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