All of the following characteristics are necessary for a structure to be classified as a primitive cell except
A. a boundary separating the cell from its watery surroundings.
B. DNA.
C. an ability to obtain energy from its surroundings.
D. macromolecules.
B. DNA.
You might also like to view...
Overproduction of the mineralocoticoid ______ causes excessive water retention
a. cortisol b. aldosterone c. epinephrine d. catecholamine e. ADH
Describe the maternal age effect associated with Down syndrome
What will be an ideal response?
________ are blocks of mesoderm that eventually form skeletal muscles of the neck and trunk, connective tissue, and vertebrae
Fill in the blank(s) with correct word
The obvious advantage of the lac operon is that it ________________________.
A. allows bacteria to survive in the presence of lactose B. eliminates the need for lactose-metabolizing enzymes when lactose is not present C. enables bacteria to make lactose only in the presence of the proper enzymes D. negates the need for milk in the diet of adult humans E. enables glucose to substitute for lactose in the diet of lactose intolerant persons