Cell Structure
- Because the oxygen atom in H 2 O has a stronger
attraction for the electrons in the H-O bond than the
hydrogen atom do, the oxygen atom^
has a slightly charge and the hydrogen atoms
have a slightly^
charge.^
- Ionically bonded molecules are called^
, whereas covalently bonded
molecules are called mol-ecules. - The nuclear membrane or envelope is composed of
two membranes; the outer membrane is generally^
continuous with the^ , which^
often has ribosomes attached to it.^
- The fluid medium of the nucleus is specifically^
called^.^
11. During cell division, chromatin condenses-
into thick rodlike structures called^
, which become visible
with a light microscope.^
- A spherical particle within the nucleus that
does not^ have a covering membrane is the^
; it is the site of ribosome^
synthesis.^
- The convolutions of the inner membrane of the^
-mitochondrion are called^.^
14. are small bodies in the cytoplasm that contain
enzymes that enhance the breakdown of cellular
components.^
- When the membrane-bound cavities of the endo-
plasmic reticulum are channel-like or sac-like, they^
are called. (^)
16. The seems to function as (^)
a point within the cell where compounds to be (^)
secreted by the cell are collected and concentrated (^)
and where carbohydrates are synthesized. (^)
17.^ Protein synthesis occurs at the^ ,^
which are composed of RNA and protein and are
not surrounded by a membrane.
55
- The interior of chloroplasts consists of many stacks of
membranes called.^ - Internally, a flagellum is composed of^
double fibrils arranged in
a cylindrical ring around^
central single fibrils.^ - Centrioles form the , which distribute the daughter
chromosomes during cell division to the daughter
cells.
MATCHING
Place the most appropriate number in the blank
provided.Mitochondrion 1. Lysosomes
Muscle cells 2. Lacteals
Enzymes 3. Protein synthesis
Sex hormone 4. Redistribute
synthesis chromosomes
Ribosomes 5. Powerhouse of the cell
Chloroplas 6. Locomotion
Centriole 7. Carotenoid pigments
Flagella 8. Cisternae
Cell wall 9. Many cristae
Channels of 10. Agranular endoplasmic
the ER reticulum- Cellulose
- Site of photosynthesis
Search and Explore
● Search the Internet using “cell biolo-gists”
as a key word and discover cell biology
experts and their research. Give an oral
presentation on your findings.Study Tools
Study Guide Activities for Chapter 3
Online Resources PowerPoint presentations