The purity of illicit drugs varies, so
a) drugs should be tested to ensure purity.
b) some drugs may not harm the fetus.
c) drug users can never be sure what they are ingesting.
d) they do not pose risks to the fetus.
Answer: c) drug users can never be sure what they are ingesting.
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What structures in the cell of a fungus are not present in animal cells?
a. cell walls of cellulose and chloroplasts b. cell walls of cellulose c. cell walls of chitin and chloroplasts d. cell walls of chitin
Which of the following is an example of post-translational control?
1.Phosphorylation of enzymes 2.The rate at which mRNA passes through the pores of the nuclear envelope 3.How long mRNA persists in the cytoplasm 4.Polytene chromosomes
Answer the following statements true (T) or false (F)
1.The tendency to concentrate sensory organs and brain at the head end of an animal is called cephalization. 2.Centipedes, earthworms, and roundworms all illustrate segmentation. 3.An animal with an indirect development undergoes a metamorphosis in which larvae do not resemble the adult. 4.Flatworms have complete digestive tracts. 5.Flatworms have bilateral symmetry.
Members of the group A streptococci (GAS) cause all of the following EXCEPT
A) strep throat. B) scarlet fever. C) rheumatic fever. D) pharyngitis. E) epiglottitis.