Which of the following statements about plant tissue culture is false?
A. A callus is a mass of undifferentiated cells.
B. Callus tissue can only form roots, not shoots.
C. Synthetic hormones can be used to selectively promote root or shoot formation.
D. Individual cells can give rise to whole plants through tissue cultures.
E. Virus-free crop species can be propagated by culturing meristems.
Answer: B
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Which branch of this phylogenetic tree identifies the common ancestor of all modern organisms?
a. A b. B c. C d. D e. E
A SNP that can exist as a C or G is associated with a human disease. The genotypic odds ratio of the homozygote CC relative to the homozygote GG is 2.2, which indicates that
A) both CC and GG individuals are equally likely to get the disease because 2.2 is not a significant value. B) heterozygotes are 2.2 times as likely to get the disease as GG homozygotes. C) CC homozygotes are 2.2 times as likely to get the disease as GG homozygotes. D) CC homozygotes are 2.2 times less likely to get the disease as GG homozygotes.
A study of the genomes of dogs from around the world indicated that:a
the dogs’ closest relative is the gray wolf. b. all dogs appeared to develop from a mixture of wolf and coyote. c. some dogs evolved from the coyote and some from the wolf. d. all dogs appeared to evolve from a mixture of the jackal and the wolf. e. all dogs appeared to evolve from a mixture of the wolf, jackal, and the coyote
____ light triggers stomatal opening
a. Red b. Blue c. Orange d. Green
e. Yellow