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