Which of the following statements about plasmids is false?
A) Plasmids are easily manipulated in the laboratory.
B) Molecular biologists often use plasmids to generate cell lines that make useful products for medical applications.
C) If present, plasmids are always essential to cell survival.
D) Plasmids are commonly shared among cells by horizontal gene transfer mechanisms.
E) Plasmids are nonchromosomal DNA segments found in bacteria and a number of eukaryotic cells.
Answer: C
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Fecundity is ____
a. a summary of the demographic characteristics of a population b. a group of individuals of similar age c. the average number of offspring produced d. the proportion of individuals alive at the start of an interval that die during that interval e. the proportion of individuals alive at the start of an interval that survive to the start of the next interval
Describe the difference between cohesion and adhesion, and how they combine to allow water to move
upward in plants.
What will be an ideal response?Megaplanktonic molluscs without a shell are called:
a. cephalopods. b. thecosome pteropods. c. gymnosome pteropods. d. nudibranchs. e. oceanic limpets.
Most biomass in trees is found in leaves, which do undergo photosynthesis
Indicate whether the statement is true or false.