Vascular cambium (wood) evolved independently in several different groups of vascular plants
A. true
B. false
A
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Which of the following statements about sister chromatids is TRUE? rev:
A. Sister chromatids are produced during mitosis. B. Sister chromatids are held together by complementary base pairing of DNA at the centromere. C. Sister chromatids are exact copies of each other and are formed just prior to cell division. D. After mitosis, sister chromatids contain the same genes, but they may have different alleles. E. All of these statements about sister chromatids are TRUE.
The ________ of the retina, which is responsible for acute vision, has densely packed cone cells.
A. otolith B. fovea centralis C. tectorial membrane D. blind spot E. ampulla
The number of T cells drops to below 200 cells/microliter in which phase of HIV infection?
A) phase 1 B) phase 2 C) phase 3 D) initial phase E) asymptomatic phase
The insertion of foreign DNA directly into a cell's nucleus using a glass micropipette is called (electrophoresis/electroporation/microinjection).
Fill in the blank(s) with the appropriate word(s).