A large deletion removes the promoter and first three exons of a gene. No mRNA or protein is detected. What type of allele is this mutant allele?
A) hypomorphic allele
B) hypermorphic allele
C) null allele
D) antimorphic allele
C) null allele
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All of the following are mechanisms of thermoregulation in ectothermic animals EXCEPT
A. countercurrent heat exchangers. B. changing the rate of heat production by muscular activity. C. changing the rate of heat loss by vasodilation and vasoconstriction. D. relocating to cool areas when too hot or warm areas when too cold. E. insulation in the form of feathers or fur.
Which of the following is true of bulimia
nervosa?
a. it is most common among young women b. those with this disorder have pitted and brittle teeth c. those with this disorder are more susceptible to esophageal cancer d. those with this disorder are more susceptible to heart arrhythmia and convulsions e. all of these are true of bulimia nervosa
Benedict's reagent is a chemical that is used as a test for the presence of a free aldehyde functional group on glucose. The aldehyde is used when glucose and fructose bind together to form sucrose, and the Benedict's test is negative. Starch contains a great deal of glucose but gives a negative Benedict's test because:
A. all of the aldehyde groups on the starch are oxidized and cannot react with the Benedict's reagent. B. starch is not soluble in water and cannot react with Benedict's reagent. C. only the glucose at the end of a chain of starch will have an exposed aldehyde functional group to react with Benedict's reagent. D. glucose in starch has lost a carbon atom and cannot react with Benedict's reagent.
What is required for the separation of homologous chromosomes at anaphase I?
a) the separation of sister centromeres b) the dissolution of the chiasmata c) the separation of the nucleosomes d) the dissolution of the centromeres e) the dissolution of the centrosomes