<span>False. RNA has four different bases, adenine, guanine, cytosine and uracil. The first three of these are also found in DNA, but when it comes to RNA, there is no thymine, it is in fact replaced by uracil as the base to compliment adenine. So RNA has adenine, but not thymine.</span>
The answer is D. multiple alleles
Answer:
C. Most plants use single nitrogen atoms, not N2 molecules.
Explanation:
Answer:
Sam, Tim, Bella, and Joshua
Explanation:
The correct answer would be <em>Sam, Tim, Bella, and Joshua</em>.
<u>The human pedigree is a pictorial representation of a family tree that depicts how a particular trait is inherited across different generations.</u>
In the human pedigree, those phenotypically affected for the trait in question are represented by filled-in shapes, with circles representing females and squares representing males. Half-filled shapes represent heterozygosity or carriers of the trait.
<em>Sam, Tim, Bella, and Joshua were represented by filled-in shapes in the illustrated pedigree. Hence, they are affected for red-green color blindness. </em>
completed question'
.....culturing viruses that requires a human host
Answer:
Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host
Explanation
Viruses can not thrive in a non-living host or artificial media.They are intracelular parasites which needed living host to replicate . Cultures lines from Human embryo in are therefore used for culturing viruses of human host, so that its mode of replication and gene expression can be studied, and therefore its virulence can easily be studied.
This method have the advantage that;
1.there is no need to make use of the whole animal rather,on a tiny tissue needed can be isolated for culture.
2. the cells growth is continuous,and can be preserved in liquid Nitrogen and renew for future culture
3. cells can be grown in different containers, with ability to decide the number of cells needed.
Temperature is kept at optimum for human in the culture at 37 degree centigrade, nutrients are provided, NaHC03 as buffers for C02, and the medium is humidified.
