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The largest of the molecules found in living

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The largest of the molecules found in living organisms; they are composed of chains of nucleotides Nucleotide The basic building block of nucleic acids; a nucleotide is composed of a five-carbon sugar (either ribose or deoxyribose), a phosphate, and a base Nucleus A structure found in the cell that contains the chromosomes Oogenesis The production of ova Ovulation The point during the female reproductive cycle, usually the midpoint, when the ovum has matured and breaks through the wall of the ovary Pangenesis An early and inaccurate idea that acquired characteristics of the parents are transmitted to their offspring
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Peptide bond A link between amino acids in a protein Phenotype The observable and measurable characteristics of an organism Phenylthiocarbamide (PTC) An artificially created substance whose main use is in detecting the ability to taste it; ability to taste PTC is inherited as a dominant Phosphate unit A unit of the nucleic acid molecule consisting of a phosphate and four oxygen atoms Plasma membrane A structure that binds the cell but allows for the entry and exit of certain substances Polar bodies A cell that develops in oogenesis that contains little cytoplasm and does not develop into a mature ovum Polypeptides Chain of amino acids Proteins Long chains of amino acids joined together by peptide bonds Purines Base found in nucleic acids that consists of two connected rings of carbon and nitrogen; in DNA and RNA, adenine and guanine Pyrimidines Base found in nucleic acids that consists of a single ring of carbon and nitrogen; in DNA, thymine and cytosine; in RNA, uracil and cytosine Recessive An allele that is expressed only in the homozygous recessive condition Recombination New combinations of alleles on the same chromosome as a result of crossing-over Ribonucleic acid (RNA) A type of nucleic acid based on the sugar ribose; exists in cells as messenger RNA and transfer RNA Ribose A five-carbon sugar found in RNA Ribosomes Small spherical body within the cytoplasm of the cell in which protein synthesis takes place Segregation In the formation of sex cells, the process in which paired hereditary factors separate, forming sex cells that contain either one or the other factor Sex chromosomes The X and Y chromosomes. Males usually have one X and one Y chromosome; females usually have two X chromosomes Spermatogenesis Sperm production Thymine One of the bases found in DNA; a pyrimidine Trait One aspect of the phenotype Transfer RNA (tRNA) Within the ribosome, a form of RNA that transports amino acids into the positions coded in the mRNA
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True-breeding Showing the same traits without exception over many generations Uracil One of the bases found in RNA; a pyrimidine X chromosome The larger of the two sex chromosomes.
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