Biology Test 1 Please don't use any search browser to find the answer. Just do it yourself so you can measure your knowledge power.Best of Luck! Please! Enter Password 1 / 50 DNA was first discovered in 1869 by: F. Miescher Watson and crick P.A. Levene Franklind 2 / 50 Which of the followings are formed during gastrulation? Mesoderm Ectoderm All of the above Endoderm 3 / 50 Double helical structure of DNA was proposed by: Watson and Crick Walther Fleming P.A. Levene F. Miescher 4 / 50 Glands in the endocrine system: None of the above Release hormones as rapidly as nerve impulses are transmitted Release hormones into the bloodstream or the fluid around cells Produce hormones that are secreted into the digestive tract 5 / 50 Cell death: Klinefelter’s syndrome Mitosis Necrosis Turner’s syndrome 6 / 50 What is a chromatid? A chromosome in G1 of the cell cycle A replicate chromosome A chromosome found outside the nucleus A special region that holds two centromeres together 7 / 50 Which type of tissue enables a person’s fingers to move as he or she plays the piano? Joints Connective Nerve Muscle 8 / 50 What is the role of progesterone hormone in women? Development of the uterine lining Female secondary sex characteristics Spermatogenesis Follicle development 9 / 50 During emergencies, the “fight-or-flight” response: Decrease the heartrate is the result of aldosterone causing faster blood flow is caused by hormone secretions in the adrenal medulla is stimulated by cortisol 10 / 50 Pseudopodia: A.F Huxley Lock jaw Amoeba Endoskeleton 11 / 50 A neuron with its axon connected to another neuron and its dendrites connected to a receptor: Sensory Motor Association Unipolar 12 / 50 Chemotherapy: Kills the cancer cells a condition in which liver cells lack receptor for removing cholesterol High level of blood cholesterol is also done in cancer patients 13 / 50 The allele that masks the effects of the other and the masked allele are known as: Dominant, incomplete Homozygous, heterozygous Dominant, recessive Homozygous, recessive 14 / 50 The three primary soil macronutrients are: Copper, cadmium and carbon Carbon, oxygen and water Boron, zinc and manganese Potassium, phosphorus and nitrogen 15 / 50 The liver is: Medium-sized internal organ Body s largest internal organ Smallest internal organ All options are incorrect 16 / 50 Analogous structures: Have same functions but different structures Have different structures and functions None of the above Have same structures but different functions 17 / 50 Which one of the following structures is haploid? Primary spermatocytes Sertoli cells Spermatogonia Secondary spermatocytes 18 / 50 What is the mixed gland of the human body? Pituitary Thyroid Liver Pancreas 19 / 50 Ethene Initiates flowering Triggers ripening of fruit Promotes leaf abscission All of the choices are correct 20 / 50 Which of the following pollutants causes ozone holes in the ozone layer? CFC SO2 CO2 CO 21 / 50 The term niche was first proposed by: Hardy Weinberg Joseph Grinnell Charles Eton Ernst Haeckel 22 / 50 What is the risk of a colour blind child in a family when mother is colour -blind but father is normal? 50% 75% 100% 25% 23 / 50 The condition of small skull is: Cleft palate Polydactyl Haemophilia Microcephaly 24 / 50 Human chromosomes have how many nucleotides? 40 million 1000 140 million 10 25 / 50 The best description of when ovulation occurs in the human is: 14 days after the beginning of menstruation 14 days after the end of menstruation Exactly midway between menstrual cycles 14 days before the beginning of menstruation 26 / 50 What is the average weight of the human heart? 300g 500g 250g 200g 27 / 50 All other chromosomes except X and Y chromosomes are called: Pseudosomes Autosomes Sex chromosomes Monosomes 28 / 50 What is the total body weight of human skeleton? 70% 40% 80% 18% 29 / 50 Lactic acid fermentation takes place In Heart Pancreas Liver Muscles 30 / 50 Birds maintain their body temperature within a range of: 36C to 38C 25C to 35C 41C to 43C 30C to 40C 31 / 50 The role of cytoplasm in development is: Receives information from nucleus (Does not take part in development Turns the genes on and off Acts as template to form new structure 32 / 50 Which of the following traits is not sex-linked recessive? Hypophosphatemic ricket Colour blindness Haemophilia tfm syndrome 33 / 50 Vegetative propagation does not involve: Stem parts Flower parts Leaf parts Root parts 34 / 50 During emergencies, the “fight-or-flight” response: is stimulated by cortisol is the result of aldosterone causing faster blood flow is caused by hormone secretions in the adrenal medulla Decrease the heartrate 35 / 50 What proportion of UV radiation from the sun normally absorbed by the atmospheric layer of ozone? about half around a quarter More than 99% Less than 10% 36 / 50 Planaria has: Special cells for regeneration None of the above Undifferentiated cells for regeneration Differentiated cells for regeneration 37 / 50 Prior to maturation and ejaculation, sperms are stored in the: Seminal vesicle Ejaculatory duct Prostate gland Epididymis 38 / 50 Which among the followings is not a major use of CFCs? Buoyancy gas for blimps and balloons Production of plastic foams Pressurizing agent in aerosol cans Cleaning of computer parts 39 / 50 Metabolic water is: (B) Produced by oxidation of fats (B) and (C) (C) Useful to desert mammals (A) Water outside the cells of animals 40 / 50 ------have a limited number of organelles? organ system Eukaryotes None of the above Prokaryotes 41 / 50 The highest part of the nervous system is: The highest part of the nervous system is: Medulla oblongata Dorsal root ganglia of thoracic nerves Cerebral cortex 42 / 50 The hormone involve in birth is: Prolactin Calcitonin Oxytocin Thyroxin 43 / 50 The process by which the sperms are produced is known as: Gestation Ovulation Spermatogenesis Oogenesis 44 / 50 The interstitial cells are found: within the wall of epididymis in the seminiferous tubules of the testes between the seminiferous tubules lining the wall of vas deferens 45 / 50 Turner’s syndrome Diplotene Rapid division Cell cleavage Missing X 46 / 50 Which of the following is a phase of mitosis? S phase Interphase Prophase G0 47 / 50 Excessive production of thyroid hormones by the thyroid gland: can cause a goiter can cause stunted growth and retardation in children can cause nervousness, irregular heartbeat, and weight loss is called hypothyroidism 48 / 50 Which stage of the human life cycle occurs first? Childhood Puberty Adolescence Adulthood 49 / 50 Mango plant is: Xerophyte None of the above Hydrophyte Mesophyte 50 / 50 Fungi animals and plants may consist of up to? Trillions of cells None of the above Millions of cells Billions of cells Your score is 0% Restart quiz
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