Which of the following would you use to inhibit the contraction of muscle in vitro as a control for an experiment you are conducting?
A) a drug that increases sarcoplasm Ca2+ concentration
B) a motor protein ATPase inhibitor
C) a Ca2+-ATPase inhibitor
D) a drug that increases T-tubule depolarization
E) All would inhibit muscle contraction.
Answer: B
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Which of the following statements best discriminates among phylogenetic trees based on a maximum likelihood approach?
A. The preferred tree requires the fewest mutations to occur. B. The preferred tree requires the most mutations to occur. C. The preferred tree gives the lowest probability of producing the observed data. D. The preferred tree gives the highest probability of producing the observed data.
Dormant, thick-walled resting cells of cyanobacteria that are resistant to desiccation are called ________.
A. hormogonia B. thylakoids C. baeocytes D. akinetes
The combined sizes of prokaryotic and eukaryotic ribosomes are
a. the same. b. 30S and 50S, respectively. c. 40S and 60S, respectively. d. 70S and 80S, respectively.
If you remove the peptidoglycan layer from a Gram-positive cell, it would still stain purple with a Gram stain.
Answer the following statement true (T) or false (F)