Artificial selection involves the use of robots and test tubes babies

Which statement explains how a DNA mutation causes sickle-cell anemia?(1 point)

labwork [276]

Answer:

DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape

Explanation:

Sickle cell mutation is a mutation that affect the production of red blood cell that is needed for the transport of oxygen in the bloods stream.

sickle cell mutation is a result of change in the amino acid which are building blocks of the protein hemoglobin.

The protein is what gives red cells their color, it has two subunits. The alpha

and beta subunit. There is a change in the arrangements of amino acid sequence and that is the basis for the sickle cell shape, beta subunit has valine an amino acid at position 6 instead of the glutamic acid. This alteration results in sickle cell problems that occur in people.

7 0

2 years ago

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Based on your knowledge of the water cycle, from what bodyof water does the most water evaporate? Why?

RUDIKE [14]

Answer: oceans

Explanation: oceans have a greater surface area. over 70% of the Earth’s surface is covered by water.

5 0

1 year ago

A nursing instructor is explaining the role of vascular smooth muscle cells in relation to increases in the systemic circulation

Anettt [7]

Answer:

Norepinephrine

Explanation:

Nerve cells and circulating hormones are the one responsible for vasoconstriction of the vessel walls, as they do not enter the tunica media of the blood vessel, the nerves do not synapse directly on the smooth muscle cells. Instead, they release the neurotransmitter, norepinephrine, which diffuses into the media and acts on the nearby smooth muscle cells, which result in contraction of the entire muscle cell layer and thus reducing the radius of the vessel lumen.

3 0

2 years ago

_____ is the oldest possible age that members of a species can attain, whereas _____ is the number of years the average newborn

tankabanditka [31]

Maximum life span is the oldest possible age that members of a species can attain, whereas average life expectancy is the number of years the average newborn in a particular population group is likely to live.

Every living organisms pass through birth, growth, reproduction, old age, death. this period is called as life span.

<h3>What is death? </h3>

When all life activities are stopped in an individual organisms due to various reasons like ageing, disease, accidents, etc. it is called death.

Also some fully grown living organisms divides physically into two daughters, thus ending its independent existence.

<h3>What is living? </h3>

The objects with specific form and structure exhibits growth, development, reproduction, responsiveness and other unique characteristics of life. it is called living beings.

The living world is wonderful with wide range of living organisms. the earth is populated by various types of plants and animals.

Life is a complex organization of chemical molecules that express itself by chemical reactions leading to specific characteristics like cellular structure, growth, development, reproduction, adaptation, consciousness, death, etc.

Learn more about living here :

brainly.com/question/5836819

#SPJ4

3 0

2 years ago

DNA is a nucleic acid involved in heredity, or the passing down of genetic traits from one generation to the next. DNA consists

Phoenix [80]

Nitrogenous base DNA consists of four unique nucleotides that each contain one unique nitrogenous base—adenine (A), thymine (T), cytosine (C), or guanine (G).

The specific arrangement of these four bases within the DNA of each organism gives that organism its unique traits; here are the arrangements:

-<u>Adenine</u> is paired with <u>Thymine</u> (think of A for apple and T for tree)

-<u>Cytosine</u> is paired with <u>Guanine</u> (think of C for car and G for garage)

search "DNA base pairs" and go to images for better understanding

5 0

2 years ago