Which of the following methods can plants use to acquire immobile nutrients (e.g., zinc) or nutrients not in readily accessible forms (i.e., the nitrogen in N2)? Select all correct choices
A. Plants can introduce acid-like compounds
into the soil.
B. Plants can form symbiotic relationships
with bacteria.
C. Plants can form symbiotic relationships
with fungi.
D. Plants can introduce protons into the soil.
A,B,C,D
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IgG is the:
a. first antibody produced when an invading microorganism is initially encountered. b. antibody that is associated with various parasitic infections. c. antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes. d. second antibody produced when an in-vading microorganism is initially encoun-tered and the most abundant.
DNA molecules, regardless of size, have a net positive charge
Indicate whether the statement is true or false
The allele that causes Huntington's disease is expressed earlier in life when it is inherited from the father than when it is inherited from the mother. Huntington's disease is an example of
A. an X-linked trait. B. pleiotropy. C. gene imprinting. D. linkage.
A scientist hypothesizes that a new drug turns on a certain gene in a skin cell. Which of the following experiments would be the best to test her hypothesis?
A) Use qPCR to measure the initial levels of gene expression in skin cells, treat skin cells with the drug and measure the levels of gene expression, and then compare the two measurements. B) Use qPCR to measure the levels of gene expression in skin cells after exposure to the drug. C) Use qPCR to measure the initial levels of gene expression in muscle cells, treat skin cells with the drug and measure the levels of gene expression, and then compare the two measurements. D) Use qPCR to measure the levels of gene expression in skin cells after exposure to the drug and then add another drug to turn off gene expression and use qPCR to measure the levels of expression.