Consider the cell cycle of a human cell. During G2, what is the state of the homologous chromosomes?
A. The homologous chromosomes have been pulled to their respective poles by the spindle apparatus.
B. The homologous chromosomes have not been replicated yet.
C. The homologous chromosomes are lined up on the equator of the cell.
D. The homologous chromosomes are now in the haploid or n condition.
E. The homologous chromosomes have all been copied through DNA replication and are beginning to condense.
Answer: E
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The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are the ? form. Which of the following could amylase break down?
A) starch B) cellulose C) chitin D) starch and chitin only E) starch, cellulose, and chitin
Which species is overexploited rather than invasive?
A. zebra mussels in the Great Lakes B. brown tree snakes in Guam C. bison in the North American plains D. marine toads in Florida E. gypsy moth caterpillars in North America
The substance indicated as “B” is a(n)
a. inhibitor. b. activator. c. substrate. d. coenzyme. e. cofactor.
Anatomical homology in vertebrate forelimbs is considered to be evidence for evolution because:
a) similarities among vertebrate forelimbs suggest that they have evolved convergently. b) differences among vertebrate forelimbs suggest that they evolved independently. c) the anatomy of the vertebrate forelimb is not currently under natural selection. d) similarities among vertebrate forelimbs suggest that they evolved from a common ancestor. e) all vertibrate skeletons have forelimbs