Which of the following statements about the modified Ti plasmid used to make transgenic plants is NOT accurate?
A. It is derived from a plasmid found in the bacterium Agrobacterium tumefaciens.
B. It causes crown gall formation.
C. It contains a screenable marker gene.
D. It contains a T-DNA region that integrates into the plant cell's genome.
E. It contains unique restriction enzyme recognition sites for inserting a gene of interest.
B. It causes crown gall formation.
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A 9+2 array refers to
a. microtubules. b. Golgi bodies. c. ribosomes. d. cilia. e. both microtubules and cilia.
Which of the following organs of the endocrine system secretes thyroxine and calcitonin?
a. pituitary gland b. pancreas c. hypothalamus d. adrenal glands e. thyroid gland
The cells within a morula are referred to as ____
a. stem cells b. endoderm c. ectoderm d. blastomeres e. mesoderm
AIDS is caused by the retrovirus HIV, which makes DNA complementary to the viral RNA using
a. RNA polymerase b. beta-galactosidase c. RNA synthase d. ATPase e. reverse transcriptase