Two boys are on a camping trip and need birch bark to start their cooking fire. They cleanly remove a six-inch strip of bark from around the entire circumference of the trunk. Explain what eventually will happen to this tree

What will be an ideal response?


The tree will die from starvation. By removing the bark (girdling) the phloem is removed and the roots will eventually starve.

Biology & Microbiology

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Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of _____

A) purines is always larger than the number of pyrimidines B) pyrimidines is always larger than purines C) cytosines is always the same as adenines D) guanines is always the same as thymines E) purines is always the same as pyrimidines

Biology & Microbiology

In standardized DNA fingerprinting used in the United States, ____

a. 13 different noncoding loci are examined b. 13 different coding loci are examined c. only loci that do not vary among individuals are examined d. only long tandem repeats loci are examined e. the sequence of short tandem repeats is determined

Biology & Microbiology

Which blood cell type is correctly matched to its function?  

A.  monocytes—defense against microorganisms B.  erythrocytes—immunity C.  leukocytes—blood clotting D.  platelets—hematopoiesis E.  leukocytes—oxygen transport

Biology & Microbiology

The neural circuit that allows a male stickleback fish to orient and behave aggressively towards an inanimate object with a red stripe is an example of a(n)

A. stimulus-response chain. B. supernormal stimulus. C. innate releasing mechanism. D. sign stimulus. E. fixed action pattern.

Biology & Microbiology