Two species of pines, Pinus radiata and Pinus muricota, live together in California and are capable of forming hybrids under laboratory conditions. However, they do not interbreed because one releases pollen in February and the other in April. What is the genetic isolating mechanism involved?
A) geographic
B) temporal
C) gametic
D) ecological
Answer: B
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Which of the following is the most responsible for success of humans as a population?
A. the ability to speak B. being bipedal C. the ability to transmit culture D. driving biological evolution through cultural evolution E. None of the answer options is correct.
The cribriform foramina, through which the fibers of cranial nerve I pass, are located in the ________ bone on the floor of the skull.
Fill in the blank(s) with the appropriate word(s).
Butterflies are diploid organisms. In these animals, the sex of an individual is determined by Z and W chromosomes. Use
this information to answer the following question. Which chromosomes are carried by a normal male butterfly?
a. ZO b. ZW c. WW d. WO e. ZWW
Look at the diagram of a cross-section of a cell membrane below. The cell membrane controls movement of materials into and out of the cell. The following particles are moving from high concentration to low concentration and are using a carrier protein. How would you describe this type of movement across the membrane?
A. simple osmosis B. active transport C. simple diffusion D. facilitated diffusion