The type of cell-cell attachment that resembles quilting, with proteins acting as stitches, is _____.
-gap junctions
-tight junctions
-desmosomes
-selective adhesions
tight junctions
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Answer the following statements true (T) or false (F)
1. Bacterial conjugation is also called bacterial sex because there is an equal exchange of genetic information between two cells. 2. Plasmids can help bacteria grow faster. 3. The transfer of genes from dead bacteria to live bacteria is called transformation. 4. It has been difficult to create an effective vaccine against HIV because reverse transcriptase cannot correct its errors.
Imagine you conduct a parabiosis experiment with two strains of mice, one of which lacks a functional leptin gene (ob strain) while the other lacks a functional receptor for this hormone (db strain). Which of the following outcomes would you observe?
A. no weight change in the ob mouse B. no weight change in the db mouse C. increased body weight in the ob mouse D. decreased body weight in the ob mouse E. decreased body weight in the db mouse
Where are the light-independent reactions
occurring?
a. in the cytoplasm b. in the chloroplastic outer membrane c. in the thylakoid membrane d. in the stroma e. in the matrix
Why do aquatic systems seem particularly vulnerable to disruption by exotic consumers?
A) because higher temperatures result in faster population growth B) because humans typically ignore problems in aquatic systems C) because of the predominance of top-down control of community structure by consumers D) because of the low productivity of aquatic ecosystems