A true cellular nucleus is found in
A. bacteria.
B. eukaryotic cells.
C. blue-green algae.
D. All of these answers are true.
B. eukaryotic cells.
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Lactobacilli are alkalophilic, preferring conditions that are slightly alkaline for optimal growth.
Answer the following statement true (T) or false (F)
Gamma irradiation
A. has not been approved for use on food. B. can be used to either sterilize or pasteurize, depending on the dose of radiation. C. leaves some radioactive particles in the treated substance. D. usually kills by generating heat and denaturing proteins.
A subordinate animal in a dominance hierarchy has limited access to food and mates. The most likely reason he
remains in a social group that dominates him is because ____.
a. he is exhibiting altruistic behavior b. his chances of survival and reproduction are better in the group than alone c. he expects to become dominant in the future d. he does not know that it would be an advantage for him to leave e. dominant group members will not allow him to leave
Which statement best describes the difference between cell division in plant and animal cells?
a. In animal cells but not plant cells, cytokinesis is accomplished by formation of a cleavage furrow. b. In plant cells but not animal cells, cytokinesis is accomplished by formation of a cleavage furrow. c. In plant cells, centrosomes have an important role in spindle formation, while in animal cells centrosomes do not function during cell division. d. In animal cells, replication of chromosomes occurs during interphase, while in plant cells replication occurs when the nuclear envelope disintegrates. e. Animal cells divide via the cell cycle whereas plant cells divide by binary fission.