Answer the following question given this paragraph: There is a lot of water ice in the polar ice caps and under the surface of Mars. Q: What is found in abundance in the polar ice caps and under the surface of mars? Choices: - carbon - bacteria - fossils - water A:
water
(Question)
Answer the following question given this paragraph: Most hormones are controlled by negative feedback in which the hormone feeds back to decrease its own production. This type of feedback brings things back to normal whenever they start to become too extreme. Positive feedback is much less common because it causes conditions to become increasingly extreme. Q: Most hormones are controlled by what type of feedback, which causes the hormone to decrease its own production? Choices: - positive - neutral - unusual - negative A:
(Answer)
negative
Ques: Answer the following question given this paragraph: The Nuclear Envelope The nuclear envelope is a double-membrane structure that constitutes the outermost portion of the nucleus ( Figure 4.11). Both the inner and outer membranes of the nuclear envelope are phospholipid bilayers. The nuclear envelope is punctuated with pores that control the passage of ions, molecules, and RNA between the nucleoplasm and cytoplasm. The nucleoplasm is the semi-solid fluid inside the nucleus, where we find the chromatin and the nucleolus. Chromatin and Chromosomes To understand chromatin, it is helpful to first consider chromosomes. Chromosomes are structures within the nucleus that are made up of DNA, the hereditary material. You may remember that in prokaryotes, DNA is organized into a single circular chromosome. In eukaryotes, chromosomes are linear structures. Every eukaryotic species has a specific number of chromosomes in the nuclei of its body's cells. For example, in humans, the chromosome number is 46, while in fruit flies, it is eight. Chromosomes are only visible and distinguishable from one another when the cell is getting ready to divide. When the cell is in the growth and maintenance phases of its life cycle, proteins are attached to chromosomes, and they resemble an unwound, jumbled bunch of threads. These unwound protein-chromosome complexes are called chromatin ( Figure 4.12); chromatin describes the material that makes up the chromosomes both when condensed and decondensed. Q: What is the double-membrane structure that constitutes the outermost portion of the nucleus? Choices: - energy fold - nuclear fold - energy envelope - nuclear envelope A:
Ans: nuclear envelope
(Q).
Answer the following question given this paragraph: As we studied in our chapter on the periodic table, we saw that elements share a number of important properties with other elements found in the same group. The chemical behavior of a given element is largely dictated by the configuration of its valence electrons. Many elements have a tendency to gain or lose electrons in order to achieve a more stable configuration. When a neutral atom gains or loses electrons, it becomes an ion. In this lesson, we will look at ways to predict what type of ion a given element is likely to form. Q: What happens when a neutral atom gains or loses electrons? Choices: - it loses protons - it gains protons - it loses neutrons - it becomes an ion A:
(A).
it becomes an ion
Ques:Answer the following question given this paragraph: Arachnids include spiders, daddy-long-legs, scorpions, and ticks. Q: Sharing a phylum with insects, spiders, daddy-long-legs, scorpions, and ticks belong to what class? Choices: - annelids - reptiles - mammals - arachnids A:

Ans:arachnids
Ques: Answer the following question given this paragraph: Blastocyst. The blastocyst consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast. The blastocyst fluid-filled cavity is also known as the blastocoel or blastocoele. Q: What structure consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast? Choices: - nucleus - cytoplasm - cell wall - blastocyst A:
Ans:
blastocyst