To seal the cut fragments of DNA together, an enzyme called ________ is used.
A. trypsin
B. amylase
C. peptidase
D. ligase
Answer: D
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Mature human sperm and ova are similar in that they _____
A) both have the same number of chromosomes B) are approximately the same size C) each have a flagellum that provides motility D) are produced from puberty until death E) are formed before birth
AST was performed using Mueller-Hinton agar with 5% sheep blood, 35°C in 5% CO2 from 24 hours according to standard protocols, what is the most likely identity of the organism being tested?
a. S. aureus b. Streptococcus pneumoniae c. Neisseria gonorrhoeae d. Moraxella catarrhalis
The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false.The conclusion drawn from these results is that the length of the dark period, not the light period, controls flowering.
Answer the following statement true (T) or false (F)
A gel electrophoresis is performed, but when the gel imager is used, no bands appear. The researcher might have forgotten to
A) add electric current. B) add antibody. C) ligate the DNA fragments together. D) include DNA dye. E) include an RNA probe.