nln pax questions and answers 100% correct

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nln pax questions and answers 100% correct 1. Which of the following sentences is true? A. All organisms begin life as a single cell. B. Organisms begin life as multi-cellular. C. Some organisms ... begin life as a single cell and others as multi-cellular. D. None of the above. ✔✔A: All organisms begin life as a single cell. 2. Scientists suggest that ________ has occurred through a process called ________. A. evolution/differentiation B. evolution/natural selection C. natural selection/homeostasis D. homeostasis/reproduction ✔✔B: Scientists suggest that evolution has occurred through a process called natural selection. 3. What are the two types of measurement important in science? A. quantitative and numerical B. qualitative and descriptive C. numerical and scientific D. quantitative and qualitative ✔✔D: The two types of measurement important in science are quantitative (when a numerical result is used) and qualitative (when descriptions or qualities are reported). 4. A normal human sperm must contain: A. an X chromosome. B. a Y chromosome. C. 23 chromosomes. D. B and C. E. A, B, and C. ✔✔C: A normal sperm must contain one of each of the human chromosome pairs. There are 23 chromosome pairs in all. Of these, 22 are autosomal chromosomes, which do not play a role in determining gender. The remaining pair consists of either two X chromosomes in the case of a female or of an X and a Y chromosome in the case of a male. Therefore, a normal sperm cell will contain 22 autosomal chromosomes and either an X or a Y chromosome, but not both. 5. All living organisms on Earth utilize: A. oxygen. B. light. C. sexual reproduction. D. neurotransmitters. E. a triplet genetic code. ✔✔E: All living organisms on Earth utilize the same triplet genetic code in which a three-nucleotide sequence called a codon provides information corresponding to a particular amino acid to be added to a protein. In contrast, many organisms, especially certain types of bacteria, do not use oxygen. These organisms live in oxygen-poor environments and may produce energy through fermentation. Other organisms may live in dark environments, such as in caves or deep underground. [Show More]

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