Some protists bear a small number of external cellular structures that facilitate swimming by repeatedly bending and straightening. These protists are informally known as:
A. amoebae
B. ciliates
C. algae
D. periphyton
E. flagellates
E. flagellates
Biology & Microbiology
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Crossing-over between homologous chromosomes occurs at which of the following stages of meiosis?
A) S phase B) prophase I C) metaphase I D) anaphase I E) prophase II
Biology & Microbiology
Endosymbiotic theory states that the organelles of eukaryotic cells originated from mutualistic relationships between two prokaryotic cells
1.True 2.False
Biology & Microbiology
Identical copies of genes that can be transcribed simultaneously are called
A. pseudogenes. B. expressed sequences. C. tandem clusters. D. multigene families. E. segmental duplications.
Biology & Microbiology
How is the V gene promoter, which is inactive in immature lymphocytes, activated?
What will be an ideal response?
Biology & Microbiology