Answer:
Option A, Neither the researchers nor the study participants know who is receiving the drug and who is receiving the placebo.
Explanation:
In a double blind test, both the researcher and research participants are unaware of the exercise in a medical test . During the research active medication is given to some of the research participants making sure that researcher is unaware of that while observing all the participants. However, at the end of the experiment ,both the researcher and research participants get to know who has received the treatment.
Hence, option A is correct
Answer:
a. ribosome
Explanation:
Ribosome -
The ribosome is common in both the cells of eukaryotes and prokaryotes .
Ribosomes acts as a site for protein synthesis .
Ribosomes are present even on the endoplasmic reticulum .
They link the amino acids with the messenger RNA molecules , which is used for the sequencing of the amino acid to obtain proteins .
The amino acids are carried with the help of the tRNA molecules .
hence , the correct answer for the given information is ribosome .
The correct answer is option C, Planetesimal assembly
Accretion is the assembling of particle to form a massive object by virtue of gravitational attraction. Most of the celestial objects are formed by the accretion process. Planetesimals is an important step in the formation process of planet which involves the accumulation of dust and ice particles. Thus Planetary assembly work on the same principal of planetary accretion model and hence it can be stated as another name of planetary accretion model
Planting only red pine trees to replace native hardwood forests cut for lumber.
