Which of the following is require for natural selection to occur in a population?
A. variation in the population
B. inheritance of variation through genetic differences
C. differential reproduction so that the more fit individuals have more offspring that survive to reproduce
D. accumulation of beneficial traits so that they increase in the population
E. all of the choices are required
Ans: E. all of the choices are required
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In most fungi, karyogamy does not immediately follow plasmogamy, which consequently _____
A) means that sexual reproduction can occur in specialized structures B) results in multiple diploid nuclei per cell C) allows fungi to reproduce asexually most of the time D) results in heterokaryotic or dikaryotic cells E) is strong support for the claim that fungi are not truly eukaryotic
You recently discovered a new element, and find that this particular element has one electron its outer energy level. What would you expect will happen to an atom of this element if placed in water?
A. It will gain an electron forming a positive ion. B. It will lose an electron forming a negative ion. C. It will lose an electron forming a positive ion. D. It will gain an electron forming a negative ion.
-_____ are symbionts with young roots that enhance
a plant’s ability to absorb mineral ions from soil. Fill in the blank(s) with the appropriate word(s).
Which of the following has the smallest size?
A neutron A molecule of glucose An atom of oxygen A cell