Which phenomenon is a likely consequence of thinning of the ozone layer?
A) more occurrences of skin cancer
B) greater escape of heat from Earth
C) global warming
D) smaller flying insect populations
Answer: A
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What is a helix-turn-helix motif and what are the roles of helix-2 and helix-3 in recognizing DNA?
What will be an ideal response?
The direction of genetic information transfer in a retrovirus (such as HIV) is
A. RNA to DNA to mRNA to protein. B. RNA to mRNA to protein. C. RNA to protein. D. DNA to protein. E. DNA to mRNA to protein.
The two polynucleotide chains in a DNA molecule are attached to each other by
A) covalent bonds between carbon atoms. B) covalent bonds between phosphates and sugars. C) peptide bonds between amino acids. D) hydrogen bonds between bases. E) ionic bonds between "R" groups in amino acids.
Which of the following statements regarding cells is false?
A) All cells are enclosed in a membrane that maintains internal conditions different from the surroundings. B) All cells have a cell wall. C) All cells can interconvert forms of energy. D) All cells have DNA as their genetic material.