BIO 1305 Fernandez-Luna Exam 3 Questions & Answers
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Course
BIO 1305 Fernandez-Luna
Institution
BIO 1305 Fernandez-Luna
why is cellular signaling important in large organisms? - ANSWERSto allow cells to respond to stimuli
local signaling - ANSWERSsignaling molecules are secreted by the signaling cell. some molecules travel only short distances; such local regulators influence cells in the vicinity.
long distan...
BIO 1305 Fernandez-Luna Exam 3
Questions & Answers
why is cellular signaling important in large organisms? - ANSWERSto allow cells to
respond to stimuli
local signaling - ANSWERSsignaling molecules are secreted by the signaling cell. some
molecules travel only short distances; such local regulators influence cells in the vicinity.
long distance signaling - ANSWERSsignaling between cells separated by some
distance (exocrine)
intracellular signaling - ANSWERSreceptor is inside of cell. ligand must enter cell
extracellular signaling - ANSWERSspecific signaling molecule or environmental
stimulus
second messenger - ANSWERSA small, nonprotein, water-soluble molecule or ion,
such as calcium ion or cyclic AMP, that relays a signal to a cell's interior in response to
a signal received by a signal receptor protein.
how are genes passed on from one generation to the next? - ANSWERSsexual or
asexual reproduction carried by chromosomes
how do sexual and asexual reproduction differ? - ANSWERSsexual involves crossing
over and gene assortment, while asexual uses mitosis/binary fission and there is no
crossing over.
karyotype - ANSWERSlayout of chromosomes after duplication
homologs - ANSWERSmatching chromosome pairs
autosomes - ANSWERSnon-sex chromosomes (1-22 in humans)
prophase I - ANSWERScrossing over occurs; doubling of centrioles. 2 chromosomes
per cell and 4 DNA molecules
metaphase I - ANSWERShomologs line up at the plate; 2 chromosomes and 4 DNA
molecules
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