In aquatic ecosystems, the highest nutrients levels are found in areas that have the
A) lowest light levels.
B) highest elevation.
C) fewest sediments.
D) highest temperatures.
E) highest light levels.
A
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If multiple fragments from a genome have been cloned into bacteria, how can a researcher identify the
bacteria that contains the particular sequence they are interested in?
a. The bacteria containing the gene of interest are antibiotic resistant and unable to digest Xgal. b. The DNA purified from individual colonies of bacteria is probed with a short, single stranded DNA fragment that is complementary to the gene of interest. c. The scientists have to sequence all of the DNA from all of the white bacterial colonies; fortunately computers let us automate this process. d. The scientists have to sequence all of the DNA from all of the blue bacterial colonies; fortunately computers let us automate this process. e. We have to isolate the DNA of interest before transforming it into the bacteria. That is the only way to know which bacteria have the DNA of interest.
Which component of the muscle stretch reflex initiates the reflex?
a. motor neuron b. interneuron c. muscle spindle d. acetylcholine e. Schwann cell
If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of
a. 23 chromatids. b. 23 chromosomes c. 92 chromosomes d. 46 chromosomes
Members of which group are not deuterostomes?
A. vertebrates B. echinoderms C. arthropods D. chordates