Which of the following is a principle of nature that leads to natural selection?
A. Due to competition for limited resources, more offspring are produced than are able to survive
B. Characteristics are passed from parents to offspring
C. The characteristics vary among the offspring, and this variation is inheritable
D. All of the above
E. None of the above
D. All of the above
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A parasitic disease known as Schistosomiasis is caused by several species of flatworms in the
phylum Platyhelminthes. The life cycle includes an aquatic snail where the larvae develop; these larvae then hatch into the water and swim around until they find the appropriate vertebrate host. Adult males and females reproduce sexually in the vertebrate host, and eggs are usually shed into water via feces or urine. The snail would be considered a(n) __________.
a. intermediate host b. vector c. primary host d. cyst
The preprophase band is specific to plant cells, and:a
appears after mitosis begins. b. forms inside the nucleus. c. determines the plane of cell division d. is found in both plant and animal cells. e. is composed of cellulose
Risks for Q fever include contact with infected cattle and drinking unpasteurized milk
Indicate whether the statement is true or false
In general, the organization of genes in bacteria is different from that in eukaryotes. In E. coli, approximately 27 percent of all genes are organized into contiguous, functionally related units containing multiple genes under coordinated control that
are transcribed as a single unit. Such contiguous gene families are called ________. A) operons B) transcriptomes C) proteomes D) pseudogenes E) contigs