Members of the class ________, which include octopuses, squids, and nautiluses, are highly intelligent.
What will be an ideal response?
Cephalopoda
cephalopoda
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The genetic material (DNA) of eukaryotes is organized into
(a) centrioles. (b) spindles. (c) chromosomes. (d) microtubules.
The structure of bacterial chromosomes differs from that of eukaryotic organisms in all of the following except:
a. bacterial chromosomes are typically cir-cular. b. the genes are polycistronic. c. the bacteria have two copies of each chromosome. d. bacterial mutations are easily transmitted or inherited.
Component of cell walls, involved in maintenance of membrane structure.
Choose the letter of the best match: A. nitrogen B. calcium C. potassium D. phosphorus E. magnesium
In a bacterial cell, the three genes of the lactose operon are
A) expressed continuously. B) expressed when lactose synthesis is required. C) expressed only in the presence of lactose. D) never expressed, because they are pseudogenes.