If a student was not being careful to pipette up and down several times between dilutions, (added the 1 mL of milk to the 1:10 sample, then withdrew 1 mL from the 1:10 sample and added it to the 1:100 dilution, then withdrew 1 mL from the 1:100 sample and added it to the 1:1000 dilution), what effect would that have on the dilutions being prepared?
A) The number of organisms per dilution would be artificially high
B) The number of organisms per dilution would be artificially low
A) The number of organisms per dilution would be artificially high
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Comb shape in chickens is determined by 2 different genes that independently assort (R/r and P/p). A walnut comb is produced with at least one "R" allele and one "P" allele. A rose comb is produced with at least one "R" allele and two "p" alleles. A pea comb is produced by two "r" alleles and at least one "P" allele. A single comb is produced when both genes are homozygous recessive. If a single comb chicken is mated with a pea comb chicken that is homozygous for the "P" allele, what phenotype(s) for comb is/are expected in their offspring?
a) Only pea comb b) Only single comb c) 1/2 pea comb and 1/2 single comb d) 3/4 pea comb and 1/4 single comb
Antibiotics are often added to biochemical media to restrict the growth to only those organisms that are being looked for in the specimens.
Answer the following statement true (T) or false (F)
The pH indicator in the Simmon's Citrate Agar is
A. Bromothymol blue B. Bromothymol green C. Bromocresol blue D. Bromocresol purple E. Bromocresol green
Which structures indicate where crossing over has occurred?
A. chiasmata B. centromeres C. kinetochores D. centrioles E. spindle fibers