Biological Molecules
Plants store most of their energy for later use as
starch
Which of the following is / are not found in a prokaryotic cell?
a. ribosomes
b. plasma memrabne
c. mitochondria
d. a and c
c. mitochondria
The step in which the centromeres of all the chromosomes are lined up in the middle of the cell
Facilitated diffusion of ions across a cellular membrane requires ____,and the ions move _____.
channel proteins; down their concentration gradient
What phase of the cell cycle does DNA replication
S phase
peptide bond
The pores of the nuclear envolope provide for the movment of
a. proteins into the nucleus
b. ribosomal subunits out of the nucleus
c. mRNA out of the nucleus
d. all of the above
d. all of the above
The last step in mitosis when the two daughter cells split
cytokinesis
An animal cell placed in a hypotonic solution will
burst (lyse)
The longest part of the cell cycle is
a. prophase
b. G1 phase
c. mitosis
d. interphase
d. interphase
How are nuceotide monomers connected to form a polynucleotide?
a. by covalent bonds between the sugar of one nucleotide and the phosphate of the next
b. by hydrolysis, the removal of a water molecule and formation of a covalent bond between monomers
c. by hydrogen bonds between comlementary nitrogenous base pairs
d. by ester linkages between the carboxyl group od one of nucleotide and the hydroxyl group on the ribose of the next
a. by covalent bonds between the sugar of one nucleotide and the phosphate of the next
Microtubules are components of or associated with all of the following except
a. centrioles.
b. amoeboid movement.
c. tracks along which organelles can move using motor proteins.
d. flagella and cilia.
b. amoeboid movement.
What is the result of mitosis
two identical daughter cells
The fluidity of membranes in a plant in cold weather may be maintained by increasing the
a. proportion of peripheral proteins.
b. concentration of cholesterol in the membrane.
c. number of phospholipids with unsaturated tails.
d. number of phospholipids iwth saturated tails.
c. number of phospholipids with unsaturated tails.
A plant cell has 12 chromosomes at the end of mitosis. How many chromatids would it have in the G2 phase of the cell cycle?
24