When does the human embryo implant in the wall of the uterus?
A) within a few hours of fertilization
B) about a day after conception
C) about a week after conception
D) just after gastrulation
C
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Microcystis aeruginosa is a species of cyanobacteria. What CANNOT be true of this species?
A. It synthesizes organic molecules. B. It is an obligate anaerobe. C. Its cells contain an extensive thylakoid. D. It uses ammonia to produce proteins. E. It secretes mucilage.
Which of the following processes can generate orthologous genes over evolutionary time?
A) protein cleavage B) transcription regulation C) gene duplication D) chromosomal inversion E) mutation that creates a new ATG
How can you determine the genotype of a plant showing the dominant phenotype of red color?
A. Cross the red plant with a white plant to see if any white plants appear. B. Cross the red plant with another red plant, and then cross the F1 population with each other to see if any white plants appear. C. Cross the red plant with other red plants to see if any white plants appear. D. The phenotype reflects the genotype, so the plant must be homozygous for the trait. E. Cross the red plant with a white plant to see if any red plants appear.
Which of the following parasites must be swallowed twice by the human host, first as an egg and later as a larva?
A. Schistosoma mansoni B. Taenia saginata C. Enterobius vermicularis D. Necatur americanus E. Ascaris lumbricoides