Compared to soils of other ecosystems, desert soils are characterized as having:a
high amounts of organic material and low mineral content.
b. low amounts of organic material and low mineral content.
c. high amounts of organic material and high mineral content.
d. low amounts of organic material and high mineral content.
e. moderate levels of both organic material and minerals.
D
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Which is a characteristic of retrotransposons, but not of DNA transposons?
A) include a gene that encodes reverse transcriptase B) may be present in a genome from one to millions of times C) found only in humans D) may not have a function in their host E) have short DNA sequences that are inverted repeats of each other on the ends
The region of the brain with the highest concentration of neurons is the ____
a. hypothalamus b. cerebrum c. cerebellum d. pons e. medulla oblongata
Osteoporosis is when what happens?
What will be an ideal response?
A skin cell of a red fox has 34 chromosomes. You look at the cell under a microscope and see that it has 34 chromosomes and one nucleus. Several hours later, you look at the same cell again and see that it has double the amount of DNA and one nucleus. A
little while later, you see that it has 68 chromosomes and two nuclei. What stage of the cell cycle was this cell in when you viewed it at each time point? A) First view: G1; second view: G2; third view: telophase B) First view: G1; second view: metaphase; third view: cytokinesis C) First view: S; second view: prophase; third view: cytokinesis D) First view: G0; second view: G2; third view: telophase