Which of the following conditions is necessary for the sample estimates of the population coefficients that best describe the co-movement amongst the variables to be consistent?
A. The sample is a random sample.
B. The errors are heteroscedastic.
C. The errors are distributed normally.
D. The errors are homoscedastic.
Answer: A
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As the two strands of DNA are unraveled, which enzyme relieves the strain on the two strands?
A. DNA polymerase B. DNA ligase C. DNA gyrase D. DNA endonuclease E. DNA exonuclease
pH is
(a) a measure of phosphorous concentration. (b) a measure of hydrogen ion concentration. (c) measured by counting the number of different kinds of aquatic insects. (d) measured on a scale from 1 to 100.
Researchers found an increase of abnormal meiosis in mouse oocytes when the mouse facility started washing the animals’ plastic cages and water bottles in a new, alkaline detergent. The detergent had damaged the plastic, which began to leach bisphenol A (BPA). Looking at the data in this experiment, which hypothesis do the data best support?
1.glass bottles were affected by the alkaline detergent
2.damaged cages had the greatest abnormal meiosis
3.damaged bottles had the greatest abnormal meiosis (26.9%)
4.the effect of damaged cages and damaged bottles was cumulative
How is a bacterial chromosome replicated?
a. The linear DNA molecule is replicated from multiple origins of replication bidirectionally. b. The linear DNA molecule is replicated from one origin of replication bidirectionally. c. The circular DNA molecule is replicated from multiple origins of replication bidirectionally. d. The circular DNA molecule is replicated from one origin of replication bidirectionally. e. The circular DNA molecule is replicated from one origin of replication unidirectionally.