If life exists or originated on another planet, most scientists today believe that it is which of the following planets?
a. Mars
b. Saturn
c. Neptune
d. Venus
Ans: a. Mars
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Exposure to light redistributes auxin to the opposite side of the stem or root that is exposed to light. In stems, this redistribution of auxin results in the stem growing and bending toward the light
In contrast, roots bend away from the light as they grow. What may be an advantage of the difference in bending of roots and stems? A. When stems bend toward the light as they grow, the leaves will shade the stem and keep it from getting too hot. B. When roots grow away from the light, they will grow deeper into the soil where they can absorb water and nutrients. C. When roots grow away from the light, the root cap will not be lost. D. When roots grow away from the light, light sensitive statoliths drive the bending of the cells back to the ground.
Which of the following best describes the relationship between an antibody and an antigen?
a. An antibody is one response to an antigen. b. An antibody is produced by T cells and an antigen is a foreign protein. c. An antigen is presented by antigen presenting cells to plasma cells, which produce antibodies. d. An antigen is a disease-causing organism, and antibodies are produced by B cells. e. An antibody induces antigen formation.
By the year 1980, a wolf species (Canis rufus) once common to the southeastern region of the United States disappeared from all areas except for one small part of eastern Texas. This is an example of
A) extirpation. B) extinction. C) species invasion. D) genetic diversity.
Cycle of reactions in mitochondria that begins with citric acid. This cycle breaks down an acetyl group and produces CO2, ATP, NADH, and FADH2; also called the Krebs cycle.
What will be an ideal response?