Which of the following characteristics of a fossil suggests that the species does not belong to the hominin group?
A) bipedal walking B) protruding brow ridges
C) small canine teeth D) a flat face
Answer: B
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Chordin is an organizer protein found only in the dorsal regions of frog embryos. Removing chordin would most likely disrupt the determination of which structure?
A) central nervous system B) digestive system C) kidneys D) lungs
If Leydig cells were unable to respond to GnRH, what effect would this have on spermatogenesis?
A. Spermatogenesis would be unaffected. B. Spermatogenesis would increase. C. Spermatogenesis would decrease. D. Spermatogenesis would stop. E. The overall process of spermatogenesis would take longer.
_____ refers to activities by which cells acquire and
use energy. a. Condensation b. Hydrolysis c. Synthesis d. Metabolism e. Dehydration
You encounter an insect with small eyes, long sensory antennae, and a long mouthpart shaped like a sword. What can you conclude about the environment in which it lives?
A) The environment is dark and has many plants. B) The environment is wet and has many other insects. C) The environment is hot and has many primates. D) The environment is cool and has many reptiles.