Which is a difference between prokaryotes and eukaryotes?
A) Prokaryotes have DNA, whereas eukaryotes have RNA.
B) Prokaryotes have a nucleoid, whereas eukaryotes have a nucleus.
C) Prokaryotes have RNA, whereas eukaryotes have DNA.
D) Prokaryotes have a nucleus, whereas eukaryotes have a nucleoid.
E) Prokaryotes have a cell wall, but eukaryotes do not.
B
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Match the following names with the correct statements.
_______1. This German scientist proposed the theory of biogenesis—that life can arise only from preexisting life. _______2. This Dutchman built single lens microscopes as a hobby and is believed to be the first person to see live bacteria and protozoa. _______3. This German physician developed a step-by-step scientific method to prove that a particular microorganism causes a particular disease and contributed to what is known as “the germ theory of disease.” _______4. This French scientist discovered that microorganisms are responsible for fermentations, contributed to disproving abiogenesis, and contributed to what is known as “the germ theory of disease.” a. Robert Koch b. Louis Pasteur c. Rudolf Virchow d. Antony van Leeuwenhoek
How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when the traits behave in a dominant and recessive pattern? How many phenotypes?
A. 64 genotypes; 16 phenotypes B. 16 genotypes; 64 phenotypes C. 8 genotypes; 27 phenotypes D. 27 genotypes; 8 phenotypes
The dark chemical that accumulates in the skin after exposure to the sun is called ________
A) melanocyte B) sebum C) melanin D) carcinoma
Which of the following statements best describes the life cycles of streptophyte algae and plants?
A. The haploid generation of streptophyte algae is multicellular, whereas the diploid generation of plants is unicellular. B. The haploid and diploid generations of both steptophyte algae and plants are unicellular. C. The diploid generation of streptophyte algae is multicellular, whereas the diploid generation of plants is unicellular. D. The haploid and diploid generations of both streptophyte algae and plants are multicellular. E. The diploid generation of streptophyte algae is unicellular, whereas the diploid generation of plants is multicellular.