Which two groups of protists produce hard, mineralized skeletal structures or cell walls that contribute to marine sediments and form fossils?
A) green algae and brown algae
B) foraminiferans and radiolarians
C) dinoflagellates and diatoms
D) cellular slime molds and water molds
Answer: B
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The Kd values of antibody-to-antigen binding range from 10-12 M to 10-8 M. Antibody X binds to wild-type E. coli ssDNA-binding protein, showing a value of Kd =10-11 M
When antibody X binds to a mutant derived ssDNA-binding protein that contains a single amino acid substitution, a value of Kd = 10-7 M is determined. We can conclude that: A. the amino acid substitution has increased the affinity of antibody X. B. the amino acid substitution has decreased the affinity of antibody X. C. the amino acid substitution has increased the affinity of ssDNA-binding protein to DNA. D. the amino acid substitution has decreased the affinity of ssDNA-binding protein to DNA. E. None of these choices is correct.
The practice of using bacteria to remove pollutants from the environment is called ________.
A. Transduction B. Bioelimination C. Nitrogen fixation D. Bioremediaton
The release of cyclic AMP as a second
messenger is a response to
a. a peptide hormone. b. a steroid hormone. c. an amine hormone. d. a protein hormone. e. all of these except steroid hormone
Which two heterotrophic organisms most commonly derive nutrition from endosymbiotic relationships with photosynthetic protists?
1. ciliates 2. slime molds 3. parabasalids 4. reef-building coral animals 5. foraminiferans A) 4 and 5 B) 2 and 4 C) 3 and 4 D) 2 and 3 E) 1 and 2