Answer:
DNA Helicase
Explanation:
The process of DNA replication is very complex and requires a variety of proteins in the form of Enzymes.
The DNA replication starts at the site which is about 245 base pairs long and is rich in AT sequences called Origin of replication. The origin of replication recognised by an enzyme called DNA helicase which breaks the hydrogen bonds present between the bases and unwinds the DNA. The RNA primase enzymes then synthesizes an RNA primer which gets attached and to which DNA polymerase binds and add nucleotides.
Thus, the first enzyme that binds to the DNA is DNA helicase.
Answer:
American Kennel Club = 202 dog breeds
Kennel Club = 211 dog breeds
Federation Cynolgique Internatioinale = 344 breeds
Following gastrulation, the next major development in the embryo is neurulation, which occurs during weeks three and four after fertilization. This is a process in which the embryo develops structures that will eventually become the nervous system
The strategy is to look for unique processes that occur in virus infected cells but not uninfected cells. Look at some of the enzymes encoded by viruses, and the processes they catalyze to find ideas for inhibiting virus replication.Antiviral drug<span>, </span><span>any agent that is used in the </span>treatment<span> of an </span>infectious disease<span> caused by a </span>virus. Viruses are responsible for illnesses such as HIV/AIDS<span>, </span>influenza<span>, </span>herpes simplex<span> type I (cold sores of the mouth) and type II (genital herpes), </span>herpes zoster<span> (shingles), viral </span>hepatitis<span>, </span>encephalitis<span>, infectious </span>mononucleosis<span>, and the </span>common cold<span>.</span>
Answer:
The options
a. New combinations of genes yielding genotypes of greater fitness
b. Few heterozygotes because of underdominance
c. Frequency-dependent selection, leading to fluctuations in fitness
d. Heterozygotes with greater fitness, owing to overdominance
e. A random assortment of genotypes because of genetic drift
The CORRECT ANSWER IS b.
b. Few heterozygotes because of under dominance
Explanation:
In genetics, underdominance (at times called "negative overdominance") is the opposite of overdominance.
It is the selection against the heterozygote, that leads to disruptive selection and divergent genotypes. It occurs in cases of inferior and reduced fitness (As in our case study, it is the different chromosomal fusions and inversions)
of the heterozygotic genotype to the dominant or recessive homozygotic genotype. It is unstable as it causes fixation of either allele.
Another example is the African butterfly species Pseudacraea eurytus, which makes use of Batesian mimicry to avoid predation. This species carries two alleles that gives a coloration that is alike to a different local butterfly species that is harmful to its predator. The butterflies who are heterozygous for this trait are observed to be intermediate in coloration and thus encounter an higher risk of predation and a decrease in the total fitness.
