A scientist wants to magnify a pollen grain 8,000 times and examine the ridges and pores on its surface. Which of the following instruments would be best?
A) a transmission electron microscope
B) a scanning electron microscope
C) a fluorescence microscope
D) a light microscope
Answer: B
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Which of the following CANNOT undergo microevolution?
A. a poison ivy vine growing up a tree B. the cactus finches of the Galápagos Islands C. the Venus Flytraps in Green Swamp in southeastern North Carolina D. the corals in a reef off the east coast of Australia E. the fire ants endemic to South America
A physician reports to you the lab results in identifying your genetic condition relating to your skin health. "DNA fingerprint" information indicates that you have two different versions of the allele for a particular skin protein, and this is called
a. heterozygous. b. homozygous. c. dominant. d. homologous. e. recessive.
Sickle-cell disease is a recessive genetic disease. This means
A. at least one copy of each recessive allele must be present for each gene involved in sickle-cell disease in order for the disease to be expressed. B. two copies of the recessive allele must be present in order for the disease to be expressed. C. the environment can alter the expression of recessive genes, meaning any combination of alleles can cause the disease if the right environmental conditions are encountered. D. only one copy of the recessive allele must be present in order for the disease to be expressed.
DNA sequencing data from the Human Genome Project indicates that there are about ________ protein-coding genes.
A. 100,000 B. 140,000 C. 20,000 D. 30,000