Beryllium's atomic mass is 9, and its atomic number is 4. How many neutrons are found in a beryllium atom?
A) 9
B) 13
C) 4
D) 5
D
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Imagine that you are searching for the gene associated with nail-patella syndrome, a dominant genetic disorder that causes developmental abnormalities. In a large pedigree you discover an association between nail-patella syndrome and a genetic marker that
occurs in two different alleles, A and B. Fifteen individuals within this pedigree have nail-patella syndrome and are A/B heterozygotes for the marker. Thirty individuals within this pedigree don't suffer from nail-patella syndrome and are homozygous for the A marker allele. One individual within this pedigree has nail-patella syndrome and is also homozygous for the A marker allele. The most likely explanation for this exceptional individual is that _____. A) a new mutation converted the disease-causing allele to the wild-type form B) a new mutation converted the B allele of the marker to the A form C) the exceptional nail-patella individual is haploid D) recombination occurred between the nail-patella gene and marker locus in one of the parents of the exceptional individual
Instinctive behavior is
a. an innate response. b. a fixed action pattern. c. not altered by experience. d. triggered by a specific stimulus e. all of these
Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on
A) hydrogen ion concentration. B) hemoglobin concentration. C) 2,3-diphosphoglycerate (2,3-DPG) concentration. D) lactic acid concentration. E)PO2.
What viral disease has been successfully eradicated?
A. smallpox B. cowpox C. vaccinia D. varicella E. erythrovirus