The apical ends of intestinal cells face the intestinal channel and have long processes that facilitate the absorption of nutrients. What is the name of these processes and what cytoskeletal element forms their internal skeleton?
A) microvilli, microtubules
B) villi, microtubules
C) microvilli, actin filaments
D) villi, actin filaments
E) microvilli, intermediate filaments
Ans: C) microvilli, actin filaments
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The polarity of a water molecule is due to:
a. the greater number of hydrogen atoms relative to oxygen. b. the uneven attraction of electrons to the oxygen atom. c. the uneven attraction of electrons to the hydrogen atoms. d. the uneven attraction of protons to the oxygen atom. e. the number of neutrons in the nucleus.
The Human Genome Project, which got underway in 1990, is an international effort to ________
A) collect samples of cells from all parts of the world in order to preserve human genetic diversity B) clone deleterious genes from humans and study their mode of action C) clone beneficial genes from humans for eventual use in gene therapy D) construct a physical map of the billions of base pairs in the human genome E) determine how many different human populations share in a common gene pool
When two adjacent thymine molecules are joined by a covalent bond as a result of exposure to UV light, this structure is referred to as a
Thymine couplet Thymine dimer Thymine duplex Thymine doublet
Through which process are bacteria able to exchange genetic material?
A) Sexual reproduction B) Photosynthesis C) Conjugation D) Anaerobic respiration E) Endospore formation