Ch.2 Cell Structure and more Flashcards
What is a function of the plasma membrane (envelopes entire cell.)
Provides a barrier for the cell; regulates movement of materials in and out of cell.
What are desmosomes?
intercellular junctions that provide strong adhesion between cells.
Cell junctions providing a channel allowing chemical substances to pass between cells are
gap junctions.
Cell junctions providing an impermeable junction encircling the cell, which inhibits movement between cells, are
tight junctions
Which is NOT a primary function of cell plasma membranes?
energy storage
Organelles are found in the
cytoplasm
Which would be diploid? - human eggs, neurons, or sperm
neurons
Which would NOT have chromosomes in pairs?
zygote
sperm
liver cells
neurons
sperm
Chromosomes go from consisting of one to two chromatids per chromosome during
interphase
what are the primary functions of the plasma membrane?
- physical boundary
- transporter of molecules and ions
- signal transduction
- enzymatic activity
From the 9th week of pregnancy until birth, the developing human is called a(n) ____.
fetus
What are the phases of the cell cycle?
G 1 : Cell growth
S : DNA replication
G 2: Preparation for mitosis
M : Cell Division - Prophase, metaphase, anaphase, telophase - cytokinesis ( not part of cell division)
The first major event of organogenesis is called___
neurulation
The early blastocyst cells that eventually form the placenta are called ______.
trophoblast
Derivatives of the mesoderm include
A single layer of tall and narrow cells lining your intestines comprises
simple columnar epithelium.
Which tissue provides strength while allowing compression? This tissue is found in your intervertebral disks, holding your vertebrae together but allowing compression when you jump up and down.
fibrocartilage
An exocrine gland that accumulates its secretion in a cell’s cytoplasm, with the cell bursting to release the secretion, is a
merocrine
Which type of glands produce perspiration on the soles of your feet when your shoes keep your feet too warm?
eccrine sweat glands
Cleavage as part of embryonic development is distinctive because it involves
cell division by mitosis with little or no growth between successive divisions.
