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BIO 181 Exam 2- Questions & Answers
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BIO 181 Exam 2- Questions & Answers
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BIO 181 Exam 2- Questions & AnswersNuclear envelope Correct Ans-The double-layered membrane enclosing the nucleus of a cell.
Endoplasmic reticulum Correct Ans-A membrane network within the cytoplasm of cells
involved in the synthesis, modification, and transport of cellular materials.
Golgi apparatus Correct Ans-is found in most cells. It is another packaging organelle like the
endoplasmic reticulum (ER).
Lysosomes Correct Ans-an organelle in the cytoplasm of eukaryotic cells containing
degradative enzymes enclosed in a membrane.
Vacuoles Correct Ans-A membrane-bound organelle in the cytoplasm of most cells, especially
plant cells, containing water and dissolved substances such as salts, sugars, enzymes, and amino
acids.
Vesicles Correct Ans-a fluid- or air-filled cavity or sac, in particular.
Peroxisomes Correct Ans-are small, membrane-enclosed organelles that contain enzymes
involved in a variety of metabolic reactions, including several aspects of energy metabolism.
Cell membrane Correct Ans-the semipermeable membrane surrounding the cytoplasm of a
cell.
Steps of mitosis Correct Ans-prophase, metaphase, anaphase, telophase, and cytokinesis
, prophase Correct Ans-The first stage of mitosis, during which the chromosomes condense
and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at
opposite poles of the cell.
prometaphase Correct Ans-chromosomes complete migration to middle of cell
anaphase Correct Ans-The stage of mitosis and meiosis in which the chromosomes move to
opposite ends of the nuclear spindle.
telophase Correct Ans-The final stage of mitosis or meiosis during which the chromosomes of
daughter cells are grouped in new nuclei.
Cytokinesis Correct Ans-The division of the cytoplasm of a cell following the division of the
nucleus.
Steps of Meiosis Correct Ans-Prophase 1, Metaphase 1, Anaphase 1, Telophase 1 and
cytokinesis
Prophase 1 Correct Ans-In early prophase I each chromosome pairs with its homolog and
crossing over occurs
Metaphase 1 Correct Ans-In metaphase I, pairs of homologs line up at the metaphase plate,
with one chromosome facing each pole
anaphase 1 Correct Ans-pairs of homologous chromosomes separate
Telophase 1 Correct Ans-In the beginning of telophase I, each half of the cell has a haploid
set of chromosomes; each chromosome still consists of two sister chromatids
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