Which term refers to primary and secondary xylem that can no longer transport water and solutes, but which instead is strengthened dry tissue where some defensive compounds are stored?

a. sapwood
b. bark
c. vascular cambium
d. heartwood


Answer: d. heartwood

Biology & Microbiology

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The reference for bacterial descriptions and classifications is _____ Manual of Systematic Bacteriology.

A. Bergey's B. Koch's C. Leeuwenhoek's D. Pasteur's E. Lister's

Biology & Microbiology

Based on the population pyramid shown above, you would expect the Indian population to


The diagrams above show the age structures of India, the United States, and China.
A. decrease over time because births are low.
B. stay constant.
C. decrease because the death rate is higher than the birthrate.
D. grow but not stabilize.
E. grow and then begin to stabilize.

Biology & Microbiology

In later chapters, you will learn more about the regulation of gene expression.  One way to regulate gene expression is to make changes to the histone proteins to alter how tightly the DNA is coiled and wrapped.  The more tightly coiled and wrapped a particular region of DNA is, the less likely it is that the genes in that region will be expressed.  Bearing this in mind, how tightly do you think regions of heterochromatin are compacted?

A. loosely B. not at all C. very tightly D. moderately

Biology & Microbiology

RNA polymerase binds to the

A. regulation sequence. B. promoter sequence. C. termination sequence. D. start codon.

Biology & Microbiology