QUES: Epigenetics is the study of mitotically and/or meiotically heritable changes in gene function that cannot be explained by changes in the underlying DNA sequence but cause the organism's genes to behave (or "express themselves") differently. One example of epigenetic change is the marking of the genes by DNA methylation which determines whether they will be expressed or not. Gene expression can also be controlled by repressor proteins that attach to silencer regions of the DNA and prevent that region of the DNA code from being expressed. Epigenetic marks may be added or removed from the DNA during programmed stages of development of the plant, and are responsible, for example, for the differences between anthers, petals and normal leaves, despite the fact that they all have the same underlying genetic code. Epigenetic changes may be temporary or may remain through successive cell divisions for the remainder of the cell's life. Some epigenetic changes have been shown to be heritable, while others are reset in the germ cells.
What does epigenetics study?

ANS: changes in gene function

QUES: Many mechanical aids to calculation and measurement were constructed for astronomical and navigation use. The planisphere was a star chart invented by Abu Rayhan al-Biruni in the early 11th century. The astrolabe was invented in the Hellenistic world in either the 1st or 2nd centuries BC and is often attributed to Hipparchus. A combination of the planisphere and dioptra, the astrolabe was effectively an analog computer capable of working out several different kinds of problems in spherical astronomy. An astrolabe incorporating a mechanical calendar computer and gear-wheels was invented by Abi Bakr of Isfahan, Persia in 1235. Abu Rayhan al-Biruni invented the first mechanical geared lunisolar calendar astrolabe, an early fixed-wired knowledge processing machine with a gear train and gear-wheels, circa 1000 AD.
The astrolabe was a combination of what two devices in history?

ANS: the planisphere and dioptra

QUES: The philosophies of Buddhism and Zen, and to a lesser extent Confucianism and Shinto, influenced the samurai culture. Zen meditation became an important teaching due to it offering a process to calm one's mind. The Buddhist concept of reincarnation and rebirth led samurai to abandon torture and needless killing, while some samurai even gave up violence altogether and became Buddhist monks after realizing how fruitless their killings were. Some were killed as they came to terms with these realizations in the battlefield. The most defining role that Confucianism played in samurai philosophy was to stress the importance of the lord-retainer relationshipthe loyalty that a samurai was required to show his lord.
What was the contribution of Confucianism to samurai?

ANS: to stress the importance of the lord-retainer relationship

QUES: Promote and Publicize the Party's Agenda. An important aim of the minority leader is to develop an electorally attractive agenda of ideas and proposals that unites his or her own House members and that energizes and appeals to core electoral supporters as well as independents and swing voters. Despite the minority leader's restricted ability to set the House's agenda, there are still opportunities for him to raise minority priorities. For example, the minority leader may employ, or threaten to use, discharge petitions to try and bring minority priorities to the floor. If he or she is able to attract the required 218 signatures on a discharge petition by attracting majority party supporters, he or she can force minority initiatives to the floor over the opposition of the majority leadership. As a GOP minority leader once said, the challenges he confronted are to "keep our people together, and to look for votes on the other side."
How can a minority leader attempt to set some agenda for house?

ANS:
may employ, or threaten to use, discharge petitions to try and bring minority priorities to the floor.