Answer:
D. functional tRNAs have been spliced by splicesomes.
Explanation:
Functional tRNAs are not spliced by splicesomes, they are trimmed with the help of RNAases instead.
In all tRNAs, RNAase P cuts at 5'end so as to produce a monophosphate because a phosphodiester bond consists of only one phosphate and 2 sugar molecules.
After that 3'end processing occurs in which RNAase II and RNAase D remove extra nucleotide sequences at 3' end. CCA is added at 3' end later on with the help of enzyme named as tRNA nucleotidyltransferase.
So, there is no role of splicesomes only RNAases and other enzymes are involved in tRNA processing.
Answer:
A sexual reproduction occurs when a male, and a female collide together and make a baby. asexual reproduction occurs only when by cell division during mitosis to produce two or more genetically identical offspring.
Fun fact: Sexual reproduction also occurs when haploid gametes appear.
Haploid describes a cell that contains a single set of chromosomes.
Gametes contain half the chromosomes contained in normal diploid cells of the body
Explanation:
Answer:
Fertilization in plants: Fertilization is a process in which male gametes fuses with female gametes forming fertile zygote. The first step of fertilization is pollination in which pollens fall from the anther on the stigma of carpel. From stigma, the pollen grains goes to the ovary and fuses with ovule and fertilization occurs. During this fusion, seed is formed.
Answer:
B. Glucose
Explanation:
Carbohydrates include sugars, starch, cellulose, and glycogen. Carbohydrates are the primary sources of energy for most organisms. The sugar glucose is the main source of energy for cells.
Renewable sources of energy do not contribute to global warming. Use of these resources rather helps in mitigating the global warming. A few example of these are hydroelectric power, wind generated power, solar energy, geothermal energy, tidal energy, biomass energy etc.