A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation?
A. The culture medium must be differential.
B. The microbiologist used too much inoculum.
C. The culture is contaminated.
D. The culture medium must be selective.
E. The incubation temperature was incorrect.
Answer: 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
An animal loses water by four of the following processes. Which one is the exception?
a. bleeding b. excretion c. secretion d. exhalation e. inhalation
The ____________________ is the noncellular structure between an epithelium and the underlying connective tissue. Fill in the blank(s) with the appropriate word(s)
How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4?
A) 1 B) 2 C) 3 D) 4