Answer:
B
Explanation:
RNAi is a cellular mechanism for post-transcriptional gene silencing. After transcription of a gene into mRNA, small interfering RNA (siRNA) and microRNA (miRNA) can target the mRNA to form dsRNA. This mRNA then becomes a target of ribonucleases such as the Dicer that break it apart. These mRNA, therefore, do not reach the cytoplasm for translation by ribosomes. This mechanism is hence harnessed and manipulated by scientists to study genes by silencing them.
Answer:
Embryo
Explanation:
An embryo refers to the early stage of development of a multi-cellular organism and it occurs just immediately after fertilization. This development often continues through the formation of cell, tissues, organs.
An embryo is formed from the fertilization of a female ova by a male sperm.
Answer:
protect against pathogens
Explanation:
Answer:
C. 0.7
Explanation:
according to Hardy-Weinberg principle
sum of the frequencies for all the alleles at the locus must be 1, so p + q = 1.
+ = 1
q = 1 − p
q = 1 − (0.3)
q = 0.7
The atoms in a water molecule are held together through a covalent bond.