Totally going to help.

Um some of the processes include examining the a dead person if they have died recently.

Others include looking at bone structure as well as certain factors that determine what types of diseases they have and time of death and such and such.

Again i'm not really sure soooooooo this is all i can really get you.

P.S. i think with some modern technology people are able to extract dna from bones but don't quote me on this. That DNA can be used to identify people. I think.

The scientific method could not be used to study which of the following phenomena? the effect of daily exercise on gerbils the authenticity of UFO sightings whether Vitamin C consumption reduces cold symptoms the effects of second-hand smoke on household pets

Answers

The correct answer is B. The authenticity of UFO sightings

Explanation:

The Scientific Method refers to a procedure widely used in science that implies observation, measurement and a hypothesis that is formulated based on observations and then tested or proved through different methods. Because of this, phenomena that can be studied by using the scientific method are those that can be somehow controlled and tested and that are objective rather than subjective.

In the case of the phenomena "The authenticity of UFO sightings" this cannot be studied using the scientific methodology because this cannot be constantly observed, controlled or tested and also the "authenticity" is subjective rather than objective which makes almost impossible to observe the phenomena consistently, create a hypothesis and then prove it and therefore the Scientific Method cannot be applied to this phenomena.

The scientific method could not be used to authenticate UFO sightings. There is no way to set up a control and variable.

Light from distant galaxies most likely show

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Light from distant galaxies can help us calculate how old the galaxies are. By analyzing how the how the light has changed by the time it reached us, we can find out how old the star system from which it originates is.

According to most scientists, green algae are the ancestors of plants. Which statement best supports that belief?A. Both have cell walls made of cellulose, store food material as starch, and have chlorophyll a and chlorophyll b.
B. Both are multicellular and haploid, are often found in fossil remains, and have cell walls made of cellulose.
C. Both have cell walls made of cellulose, have xanthophyll as their chief photosynthetic pigment, and are multicellular.

Answers

Answer:

The correct answer is statement A.

Explanation:

Green algae belong to the division Chlorophyta and comprise about 9000 to 12000 species. Like higher plants, green algae possess photosynthetic pigments like carotene, chlorophyll a and b, and xanthophyll, in a similar proportion as found in higher plants.

A cell of green algae can be sessile or motile, and exhibits a central vacuole, and possesses a two-layered cell wall formed of cellulose and pectin. The storage of food takes place in the form of starch in the pyrenoids. Thus, due to the similarities in the features between the plants and green algae, it is considered that the embryophytes or the lands plants have emerged from green algae. Hence, statement A supports the belief.

Final answer:

Most scientists believe that green algae are the ancestors of plants due to their similar biochemical features. These include having cell walls made of cellulose, the storage of food material as starch, and the presence of chlorophyll a and chlorophyll b.

Explanation:

According to most scientists, the belief that green algae are the ancestors of plants is best supported by the statement: Both have cell walls made of cellulose, store food material as starch, and have chlorophyll a and chlorophyll b. These characteristics highlight the similar biochemical features that underline the evolutionary relationship between green algae and plants. The presence of cell walls made of cellulose provides structural similarities. Storage of food material as starch indicates similar metabolic processes, and both having chlorophyll a and chlorophyll b reveals their shared capacity for photosynthesis, a defining feature of plants.

Learn more about Green Algae and Plants here:

brainly.com/question/31862269

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