Eukaryotes such as animal and plants cells differ from prokaryotes in that prokaryotes
lack a true nucleus.
lack true DNA.
use the cells membrane rather than ribosomes for making proteins.
contain numerous organelles.
undergo sexual reproduction.
lack a true nucleus.
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Which of the following is not a cellular function associated with the microtubule cytoskeleton?
A. muscle contraction B. mitosis C. organization of organelles D. movement of cilia or flagella
An increase in ADH production results in the production of a(n) ______ volume of ______ urine
a. increased; concentrated b. increased; dilute c. decreased; concentrated d. decreased; dilute e. either a or b, depending on the blood pressure
What are bacteroids?
a. specialized nitrifying bacteria b. small buds from ammonifying bacteria c. specialized bacteria that help some plant roots absorb phosphorus d. enlarged and immobilized nitrogen-fixing bacteria
You construct a life table for a plant species and find that in all cases about the same proportion of the cohort survive to the beginning of the next time interval. What would you call this?
A. a Type I survivorship curve B. populations regulated by density-independent events C. a Type III survivorship curve D. a Type II survivorship curve E. a semelparous life history adaptation