Answer the following question given this paragraph: Archaeological evidence suggests that people have been using tin for at least 5500 years. Tin is used to form many useful alloys (mixtures of two or more metals). Bronze is an alloy of tin and copper, while solder is an alloy of tin and lead. Q: What is an alloy of both tin and copper? Choices: - Cobalt - silver - Aluminium - bronze A:
bronze
(Question)
Answer the following question given this paragraph: Hair, hair follicle, and oil glands. The oil, called sebum, helps to prevent water loss from the skin. The sebaceous gland secretes sebum, which waterproofs the skin and hair. Q: What does the sebaceous gland secrete which waterproofs the skin and hair? Choices: - pus - progesterone - collagen - sebum A:
(Answer)
sebum
Ques: Answer the following question given this paragraph: lecture. One observation to explain this occurrence might be, "When I eat breakfast before class, I am better able to pay attention. " The student could then design an experiment with a control to test this hypothesis. In hypothesis-based science, specific results are predicted from a general premise. This type of reasoning is called deductive reasoning: deduction proceeds from the general to the particular. But the reverse of the process is also possible: sometimes, scientists reach a general conclusion from a number of specific observations. This type of reasoning is called inductive reasoning, and it proceeds from the particular to the general. Inductive and deductive reasoning are often used in tandem to advance scientific knowledge (Figure 1.7). Q: In hypothesis-based science, specific results are predicted from a general premise, which is called what type of reasoning that proceeds from general to particular? Choices: - reactive - transitive - reflexive - deductive A:
Ans: deductive
(Q).
Answer the following question given this paragraph: How can a molecule containing just 4 different nucleotides specify the sequence of the 20 amino acids that occur in proteins? If each nucleotide coded for 1 amino acid, then obviously the nucleic acids could code for only 4 amino acids. What if amino acids were coded for by groups of 2 nucleotides? There are 42, or 16, different combinations of 2 nucleotides (AA, AU, AC, AG, UU, and so on). Such a code is more extensive but still not adequate to code for 20 amino acids. However, if the nucleotides are arranged in groups of 3, the number of different possible combinations is 43, or 64. Here we have a code that is extensive enough to direct the synthesis of the primary structure of a protein molecule. The genetic code can therefore be described as the identification of each group of three nucleotides and its particular amino acid. The sequence of these triplet groups in the mRNA dictates the sequence of the amino acids in the protein. Each individual three-nucleotide coding unit, as we have seen, is called a codon. Protein synthesis is accomplished by orderly interactions between mRNA and the other ribonucleic acids (transfer RNA [tRNA] and ribosomal RNA [rRNA]), the ribosome, and more than 100 enzymes. The mRNA formed in the nucleus during transcription is transported across the nuclear membrane into the cytoplasm to the ribosomescarrying with it the genetic instructions. The process in which the information encoded in the mRNA is used to direct the sequencing of amino acids and thus ultimately to synthesize a protein is referred to as translation. Before an amino acid can be incorporated into a polypeptide chain, it must be attached to its unique tRNA. This crucial process requires an enzyme known as aminoacyl-tRNA synthetase (Figure 19.12 "Binding of an Amino Acid to Its tRNA"). There is a specific aminoacyl-tRNA synthetase for each amino acid. This high degree of specificity is vital to the incorporation of the correct amino acid into a protein. After the amino acid molecule has been bound to its tRNA... Q: After the amino acid molecule has been bound to its what, protein synthesis can take place? Choices: - base - RNA receptor - dna molecule - trna carrier A:
(A).
trna carrier
Ques:Answer the following question given this paragraph: When heat flows into an object, its thermal energy increases and so does its temperature. Q: When heat flows into an object, its thermal energy increases and so does its what? Choices: - matter - speed - color - temperature A:

Ans:temperature
Ques:Answer the following question given this paragraph: All of the land drained by a river system is called its basin, or watershed. One river system's basin is separated from another river system's basin by a divide. The divide is created by the highest points between the two river basins. Precipitation that falls within a river basin always flows toward that river. Precipitation that falls on the other side of the divide flows toward a different river. Q: All of the land drained by a river system is called its basin, or what "wet" term? Choices: - river bank - groundwater - wetlands - watershed A:

Ans:
watershed