Which syndrome is characterized by a karyotype with 45 chromosomes?
a. Turner
b. Down
c. androgen insensitivity
d. Klinefelter
e. cri-du-chat
ANSWER: a
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Compared to the cytoplasm, the mitochondrial matrix could be described as having ____
a. a low pH and high pyruvate concentration b. a high pH and high pyruvate concentration c. a low pH and low pyruvate concentration d. a high pH and low pyruvate concentration e. the same pH and pyruvate concentration
How many fossil species have been collected?
a. 500,000 b. 125,000 c. 250,000 d. 100,000 e. 1.2 million
Which of the following is false concerning eugenics?
A. The eugenics movement passed laws meant to eliminate bad genes from the human gene pool. B. Supporters of eugenics encouraged sterilization of the unfit. C. Eugenics methods have been highly successful in reducing the frequencies of bad recessive alleles from the human population. D. Eugenics methods have been unsuccessful, because recessive alleles are hidden in the heterozygous condition and can be passed on to offspring.
You discover a fungus that contains a strange star-shaped organelle not found in any other eukaryotic cell you have seen. On further investigation, you find the following
1. The organelle possesses a small genome in its interior. 2. The organelle is surrounded by two membranes. 3. Vesicles do not pinch off from the organelle membrane. 4. The interior of the organelle contains proteins similar to those of many bacteria. 5. The interior of the organelle contains ribosomes. How might this organelle have arisen?