Homologous chromosomes pair with each other during meiosis, but are misaligned. Which of the following is a possible outcome if crossing over occurs?
A. One daughter chromosome contains a gene duplication.
B. One daughter chromosome contains a gene deletion.
C. Two daughter chromosomes each contain a gene duplication.
D. Two daughter chromosomes are normal.
E. One daughter chromosome contains a gene duplication, one daughter chromosome contains a gene deletion, and two daughter chromosomes are normal.
E. One daughter chromosome contains a gene duplication, one daughter chromosome contains a gene deletion, and two daughter chromosomes are normal.
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The three domains of life are
a. eukaryotes, prokaryotes, and viruses. b. animals, plants, and microorganisms. c. Prokaryota, Eukaryota, and Protoctista. d. Archaebacteria, Eubacteria, and Eukaryota. e. Archaea, Bacteria, and Eukarya.
________ is the term used to describe the condition of a cell containing a chromosome number that is not a multiple of the haploid number
Fill in the blank with correct word.
Which of the following is a unique organelle found within some protists but not in higher animal cells?
A. Mitochondrion B. Contractile vacuole C. Endoplasmic reticulum D. Golgi apparatus
Organic macromolecules may have formed by ____
a. addition of water to small organic subunits to facilitates enzymatic synthesis reactions b. dehydration synthesis reactions that combined smaller subunits into larger molecules c. increasing availability of inorganic compounds d. sequestration inside a semi-permeable membrane e. spontaneous aggregation of the different organic compounds in the atmosphere