The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the
forest?
A) 5 trees per hectare
B) 10 trees per hectare
C) 20 trees per hectare
D) 25 trees per hectare
Answer: B
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A researcher synthesizes a new drug that specifically targets and degrades peptidoglycan. What type of infections could this drug treat? (Select all correct choices.)
A. infections caused by archaea B. infections caused by bacteria C. infections caused by viruses D. infections caused by eukaryotes
Which of the following were used in studies to test and support the hypothesis that high pressure forces phloem sap to flow?
a. radiolabelled sugars b. radiolabelled hormones c. aphids d. vacuum chambers
Both DNA and RNA
A) contain phosphate groups. B) contain the same four types of nitrogen-containing bases. C) are single-stranded molecules. D) have the same five-carbon sugars. E) cannot be present in a cell simultaneously.
What is the enzyme used in DNA replication that unwinds the supercoiled, packaged DNA
What will be an ideal response?