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.
C. A single retroelement can be copied into many RNA transcripts.
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Crossing over is one of the most important events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. it decreases genetic diversity.
Fruit is produced from the development of the
a. egg. b. ovule. c. megaspore. d. endosperm. e. ovary
What cells are also called CD4 cells?
A) B cells B) suppressor T cells C) cytotoxic T cells D) plasma cells E) helper T cells
What factor most influences the dry deserts of Nevada?
A) the hot desert sun B) the Pacific Ocean C) overgrazing by livestock D) the rain shadow from a California mountain range