DAT Natural Sciences Practice exam terms with 100% Verified Solutions 2023

DAT Natural Sciences Practice exam terms with 100% Verified Solutions 2023 what does the endodermis do? - CORRECT ANSWER regulates passage of substances from the soil into the vascular cylinder What is allelopathy? - CORRECT ANSWER the chemical inhibition of one plant (or other organism) by another, due to the release into the environment of substances acting as germination or growth inhibitors. What is intraspecific competition? - CORRECT ANSWER competition between members of the same species What is a deuterostome? - CORRECT ANSWER blastopore becomes anus What is a protostome? - CORRECT ANSWER Type of coelomate whose mouth develops before the anus What are peripheral proteins? how could you take them off? what does centrifugation do? - CORRECT ANSWER They are bound to the surface of the membrane;;;;; by changing the salt concentration;;;;;;; disrupts cell membrane and releases its contents and fragments What do detergents do? what is the difference between microtubles and microfilaments? - CORRECT ANSWER solubilize membranes and disrupt proteins;;;;; microtubules are at centrioles, and microfilaments are in muscles and composed of actin Glycolysis is exergonic because it releases energy overall;;; what are fungi cell walls made up of that make them unique? Oligodendrocytes = CNS Schwann cells = PNS - CORRECT ANSWER glucans and chitin Fish in freshwater environments:? In contrast, fish in saltwater environments (i.e. marine fish): NAME characteristics - CORRECT ANSWER Are hyperosmotic relative to their environment Drink very little water Salt enters the gills via active transport Produce large volume of urine Are hypoosmotic relative to their environment Constantly drink Salt leaves the gills via active transport Produce low volume of urine what is the function of the allantois? - CORRECT ANSWER Storage of waste until the placenta takes over, early blood formation and development of the urinary bladder. What is aneuploidy? - CORRECT ANSWER Abnormal number of chromosomes. What is brackish water? Which biome is characterized as the largest biome on Earth with long harsh, snowy winters, short rainy and humid summers and with a landscape dominated by conifers? - CORRECT ANSWER salt water;;;; Taiga what is a deciduous forest biome? what is a chaparral biome? - CORRECT ANSWER cold winters with warm summers and moderate levels of precipitation and soil is rich;;;;; highly seasonal precipitation with rainy winters and dry summers. Embryonic mesoderm in humans develops into what? - CORRECT ANSWER muscle and connective tissue which includes blood and bone, as well as circulatory and reproductive systems what does the embryonic ectoderm become? - CORRECT ANSWER epidermis and nervous system including the brain what will the embryonic endoderm become? - CORRECT ANSWER epithelial lining of respiratory tract and digestive tract which includes glands accessory organs like liver and pancreas What is the concentration of Bi3+ in a saturated solution containing 0.01 M of S2-? Assume the Ksp of bismuth sulfide is 10-70. - CORRECT ANSWER Bismuth sulfide dissolves in water as follows: Bi2S3(s) ↔ 2Bi3+(aq) + 3S2-(aq) Ksp = [Bi3+]2 [S2-]3 = 10-70 Therefore, [Bi3 ]2 = 10-70 / [S2-]3 = 10^-70 /( 0.01)^3 = 10^-70 / 10^-6= 10^-64 [Bi3+] =√10^-64 = 10-32 M What is parthenogenesis? - CORRECT ANSWER The spontaneous activation of an unfertilized mature egg followed by normal divisions and subsequent embryonic development