An array of organisms together with their physical environment is referred to as a(n) ____
a. population
b. community
c. ecosystem
d. biosphere
e. landscape
ANSWER: c
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Organisms traditionally called mushrooms, as well as shelf fungi, coral fungi, bird's nest fungi,
stinkhorns, and puffballs, are all members of which fungal phylum?
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
Which soil layer is rich with decomposed organic material?
a. H Horizon b. A Horizon c. B Horizon d. C Horizon e. bedrock
What are the three structures that add secretions to the sperm to make up semen?
A) seminal vesicles, Leydig cells, and prostate gland B) prostate gland, seminal vesicles, and seminiferous tubules C) bulbourethral glands, Leydig cells, and seminal vesicles D) seminal vesicles, prostate gland, and bulbourethral gland
Scientists can determine the size of DNA fragments through a process known as gel electrophoresis. In this process, DNA is loaded into a gel submerged in a liquid buffer through which an electric current is run. Large DNA molecules move slower and can be observed at the top of the gel, whereas smaller DNA fragments move faster (and are seen at the bottom of the gel). Based on what you know about the properties of DNA, how is the electric current arranged in this process?
a. Since DNA is negatively charged, the positive end is placed at the top of the gel, and the negative end is placed at the bottom of the gel. b. Since DNA is negatively charged, the negative end is placed at the top of the gel, and the positive end is placed at the bottom of the gel. c. Since DNA is positively charged, the negative end is placed at the top of the gel, and the positive end is placed at the bottom of the gel. d. Since DNA is positively charged, the positive end is placed at the top of the gel, and the negative end is placed at the bottom of the gel. e. Since DNA is uncharged, the placement of the positive end and negative end does not matter.