In the life cycle of a flowering plant, the ___
a. sporophyte is dominant
b. gametophyte is dominant
c. sporophyte initially is dominant and then
the gametophyte becomes dominant
d. gametophyte is initially dominant and then
the sporophyte becomes dominant
e. gametophyte and sporophyte are
codominant.
A
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Which of the following is microscopy in which the microscope is fitted with light filters that enable the excitation of the specimen with a specific wavelength?
A. Bright-field microscopy B. Dark-field microscopy C. Epifluorescence microscopy D. Electron microscopy
The microbiologist receives a sputum specimen that upon preliminary Gram staining review of direct smear, contains numerous squamous epithelial cells and an excessive amount of contami-nating normal flora. Based on the microbiologists knowledge, the microbiologist rejects the spe-cimen and requests a new sample. The physician insists that the microbiologist culture the sample as received. The
microbiologist should: a. disregard the physicians request and dis-card the specimen. b. notify their supervisor and write-up the physician. c. set-up the culture as ordered noting the lack of specimen integrity that may com-promise culture results. d. the microbiologist should have not called the physician and process the sample as received.
The DNA polymerase proofreading mechanism maintains a low mutation rate in eukaryotic genes
Indicate whether the statement is true or false
Molecular lesions of DNA are called _____.
a) point mutations b) broken side rails c) cross-linking d) rung breaks