Some biologists believe that life on Earth is in the midst of a sixth major mass-extinction event caused by

A) human activity.
B) a gradual decrease in global temperature.
C) loss of genetic diversity due to inbreeding.
D) coevolution of predator and prey species.
E) sustainable agriculture efforts.


A

Biology & Microbiology

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Several scientists, including Charles and Francis Darwin, Frits Went and others, demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments. Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?  

A.  Light caused a reduction in auxin concentration and a reduction in stem elongation on the lighted side of the plant stem, and thus a bending in the direction of the light. B.  The transport of auxin to the shaded side of the plant stem stimulated stem elongation and a bending in the direction of the light. C.  Auxin concentration was equal on both sides (lighted and shaded) of the stem; however, the apical meristem responded to the presence of light. D.  A combination of positive phototropism and a negative gravitropism. E.  The stems actually were responding to the agar blocks that had been used in the experiments.

Biology & Microbiology

Which of the following is not a characteristic of Saccharomyces cultures?

a. The cells are haploid. b. The cells have a relatively short generation time. c. Cells reproduce asexually by budding. d. The cells can be induced to reproduce sexually. e. All answers are true of Saccharomyces cultures.

Biology & Microbiology

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?

Biology & Microbiology

The accompanying figure is a micrograph of what kind of tissue?

a. cardiac muscle b. skeletal muscle c. smooth muscle d. cartilage e. dense connective

Biology & Microbiology