The spindle apparatus begins to become visible during
a. anaphase.
b. metaphase.
c. interphase.
d. prophase.
e. telophase.
Answer: d
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Which RNA acts as an enzyme?
a. mRNA b. rRNA c. tRNA d. mRNA and rRNA e. rRNA and tRNA
Carotenoids are important to many plants because these pigments are able to:
A. remove carbon dioxide from the air B. absorb violet and blue-green wavelengths of light that are not absorbed by chlorophyll C. absorb water so that hydrolysis can be carried out in the chloroplasts D. store electrons for use during the "dark" reaction of photosynthesis E. capture UV radiation that is harmful to the DNA in the nucleus of plant cells
The predominant bacterial species that colonizes the human skin is
A. Staphylococcus epidermidis. B. Bacterioides fragilis. C. Candida albicans. D. Lactobacillus. E. Streptococcus pneumoniae.
Indicate the scenario(s) that could directly result in sympatric speciation. Check all that apply.A) Two sunflower species cross to form a healthy hybrid individual with equal copies of chromosomes from each parental species.B) A new river channel divides a population of beetles into two populations.C) A large fence blocks the intermingling of two populations of a species.D) A subset of flies within a larger population colonizes a new host plant.
What will be an ideal response?