Which enzyme enables a retrovirus to convert its RNA genome into DNA?
A. DNA helicase
B. reverse helicase
C. DNA ligase
D. reverse transcriptase
Answer: D
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Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on the flower nectar and pollinating the flower. He offered a prediction that some species of pollinators would eventually be found that can feed and pollinate through the small tube. You decide to test Charles Darwin's proposal by placing nets over some orchids that allow small pollinators to enter, but prevent the large sphinx moth from entering. You then compare the number of seeds produced by plants with and without the nets. The seed production is
A. a hypothesis. B. a standardized variable. C. a theory. D. an independent variable. E. a dependent variable.
Meiosis II is similar to mitosis because _____
a. both result in the production of diploid daughter cells b. both result in the production of haploid daughter cells c. DNA replication immediately precedes both meiosis II and mitosis d. homologous chromosomes are separated in meiosis II and mitosis e. sister chromatids are separated in meiosis II and mitosis
Which of these describes the type of reproduction that is most adaptive in a rapidly changing environment with many different parasitic diseases present?
A) asexual reproduction because the currently successful genotypes can reproduce quickly B) asexual reproduction, because asexual reproduction uses less energy, which leaves more for each individual to adapt to the changing environment C) sexual reproduction because the diversity of genotypes increases the likelihood that there is one which can survive in a new environment D) sexual reproduction because this type of reproduction allows the production of a greater number of offspring thus providing more individuals to take advantage of any environmental challenges presented
Smooth muscle
A) contracts when stretched. B) is under voluntary control. C) does not contain actin or myosin. D) produces rapid contractions.