The crab industry needs female crabs for growing more crabs. What bacterium might be used to ensure development of female crabs and shrimp?
A) Acinetobacter
B) Gemmata
C) Neisseria
D) Pelagibacter
E) Wolbachia
E
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A man who has normal hearing and has a recessive deafness allele on chromosome 17 marries a woman who also has normal hearing and also has a recessive deafness allele, but this allele is on chromosome 3. The probability that their children will be deaf due to either of these mutated genes is closest to
A) 100%. B) 50%. C) 25%. D) 0%.
In the famous Spemann-Mangold experiment, what detail was crucial to understanding the result?
A. transplanting the new dorsal lip cells to the same dorsal lip location in the second embryo B. using genetically different donor and host frogs C. placing the dorsal lip cells deep inside the archenteron D. treating the dorsal lip cells with morphogens before transplanting them
The structure labeled "A" is the ____
a. aorta b. inferior vena cava c. pulmonary artery d. pulmonary vein e. superior vena cava
The greatest volume of blood is found in the
a. aorta and arteries. b. capillaries. c. veins. d. lungs. e. heart