If a plant cell is stripped of its cell wall it forms a protoplast. A protoplast would _____
A. be connected to adjacent protoplasts by a middle lamella.
B. be surrounded by cellulose.
C. be less rigid than a plant cell.
D. be stronger than a plant cell.
C. be less rigid than a plant cell.
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Why do plants use cotransporters instead of ion channels to transfer anions into cells?
A) Cotransporters are able to transfer anions against the membrane potential gradient, but ion channels cannot. B) Cotransporters can transfer ions across cell membranes, but ion channels cannot transport ions across cell membranes. C) Cotransporters are able to transfer anions against the proton gradient, but ion channels cannot. D) Anions are too bulky to be transported by ion channels.
The first organism ever cloned by researchers was Dolly the sheep in 1997
Indicate whether the statement is true or false
Which of the following RNA virus families include the smallest viral pathogens in animals?
A) Picornaviridae B) Coronaviridae C) Paramyxoviridae D) Arenaviridae E) Rhinoviridae
Which uses synthetic DNA plus DNA cloning techniques to introduce nucleotide changes at specific sites?
a. artificial chromosome synthesis b. ligation c. oligonucleotide replacement d. site-directed mutagenesis