The term cycle is used to describe the Calvin cycle because
A) the metabolic pathway begins and ends with RuBP.
B) the reactions occur only once in a 24-hour period.
C) glucose is synthesized during the process.
D) the process depends on products from the light reactions.
E) CO2 is fixed.
A
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What is the purpose of DNA ligase in a cloning experiment?
A. The purpose is to proofread the vector for mistakes. B. The purpose is to reestablish the stable sugar-phosphate backbone of the DNA molecule C. The purpose is to allow the vector to enter into the cell. D. The purpose is to function as a selectable marker.
According to biological species concept, a new species arises if the members of the population_______
A. Are reproductively isolated from those in other populations. B. Form a new branch in a phylogenetic tree. C. Are geographically isolated from those in other populations. D. Develop distinct morphological appearances from those in other populations.
The seed coat is formed by the hardening of the
A. prothallus. B. embryo. C. ovule. D. endosperm. E. integument.
In a bird species, the amount of male brood care is positively correlated with offspring survival
A father's contribution is, however, completely unrelated to the amount of brood care his mature sons provide. What is the likely explanation for male brood care? a. intersexual selection via direct benefits b. sexual selection for good genes via an honest signal c. male response to environmental factors d. no sexual selection as there is no fitness consequence to male brood care