When the size of a cell increases, the surface area/volume ratio
A) decreases initially and then begins to increase.
B) remains the same.
C) decreases.
D) increases initially and then begins to decrease.
E) increases.
C) decreases.
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The figure above represents the dynamics of _____
A) metapopulations B) extinction C) emigration D) both metapopulations and extinction E) both extinction and emigration
The programmed death and destruction of a cell is called ___________.
Fill in the blank(s) with the appropriate word(s).
Which structure is the major transport system for sperm?
a. testes b. epididymis c. vas deferens d. seminal vesicle e. prostate gland
A group of membrane proteins can be extracted from membranes only by using detergents
All the proteins in this group have a similar amino acid sequence at their C-terminus: -KKKKKXXC (where K stands for lysine, X stands for any amino acid, and C stands for cysteine). This sequence is essential for their attachment to the membrane. What is the most likely way in which the C-terminal sequence attaches these proteins to the membrane? (a) The cysteine residue is covalently attached to a membrane lipid. (b) The peptide spans the membrane as an ? helix. (c) The peptide spans the membrane as part of a ? sheet. (d) The positively charged lysine residues interact with an acidic integral membrane protein.