In the process of protoplast fusion, cells are grown in a medium that contains
A. chitinase for yeast.
B. RNAses.
C. DNA ligases.
D. lysozyme for bacteria.
E. either lysozyme or chitinase, depending on the type of cells.
Answer: E
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In response to global climate change, it is likely that some plant species will survive while others will go extinct. All of the following are explanations of this pattern except:
A. greenhouse gases are toxic, so increasing levels of these gases will cause some plants to go extinct. B. plants differ in their abilities to respond physiologically to persistent environmental change, and some will survive increased temperatures. C. temperatures may increase more rapidly than some species can adapt, which will lead to their extinction. D. some plants are able to migrate more effectively than others and can move into areas with more favorable conditions for survival. E. All of the answer options are correct explanations for the predicted pattern.
Birds and fish contain high amounts of yolk in their eggs. What can be said about cell cleavage during embryonic development in these animals?
A. It is meroblastic. B. It is holoblastic. C. It is complete. D. The blastula that forms involved cleavage through the entire egg. E. It is impossible for bird and fish eggs to undergo cleavage during development.
Many signal transduction pathways utilize second messengers to ____
a. transport a signal through the lipid bilayer of the plasma membrane b. relay a signal from the outside of the cell to the inside c. relay a signal from the inside of the cell to the outside d. decrease the message once the signaling molecules have left the receptor e. relay the message from the inner surface of the plasma membrane throughout the cytoplasm
The ________ is a shield-shaped endocrine structure in the front of the neck
Fill in the blank(s) with correct word