A woman with type A blood just had her first child. The child, like mother, had type A blood. What are all of the possible blood types of the father?
What will be an ideal response?
The father could have A type blood (AA or AO) , B type blood (BO) , AB or O type blood. The child could have the genotype AA or AO. Therefore the father could be any blood type that contributes an A or O allele.
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Cyclins modulate the progression of cells through the cell cycle by
A) directly activating G proteins. B) inducing synthesis of constitutively active forms of growth cell receptors. C) activating protein kinases that are critical regulators of cell division. D) degrading histones. E) increasing the production of DNA polymerases.
Leptin is a hormone released by:
a. adipose tissue. b. the stomach. c. the large intestine. d. chylomicrons. e. the liver
Photosynthesis ceases when leaves wilt, mainly because _____
A) the chlorophyll in wilting leaves is degraded B) flaccid mesophyll cells are incapable of photosynthesis C) stomata close, preventing carbon dioxide from entering the leaf D) photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency E) accumulation of carbon dioxide in the leaf inhibits enzymes
Craig Venter and Claire Fraser are working to create a "minimal organism.". They are starting with Mycoplasma genitalium, a bacterium that has 517 genes. By disabling its genes one at a time, they discovered that 265–350 of them code for essential proteins. The scientists are synthesizing the essential genes and inserting them, one by one, into an engineered cell consisting only of a plasma
membrane and cytoplasm. They want to see how few genes it takes to build a new life form. What properties would such a cell have to exhibit for you to conclude that it was alive? What will be an ideal response?