In comparing the development of the unwebbed foot of the chicken and webbed foot of a duck
A. BMP4 is expressed in the foot of a chicken and gremlin in the foot of a duck.
B. BMP4 and gremlin are expressed in both chickens and ducks, but gremlin is expressed throughout the duck leg and not expressed between the toes of chickens.
C. BMP4 is expressed in the foot of a duck and gremlin in the foot of a chicken.
D. BMP4 is expressed between the toes of a chicken and gremlin between the toes of a duck.
E. BMP4 is not expressed in the chicken but is in the duck.
B. BMP4 and gremlin are expressed in both chickens and ducks, but gremlin is expressed throughout the duck leg and not expressed between the toes of chickens.
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Four of the five answers below pertain to smooth muscle. Select the exception
a. voluntary b. tapered cells with a single nucleus c. found in the walls of blood vessels d. found in the walls of the digestive tract e. not striated
The two image-forming lenses of a compound light microscope are
a. the condenser and objective. b. the condenser and the ocular. c. the objective and ocular. d. none of these choices.
Which of the following was not a challenge for survival of the first land plants?
A) sources of water B) sperm transfer C) desiccation D) animal predation E) absorbing enough light
What would happen if snRNPs did not recognize the branch point within an intron?
A. A 3' poly A tail would not be added to the transcript. B. A 5' cap would not be added to the transcript. C. snRNPs would not base-pair with the 5' end of the intron. D. A lariat would not form.