Consider the cell cycle of a human cell. During G2, what is the state of the homologous chromosomes?
A. The homologous chromosomes have not been replicated yet.
B. The homologous chromosomes are now in the haploid or n condition.
C. The homologous chromosomes have been pulled to their respective poles by the spindle apparatus.
D. The homologous chromosomes have all been copied through DNA replication and are beginning to condense.
E. The homologous chromosomes are lined up on the equator of the cell.
Answer: D
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Which of the following most adequately describes how the Alu element may have proliferated to constitute 10% of the human genome?
A. Multiple retroelements code the same gene. B. Retroelements increase with every generation. C. A single retroelement can be copied into many RNA transcripts. D. Retroelements increase with each cell division. E. Retroelements show self-proliferation.
The loss of an electron by a molecule is called __________. Fill in the blank(s) with the appropriate word(s)
Which of the following is NOT a characteristic of alveoli?
a. small overall surface area b. thin basement membrane c. surfactant production d. small diameter e. reduced surface tension to maintain opening
The bones in bat wings and those in the human arm are ____
a. homologous structures b. comparative structures c. analogous structures d. repetitive structures e. vestigial structures