What might a sea turtle or seabird mistake a plastic bag for which makes plastic bags extremely dangerous?
a. Fish
b. Jellyfish
c. Seal
d. Kelp
b
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The difference in the appearance of the male and the female of the same species is called
a. polymorphism. b. sexual dimorphism. c. the dioecious condition. d. sexual selection. e. a primary sexual characteristic.
The resolution of a microscope is
1.the ratio between the size of an image and its actual size. 2.the ability to observe two close objects as separate from each other. 3.the same as magnification. 4.the ability to determine the color of an object. 5.None of the options is correct.
Which of the following is true about membrane filters?
A. It can be used only to remove organisms from liquids. B. It can be used only to remove organisms from liquids and it does not truly sterilize because it removes rather than kills microorganisms. C. It does not truly sterilize because it removes rather than kills microorganisms. D. It can't be depended on to remove all viruses from liquids.
One type of mutation involves the replacement of a purine with a purine, whereas another causes the replacement of a pyrimidine with a purine or the reverse. What general terms are associated with these two mutational phenomena?
What will be an ideal response?