The haploid number of an organism is 20. A somatic cell from this organism has ________ chromosomes, and its gametes have ________ chromosomes
Fill in the blank(s) with correct word
40; 20
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Nucleic acids have a definite polarity, or directionality. Stated another way, one end of the molecule is different from the other end. How are these ends described?
A) One end has a hydroxyl group on the 2 carbon; the other end has a hydrogen atom on the 2 carbon. B) One end contains a nitrogenous base; the other end lacks it. C) One end has an unlinked 3 carbon; the other end has an unlinked 5 carbon. D) One end has one phosphate group; the other end has two phosphate groups.
SARS symptoms include ____
a. high fever, headaches, and respiratory problems b. brittle bones and rash c. heart arrhythmia, kidney failure, and calcium depletion d. liver cirrhosis and difficulty swallowing e. eye pain, loss of vision, and headaches
What is an exception to the standard biological species concept used to define a species?
A) Species that coevolved cannot be distinguished using this concept. B) Natural interbreeding populations cannot be distinguished using this concept. C) Asexual species cannot be distinguished using this concept. D) Species that do not resemble one another cannot be distinguished using this concept.
Organelles that breakdown hydrogen peroxide into water and oxygen are:
A. peroxisomes. B. plastids. C. lysosomes. D. liposomes. E. vacuoles.