Answer:
Natural selection, the keystone of evolution, can switch direction in a matter of months, a novel experiment on lizards reveals.
Answer:
D) Because sticky ends can be temporarily held together by hydrogen bonding between the two strands.
Explanation:
Restriction enzymes cut the DNA at specific restriction sites and by the mechanism of action they can form two types of ends:
- sticky ends-single-stranded overhangs are formed
- blunt ends-without overhangs.
The main advantage of sticky ends (their overhangs) is that they can complementary bind to another overhand formed by the same restriction enzyme. So, for example in cloning, if the DNA of interest and plasmid vector are cut with the same restriction enzyme, that forms sticky ends, fragment of DNA will fit into a bacterial plasmid in one direction.
On the other hand, blunt ends can be inserted into vector in both directions: head-to-tail or tail-to-head.
Hi There! :)
<span>What amino acid is carried by tRNA with anticodon, GUA?
</span>The mRNA sequence that you have shown above has been given in triplets of bases. These triplets are called codons. Therefore the amino acid that tRNA will bring must be complementary to this hence called the anticodon. There is a rule. A always pairs with U (or T if it was a DNA strand) and C always pairs with G.
<span>For the first two triplets I will do the anticodon sequence then you can finish off : GUA GCC ..... </span>
<span>Each codon or anticodon triplet codes for an amino acid. To find this out published tables are used. All the possible triplets will be on there. You will simply just have to read off the names of the amino acid stated next to it in that grid table. </span>
Answer:
The correct option is c ( <span>sexual reproduction joins two cells that each have half the total chromosome number).
Reason:
Meiosis occurs only in reproductive cell in which the number of chromosome reduce to half. This phenomenon is very imoportant and essential for maintaining the number of chromosomes in species.</span><span />
