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55 terms

cell biology part two

STUDY
PLAY
what organelle forms spindle during cell division
centrioles (looks like flower)
main job of ribosome
build polypeptides in protein synthesis
job of free ribosomes and where found
manufacture proteins for cell in cytoplasm
job of fixed ribosome and where found
manufacture proteins for secretion attached to ER
proteasomes
disassemble damaged proteins for recycling
membraneous organelles (5)
ER
golgi apparatus
lysososmes
peroxisomes
mitochondria
Water molecules and small ions enter a cell through
integral protein channels
Diffusion of a substance across the cell membrane is influenced by all the following EXCEPT
(a) lipid solubility
(b) hydrolysis of ATP
(c) concentration gradient
(d) electrical charge.
B hydrolysis of ATP
The movement of oxygen from an area of high concentration to an area of low concentration is an example of
diffusion
Two types of vesicular transport
endocytosis and exocytosis
Interphase of the cell cycle can be divided into
G1, S, and G2
The shoulder is ______to the elbow
proximal
The ventral cavity contains the
pericardial cavity pleural cavity peritoneal cavity
isotopes of an element differ in the number of
neutrons in the nucleus
the mass number represents the number of
protons and neutrons
the weakest bond between two atoms is the_____________ bond
hydrogen
ionic bonds are formed when
atoms share electrons
ions with a negative charge are called
anions
All of the following are true concerning enzymes, EXCEPT that they
(a) function as biological catalysts
(b) lower activation energy
(c) are proteins
(d) are consumed by the reaction.
d
16. The rate of a chemical reaction is influenced by the (a) temperature
(b) presence of catalysts
(c) concentration of reactants (d) all of these.
d
which of the following is not a function of protein
(a) support
(b) metabolic regulation
(c) storage of genetic information (d) transport.
c
if a substance has a pH that is less than 7 it is:
acidic
glucose is stored in liver and muscles in the form of
glycogen
An example of an inorganic substance is
(a) glycerol
(b) water
(c) fructose
(d) all of these.
b
a fatty acid that does not contain double covalent c=c bonds is called
saturated
Most of the fat in the human body is in the form of
(a) phospholipids
(b) cholesterol
(c) triglycerides
(d) prostaglandins
c
Glycoproteins and proteoglycans are combinations of amino acids and
(a) fatty acids
(b) carbohydrates
(b) lipids
(d) all of these.
b
A buffer will
(a) make a solution more basic (b) enhance changes in the pH of the solutions
(c) resist drastic changes in the pH of the solutions
(d) have no effect on the pH of the solutions.
c
An amino acid is to protein as _____ is to a nucleic acid is to DNA. (a) a purine
(b) a nucleotide
(c) protein
(d) none of these.
b
RNA differs from DNA in that (a) RNA is single stranded
(b) RNA contains uracil and DNA contains thymine
(c) RNA contains ribose while DNA contains deoxyribose
(d) all of these.
d
the DNA double helix is held together by
hydrogen bonds
Functions of the plasma membrane include all of the following EXCEPT
(a) structural support
(b) separation of the cytoplasma from the extra cellular fluid
(c) regulation of exchange of material
(d) thermal insulation.
d
the plasma membrane is composed of:
phospholipid bilayer
Functions of the glycocalyx include
(a) binding extracellular compounds
(b) lubricating and protecting the cell membrane
(d) identifying the cell to the immune system
(d) all of these.
d
amino acids are brought to the ribosome by
tRNA
what component of the cytoskeleton moves chromosomes during cell division?
microtubles
ribosomes are composed of
RNA and protein
the triplet codes needed to specify a polypeptide chain are found in the
gene
The mRNA sequence that is complementary to the sequence ATC on DNA is
UAG
Before the mRNA transcribed from a gene can be used for protein synthesis it must be
edited to remove introns, transported to cytoplasm
the construction of a function polypeptide by using mRNA is called
transcription
the movement of water across a membrane from low solute concentration to higher solute is called
osmosis
white blood cells engulf bacteria in the process called
phagocytosis
site of lipid synthesis
smooth endoplasmic reticulum
autolysis
self destruction of damaged cells
mitochondria use _________ to break down food and produce ________.
oxygen ATP
contents of nucleus (4)
nucleoli
nucleosomes
chromatin
chromosomes
triplet code
3 bases=1 amino acid
isotonic cells
balanced water flow in and out of cell
hypotonic
gain waters could rupture
hypertonic
looses water, shrinks
facilitated diffusion is ___________
passive
what is vesicular transport m
materials move into or out of cell in vescicles endocytosis and exocytosis
what phase does a cell spend the majority of its life in?
interphase/undividing
somatic cells divide in three stages:
DNA replication
Mitosis
cytokenis-daughter cells