Which of the following is present during meiosis but not mitosis?
A. a chromatid
B. a centromere
C. a spindle
D. a tetrad
E. sister chromatids
Answer: D
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What is a homeobox?
A. a cluster of homeotic genes B. a sequence within a homeotic gene that encodes the DNA-binding portion of a transcription factor C. the portion of the promoter to which a homeoprotein binds to activate transcription of genes important for development D. an enhancer region needed for expression of a homeotic gene E. none of these are correct
A new mRNA can pass through the pores of the nuclear membrane into the cytoplasm only if ________
a. it has been phosphorylated b. it has been processed c. motor proteins attach to a base sequence and link the molecule to cytoskeletal elements d. proteins attach to a base sequence near the poly-A tail and temporarily block translation
________ is the study of populations
Fill in the blank(s) with correct word
Compare and contrast Creutzfeld-Jakob disease (CJD) variant CJD, and kuru with regard to: a) causative agent, b) transmission, c) reservoir, d) pathogenesis and symptoms, and e) methods for prevention.
What will be an ideal response?