Short-day plants
a. flower in early spring.
b. will not bloom until they have been
exposed to a dark period longer than a
critical length.
c. flower in the fall.
d. will not bloom if their dark period is
interrupted by a short pulse of intense red
light.
e. do all of these
E
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Tissues derived from mesoderm are absent in
a. sponges. b. cnidarians. c. flatworms. d. sponges and cnidarians. e. sponges, cnidarians, and flatworms.
How is it possible for an enzyme to lower the required energy of activation for a reaction? What will be an ideal response?
Which of the following Brucella species is most likely indicated in this case?
a. Brucella abortus b. Brucella suis c. Brucella melitensis d. Brucella canis
At which point or stage would the majority of cells in the embryo no longer be stem cells?
A) the pre-embryo stage B) after the organs start to develop C) in the blastocyst D) A large number of stem cells would exist in all these stages.