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Questions in biology

[Terjawab] In diploid organisms, having two homologues of each chromosome can be beneficial if one allele of a gene encodes a nonfunctional protein. Can haploid organisms avoid the negative effects of nonfunctional alleles? A. No, because there are two chromosomes each with a single allele that is always the same, and one cannot compensate for the other being nonfunctional. B. Yes, because there are two chromosomes each with a single allele that is always the same, and one can compensate for the other being nonfunctional. C. No, because there is only one allele for the gene in each cell, and the nonfunctional allele has no other allele to mask it. D. Yes, because there are always other alleles for other genes that will compensate for a nonfunctional allele. E. Yes, because there is only one allele for the gene in each cell, and the nonfunctional allele will be masked by another allele of a different kind.

[Terjawab] Jillian is a new mother. The first time she nursed her baby, she instantly bonded. This is MOST likely caused by the release of the hormone: A. oxytocin B. estrogen C. adrenaline D. serotonin

[Terjawab] Which of the following processes occurs in the liver? A. bile production B. HCl production C. production of most digestive enzymes D. bile storage

[Terjawab] In a balanced ecosystem, the number of producers herbivores tertiary consumers is far greater than the number of

[Terjawab] Toxicology is the study of A. viruses. B. transportation. C. poisons. D. cancers.

[Terjawab] How did we get from a few thousand cells to more than a million? a) Large number of offspring per generation b) Very quick rate of meiosis c) Bacteria lay thousands of eggs d) Doubling by binary fission

[Terjawab] Which of the following correctly sequences the segments of the small intestine? A. duodenum; jejunum; ileum B. jejunum; ileum; duodenum C. ileum; colon; jejunum D. ileum; esophagus; colon

[Terjawab] A. 36 cm² B. 84 cm² C. 28 cm² D. 7 cm² 41. All of the following are mammals EXCEPT A. Shark B. Seal C. Porpoise D. Bat 42. Bats and birds are good fliers but the bat differs from bird in having A. Diaphragm B. Four-chambered heart C. Wings D. Warm bloodedness 43. By the statement 'survival of the fittest', Darwin meant that A. The strongest of all species survives B. The most intelligent of the species survives C. The cleverest of the species survives D. The most adaptable of the species to changes survives 44. Most of the endangered species are the victims of A. Habitat destruction B. Over-hunting C. Acid rain D. Competition with introduced species 45. During heart attack, a doctor may inject A. Thyroid B. Prolactin C. Insulin D. Adrenaline 46. The autonomic nervous system controls all of the following EXCEPT A. Secretion of digestive juice B. Sweating C. Thought D. Peristalsis 47. Which one of the following human cells do not contain mitochondria? A. Nerve cell B. Red blood cell C. Liver cell D. White blood cell 48. Which of the following is NOT correctly matched? A. Sycon - Canal system B. Star fish - Radial symmetry C. Round worm - Pseudosegmentation D. Insect - Metameric segmentation

[Terjawab] The function of glycogen is to A. lower blood glucose levels when they rise after a meal. B. store glucose in humans and animals. C. create membrane structures in plants. D. store energy in plants.

[Terjawab] Marfan syndrome is a genetic trait caused by a dominant allele. A teenager whose mother has the syndrome (but whose maternal grandfather was not affected), and whose father was unaffected, is concerned that she may have the trait. Write out a Punnett square showing this cross using the letter A/a for the gene that determines Marfan syndrome.