The blastopore is the opening to the blastocoel. Indicate whether the statement is true or false
False - archenteron
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Which of the following mutations would be most likely to have a harmful effect on an organism?
A) a nucleotide-pair substitution B) a deletion of three nucleotides near the middle of a gene C) a single nucleotide deletion in the middle of an intron D) a single nucleotide deletion near the end of the coding sequence E) a single nucleotide insertion downstream of, and close to, the start of the coding sequence
Which of the following statements about bird respiration is false?
A. Air flowing through the air channels in the lungs moves in the opposite direction of blood flowing through the blood capillaries in the lungs. B. Oxygen is exchanged between the air and the bloodstream in the lungs, but not in the air sacs. C. The unidirectional flow of air through a bird's lungs maintains a larger concentration gradient for diffusion than can be obtained through tidal breathing. D. Bird lungs receive fresh air during both inhalation and exhalation. E. It takes two ventilation cycles for a single breath of air to move through a bird's respiratory system.
Which of the following domains contain prokaryotic cells?
a. Archaea and Bacteria b. Eukarya and Archaea c. Bacteria and Eukarya d. Archaea, Bacteria, and Eukarya
Why are conifers and cycads considered gymnosperms?
A. The pollen is wind-dispersed. B. The fruit is not fleshy. C. Pollination and fertilization occur at different times. D. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination. E. They have true vascular tissue but do not form seeds.