A single cell in a smoker's lung has become cancerous. It doubles its DNA and divides much faster
than a normal lung cell. The most likely change that would have caused this condition took place inthe:a.
nucleus.
b. nucleolus.
c. microtubule.
d. mitochondria.
e. lysosome
A
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Which of the following lipids makes up most
of a plasma membrane?
a. phospholipids b. cholesterol c. triglycerides d. steroids e. more than one of these
Which of the following statements would be LEAST acceptable to most zoologists?
A) The first fossils resembling lancelets appeared in the fossil record around 530 million years ago. B) Recent work in molecular systematics supports the hypothesis that lancelets are the basal clade of chordates. C) The extant lancelets are the immediate ancestors of the fishes. D) Lancelets display the same method of swimming as do fishes.
Scabies is a skin disease caused by a
A) slow virus. B) protozoan. C) mite. D) bacterium. E) prion.
Answer the following questions true (T) or false (F)
1. If something is oxidized, it loses electrons. 2. The human genome is estimated to include 20,000 to 25,000 genes. 3. Anaphase is characterized by the separation of sister chromatids.