In the Northern Hemisphere, recall that atmospheric CO2 levels are highest in early spring and lowest during early fall. What accounts for this seasonal fluctuation in atmospheric CO2 levels? Select all that apply
A. photosynthesis
B. human activities
C. respiration
D. biomineralization
E. plate tectonics
A
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What is the pH of a solution that contains 0.2 M H2CO3 (carbonic acid) and 0.2 M NaHCO3? The pKa of carbonic acid is 6.4
A. 6.7 B. 6.4 C. 6.0 D. 5.8 E. 5.3
Which of the following is NOT a characteristic of shade leaves on a plant?
A. more chlorophyll production B. less mesophyll tissue C. more air spaces D. lacking an epidermal layer E. lacking mesophyll tissue
Clonal libraries used to determine the sequence of a microbial genome using the whole-genome shotgun approach are typically generated by ________.
A. cloning small gene-sized DNA fragments produced by breaking chromosomal DNA with ultrasonic waves B. cloning random PCR fragments amplified from genomic DNA C. cloning large DNA fragments produced by breaking chromosomal DNA with ultrasonic waves D. cloning large DNA fragments produced by restriction endonuclease cleavage
The stalk of Caulobacter increases in the surface area of the cell, which facilitates absorption of nutrients from nutrient poor environments.
Answer the following statement true (T) or false (F)