Which step of the photosynthesis pathway produces a carbohydrate from CO2 in the atmosphere?
A. the light reactions
B. ATP production
C. the Calvin cycle
D. the C4 pathway
Ans: C. the Calvin cycle
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In humans, spermatogenesis differs from oogenesis in that spermatogenesis ____
a. involves meiosis while oogenesis involves mitosis b. begins at birth while oogenesis begins at puberty c. has unequal cytoplasmic divisions, while oogenesis does not d. produces somatic cells while oogenesis produces gametes e. produces four functional gametes while oogenesis produces one functional gamete
What percentage of the world's tropical forests has been cut down for cropland, fuel wood, grazing land, and timber?
a. 20 percent b. 30 percent c. 40 percent d. 50 percent e. 60 percent
A chi-square analysis of linkage between genes k and f produces a P value of 0.99. What is the likelihood that these two genes are linked?
A) 99% B) 10% C) 9.9% D) 1% E) None of these
What developmental event was key to the evolution of the chordates by forming the notochord and dorsal nerve cord?
A. Gastrulation B. Neurulation C. Morphogenesis D. Neural crest formation E. Organogenesis