Which of the following functions like a fence to block membrane protein movement between the apical and basolateral regions of an intestinal epithelial cell plasma membrane?
A) gap junctions
B) desmosomes
C) adherens junction
D) hemidesmosomes
E) tight junction
Answer: E
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Before DNA, ____ likely served as the genetic material
a. RNA b. protein c. carbohydrate d. lipid e. free nucleotides
Pleiotropic genes
a. act on secondary sexual characteristics. b. influence more than one aspect of phenotype. c. are additive. d. produce lethal effects when homozygous. e. are none of these.
About 80% of all land plants, including grasses, shrubs, and trees, form mycorrhizae. Mycorrrhizae are which of the following?
A. associations between fungi and plant leaves B. associations between fungi and plant roots C. associations between bacteria and plant leaves D. associations between bacteria and plant roots E. associations between bacteria and fungi
The following data was obtained when testing the length of time to kill a particular non-spore-forming bacterial species at various temperatures. Identify the thermal death point of this bacterial species.
Temperature Time required to kill 50C 25 55C 20 60C 10 65C 8 A) 65C B) 20 minutes C) 60C D) 50C E) 55C F) 10 minutes