Mttc Integrated Science (Secondary) Exam Questions And Answers

parsec {Ans: used for measuring large distances = to 3.26 ly}Pyrimidine bases {Ans: six sided sugars with simple ring shape Cytosine Thymine Uracil}mRNA {Ans: messenger RNA located in cytoplasm, used to code for protein synthesis using 3 nucleotide codons}Gene {Ans: portion of DNA that identifies how traits are expressed and passed down, all genes form genotype}Multiple fruits {Ans: produced by many flowers on a single structure, ex: figs, pineapple}Permian extinction {Ans: 90% of all living things became extinct}Passive transport {Ans: do not require energy simple diffusion Facilitated diffusion - specific molecules are transported by carrier proteins osmosis}Phototropism {Ans: Plants bend toward a light source}Karyotype {Ans: picture of genes based on a sample of blood or skin}Endocrine glands {Ans: Secrete hormones directly to blood stream}Epistasis {Ans: two or more genes determine a single phenotype}Xylem {Ans: Vascular tissue that carries water and nutrients upward from the roots to every part of a plant}Stages of embryonic development {Ans: Zygote - diploid cell formed by fusion of two gametes Morula - ball-like mass of 16-32 cells formed by mitotic divisions of the zygote Blastula - hollow ball-like structure, attaches to side