Ques: Q: After the amino acid molecule has been bound to its what, protein synthesis can take place? Read this paragraph and choose the correct option from the provided answers: 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... Choices: - base - RNA receptor - dna molecule - trna carrier A:
Ans: trna carrier

Ques: Q: What kind of energy comes from the position of a charged particle in an electric field? Read this paragraph and choose the correct option from the provided answers: Electric potential energy comes from the position of a charged particle in an electric field. For example, when two negative charges are close together, they have potential energy because they repel each other and have the potential to push apart. If the charges actually move apart, their potential energy decreases. Electric charges always move spontaneously from a position where they have higher potential energy to a position where they have lower potential energy. This is like water falling over a dam from an area of higher to lower potential energy due to gravity. Choices: - solar energy - mechanical energy - thermal energy - potential energy A:
Ans: potential energy

Ques: Q: Bryophyta is the formal taxonomic name for the phylum that consists solely of what? Read this paragraph and choose the correct option from the provided answers: Choices: - trees - grasses - lichens - mosses A:
Ans: mosses

Ques: Q: Hydrogen gas is generated by the reaction of nitric acid and what else? Read this paragraph and choose the correct option from the provided answers: E XA MP L E 1 7 Hydrogen gas is generated by the reaction of nitric acid and elemental iron. The gas is collected in an inverted 2.00 L container immersed in a pool of water at 22C. At the end of the collection, the partial pressure inside the container is 733 torr. How many moles of H2 gas were generated?. Choices: - gaseous iron - martian iron - carbon - elemental iron A:
Ans:
elemental iron