ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B: Identify the group number, which often indicates the typical ionic charge. Rationale: Elements in the same group on the periodic table have similar chemical properties, including their tendency to gain or lose electrons to form ions. The group number corresponds to the number of valence electrons an element has, which determines its typical ionic charge. For example, Group 1 elements tend to lose 1 electron to form a +1 ion, Group 2 elements lose 2 electrons to form a +2 ion, and so on. This pattern helps predict the charge of an ion formed by an element based on its position on the periodic table. Summary: A: Looking for elements with similar atomic weights does not directly relate to predicting the charge of an ion based on the periodic table. C: Identifying the period number does not provide information about the typical ionic charge of an element. D: Analyzing the element's position within the group is important, but the group

Correct Answer: B

Rationale: Step 1: Active immunity involves the body's immune response, meaning the body produces its own antibodies after exposure to a pathogen. Step 2: Passive immunity provides immediate protection through antibodies from an external source, such as maternal antibodies or antibody injections. Step 3: The key difference lies in the origin of the antibodies - body's own immune response (active) vs. external antibodies (passive). Step 4: Choice B correctly identifies this distinction, making it the correct answer. Summary: Choices A, C, and D are incorrect as they do not accurately differentiate between active and passive immunity and provide misleading information about the duration, protection spectrum, and vaccination requirements.

Correct Answer: C

Rationale: The correct answer is C: Carries specific amino acids to the ribosomes. tRNA is responsible for carrying specific amino acids to the ribosomes during protein synthesis. It recognizes the codons on mRNA and pairs them with the corresponding amino acids. This process ensures that the correct amino acids are added to the growing polypeptide chain. Choice A is incorrect because tRNA does not transcribe DNA into mRNA; that is the role of RNA polymerase. Choice B is incorrect because decoding the genetic code on mRNA is done by tRNA along with the ribosomes. Choice D is incorrect because tRNA does not modify the structure of proteins; that is typically done by enzymes or post-translational modifications.

Correct Answer: B

Rationale: The correct answer is B: Nucleotide. Nucleotides are the building blocks of DNA, consisting of a sugar molecule, a phosphate group, and a nitrogenous base. They are linked together in a specific sequence to form the DNA molecule's double helix structure. Amino acids (choice A) are the building blocks of proteins, not DNA. Phosphate groups (choice C) are components of nucleotides but are not the sole building blocks of DNA. Fatty acids (choice D) are not involved in the structure of DNA at all. Therefore, the correct answer is nucleotide as it accurately represents the basic components that make up DNA.

Correct Answer: D

Rationale: The correct answer is D: Aorta. The aorta is responsible for pumping oxygenated blood to the body. This happens after the oxygenated blood leaves the left ventricle of the heart through the aortic valve. The aorta is the largest artery in the body and carries blood to all parts of the body, supplying oxygen and nutrients. The other choices are incorrect because: A: Right ventricle pumps deoxygenated blood to the lungs. B: Left ventricle pumps oxygenated blood to the body. C: Pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation.