Biology 30 Final Practice Questions And Answers Rated 100%!!!

One homologous pair of chromosomes in a human spermatogonium undergoes nondisjunction during the first division of meiosis. After meiosis is completed, what number of chromosomes will the four newly produced cells contained? - ANS Two cells will have 22 chromosomes, and three cells will have 24 chromosomes Which expression of chromosome content represents somatic cells in people with trisomy disorders such as Down syndrome? - ANS 2n+1 If a diploid plant and tetraploid plant, each capable of normal meiosis, were crossed, the chromosome number in their offsping would be - ANS 3n A logical interpretation that can be drawn from this information is that vitamin A may play a major role in growth by - ANS increasing the amount of mitosis the most likely explanation for the success following the transplant of healthy cells in mice is that the healthy cells.. - ANS produced enough FAH enzyme to restore the function of the liver the presence of patches of healthy cells in the damaged human livers may indicate that - ANS Liver cells in an individual can undergo genetic change and cell division the sequence of events that produces the enzyme FAH(a protein) in liver cells is... 1.tRNA transports amino acids to the ribosome mation from DNA is used to form mRNA 3.mRNA carries the message to the ribosome ome encouters a terminator codon - ANS 2,3,1,4 starting from a single cell, spermatogenesis in horses produces (horse, equus, coballus - 66 (2n) - ANS four cells, each with 66 chromosomes czar nicholas II was not a hemophiliac. his wife was a carrier for hemophilia. what was the probability that any of their daughters was a carrier for hemophilia? - ANS 0.50 two dogs, each with the genotype BbEe, were crossed. what is the percentage probability that their offspring would have a yellow coat colour? - ANS 25% hypophosphatemia is an X-linked dominant disorder that causes a type of rickets. Which statement about people with this disorder is likely true? ted heterozygous females would transmit the trait to all their sons ted males would produce all affected sons and no affected daughters ted males would produce all affected daughters and no affected sons ted heterozygous females would transmit the trait to all their daughters - ANS C The interaction of a chemical with an odour-receptor protein first causes the movement of - ANS sodium ions into a sensory neuron The area of the brain where odours are interpreted is the - ANS cerebrum The structures that are affected by neurofibromas are the - ANS axons of neurons in white matter The neurons that are affected in type 1 neurofibromatosis are - ANS autonomic neurons and somatic neurons The structures of the ear that could be affected in a person with ataxia are the (ataxia plays a role in balance) - ANS semicircular canals Two expected symptoms of pituitary dwarfism in dogs are - ANS hypothyroidism and decreased metabolic rate Exenatide causes blood glucose levels to (exenatide is used in type 1 diabetes) - ANS decrease by causing an increase in the permeability of cells to glucose A higher-than-normal amount of aldosterone causes - ANS increased sodium reabsorption by the kidneys The development of gametes at puberty is stimulated by the production of - ANS FSH in both females and males When a woman's HRT includes a combination of estrogen and progesterone administered together, the hormones replaced are those normally secreted by the - ANS corpus luteum In a woman, a symptom of an endocrine-inactive tumour in the pituitary gland could be - ANS a stopping of the menstrual cycle A structure whose function is not affected by an endocrine-inactive tumour is the - ANS Fallopian tube In a pregnant woman, one effect of a lower-than-normal amount of hCG could be the inability to - ANS maintain the endometrium In organisms that reproduce sexually, the primary purpose of meiosis is the - ANS reduction of chromosome number One role of tRNA in protein synthesis is to attach to - ANS an amino acid in the cytoplasm The dramatic increase in frequency over time of the dominant allele associated with the ability to digest lactose provides evidence of - ANS evolution in the population, which resulted from the selective advantage provided by the dominant allele The flow of calcium ions into the neuron initiates - ANS an action period the effect of allicin on a neuron is similar to the effect of - ANS an excitatory neurotransmitter