Information concerning a chemical product's health hazards, toxicity, and disposal procedures is:
a. found in the manufacturer's material safety data sheets (MSDS).
b. found on the product label.
c. proprietary information and only released at the manufacturer's discretion.
d. obtained through the manufacturer's tech-nical support division; acquiring access to that information is the responsibility of the laboratory worker.
A
The MSDS are supplied by manufacturers to notify laboratory personnel of the potential dangers of the product in question and should be kept on hand and available at all times.
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Genes that help to control body weight encode the proteins
A) fibrin, fibrinogen, and hemoglobin. B) collagen, elastin, and dystrophin. C) estrogen, testosterone, and progesterone. D) leptin, ghrelin, and the melanocortin-4 receptor.
Two intermediates of the sterol biosynthesis pathway, isopentenyl diphosphate and dimethylallyl diphosphate, are used by archaea in the biosynthesis of ________.
A. isoprenoids B. hormones C. diacylglycerol D. nucleotides
The following experiment is hypothetical. Meselson and Stahl labeled DNA with the heavy N15 isotope of nitrogen, then allowed the DNA to go through one round of replication in the presence of the light N14 isotope. After analyzing the resulting double stranded DNA helices in a CsCl density gradient they observed two bands of DNA in the gradient. One band was found in a position expected for DNA that had only the light N14 isotope, while the other band was found at the heavy N15 position. These observations are consistent with which mode of DNA replication?
a. dispersive replication b. conservative replication c. dispersive or semi-conservative replication d. semi-conservative replication
All of the microtubules are the same length, and homologous chromosomes are aligned midway between the spindle poles at ____.
A. telophase I B. metaphase I C. anaphase I D. metaphase II E. anaphase II