At the current rate of habitat destruction, tropical rainforests will be reduced to ________ of their original size within 35 years, and ________ of species living there will go extinct
A) 10%; 50%
B) 1%; 90%
C) 50%; 50%
D) 90%; 95%
A
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Which of the following pairs is correctly matched?
a. middle lamella?cellulose b. integrins?receptors c. primary cell wall?pectin d. fibronectins?wood e. secondary cell wall?glycoproteins
Which form of speciation is thought to be most common?
A) allopatric speciation B) ecological speciation C) sympatric speciation D) haploploid speciation E) none of the above
Why is DNA replication said to be semiconservative?
a. because half of the DNA in a cell comes from one parent and half comes from the other parent b. because the number of nucleotides within genes remains constant c. because each new DNA molecule is composed of one old strand and one new strand d. because the same process of DNA replication is used by all organisms
What muscle is found on the anterior thigh and is a hip flexor/knee extensor?