Answer the following question given this paragraph: Secondary Vesicles The brain continues to develop, and the vesicles differentiate further (see Figure 13.3b). The three primary vesicles become five secondary vesicles. The prosencephalon enlarges into two new vesicles called the telencephalon and the diencephalon. The telecephalon will become the cerebrum. The diencephalon gives rise to several adult structures; two that will be important are the thalamus and the hypothalamus. In the embryonic diencephalon, a structure known as the eye cup develops, which will eventually become the retina, the nervous tissue of the eye called the retina. This is a rare example of nervous tissue developing as part of the CNS structures in the embryo, but becoming a peripheral structure in the fully formed nervous system. The mesencephalon does not differentiate into any finer divisions. The midbrain is an established region of the brain at the primary vesicle stage of development and remains that way. The rest of the brain develops around it and constitutes a large percentage of the mass of the brain. Dividing the brain into forebrain, midbrain, and hindbrain is useful in considering its developmental pattern, but the midbrain is a small proportion of the entire brain, relatively speaking. The rhombencephalon develops into the metencephalon and myelencephalon. The metencephalon corresponds to the adult structure known as the pons and also gives rise to the cerebellum. The cerebellum (from the Latin meaning "little brain") accounts for about 10 percent of the mass of the brain and is an important structure in itself. The most significant connection between the cerebellum and the rest of the brain is at the pons, because the pons and cerebellum develop out of the same vesicle. The myelencephalon corresponds to the adult structure known as the medulla oblongata. The structures that come. Q: Where is the most significant connection between the cerebellum and the rest of the brain? Choices: - at the cerebrum - at the medulla oblongata - at the meninges - at the pons A:
at the pons
(Question)
Answer the following question given this paragraph: Covalent bonds are bonds in which atoms share rather than transfer electrons. Compounds with covalent bonds are called covalent compounds. Q: What do you call compounds that have covalent bonds? Choices: - reflectivity compounds - valence compound - ions - covalent compounds A:
(Answer)
covalent compounds
Ques: Answer the following question given this paragraph: Relative dating determines which of two fossils is older or younger than the other, but not their age in years. Relative dating is based on the positions of fossils in rock layers. Lower layers were laid down earlier, so they are assumed to contain older fossils. This is illustrated in Figure below . Q: What process determines which of two fossils is older or younger than the other? Choices: - differential dating - difference dating - curve dating - relative dating A:
Ans: relative dating
(Q).
Answer the following question given this paragraph: The echinoderm nervous system has a nerve ring at the center and five radial nerves extending outward along the arms. There is no centralized nervous control. Echinoderms have separate sexes and release their gametes into the water where fertilization takes place. Echinoderms may also reproduce asexually through regeneration from body parts. Q: What process takes place when echinoderms release their gametes into the water? Choices: - migration - stimulation - isolation - fertilization A:
(A).
fertilization
Ques:Answer the following question given this paragraph: Chapter 9 1 Figure 9.10 Ligase, as this enzyme joins together Okazaki fragments. 2 A 4 B 6 A 8 C 10 D 12 The DNA is wound around proteins called histones. The histones then stack together in a compact form that creates a fiber that is 30-nm thick. The fiber is further coiled for greater compactness. During metaphase of mitosis, the chromosome is at its most compact to facilitate chromosome movement. During interphase, there are denser areas of chromatin, called heterochromatin, that contain DNA that is not expressed, and less dense euchromatin that contains DNA that is expressed. 14 Telomerase has an inbuilt RNA template. Q: The dna is wound around proteins called what? Choices: - leptons - nucleotides - pepsins - histones A:

Ans:histones
Answer the following question given this paragraph: The surface of Mars has volcanoes and canyons. There is a polar ice cap and channels that were once filled with water. Curiosity has found evidence of a flowing stream. Q: What two structures are found on mars? Choices: - geysers and canyons - Mountains and Creeks - Trees and Canyons - volcanoes and canyons A:
volcanoes and canyons