Which of the following organelle is seen inside the nucleus of a cell?
a. mitochondria
b. centriol
c. nucleolus
d. ribosomes
Ans: c. nucleolus
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Water has an important stabilizing effect on temperature in living organisms and their environments
because as water absorbs heat, much of the energy is used to ____ instead of raising the temperature.
a. create hydrogen bonds b. create covalent bonds c. break surface tension d. break hydrogen bonds e. create hydration layers
Light energy arrives at Earth in little packets called ________.
A. photons B. light waves C. rays D. wavelengths
Which of the following is an example of alternation of generations?
A) A grandparent and grandchild each have dark hair, but the parent has blond hair. B) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte). C) A diploid animal produces gametes by meiosis, and the gametes undergo fertilization to produce a diploid zygote. D) A haploid mushroom produces gametes by mitosis, and the gametes undergo fertilization, which is immediately followed by meiosis.
MADS-box genes affect:
a. only flowers. c. leaves, roots, and flowers. b. segmentation in animals. d. early development.