BIOL211- CH 11, 12, AND 13 TEXTBOOK REVIEW QUESTIONS

Practice Chapter 14 and 15 elsewhere.

Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of substances on opposite sides of the membrane?

Ligand-gated ion channel

The activation of receptor tyrosine kinases is characterized by…

Dimerization and Phosphorylation

Lipid-soluble signaling molecules, such as aldosterone, cross the membranes of all cells but affect only target cells because…

Intercellular receptors are present only in target cells

Consider this pathway: epinephrine —> G protein-coupled receptor —> G protein —> adenylyl cyclase —> cAMP. Identify the second messenger.

cAMP

Which of the following occurs during apoptosis?

Fragmentation of DNA

Protein phosphorylation is commonly involved with which of the following?

Activation of protein kinase molecules

Vinblastine is a drug used to treat cancer. It interferes with the assembly of microtubules, its effectiveness must be related to…

Disruption of mitotic spindle formation

One difference between cancer cells and normal cells is that cancer cells…

Continue to divide even when they are tightly packed together

The decline of MPF activity at the end of mitosis is due to…

The degradation of cyclin

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in…

Cells with more than one nucleus

Which of the following occurs during S-phase?

Replication of DNA

Cell A has half as much DNA as cells B, C, and D. Cell A is most likely in…

G1-phase

If a drug blocked the function of actin, which part of the animal cell cycle would be most disrupted?

Cleavage furrow formation and Cytokinesis

A human cell containing 22 autosomes and a Y chromosome is…

Sperm

The two homologs of a pair move towards opposite poles of the dividing cell during…

Meiosis I

Meiosis II is similar to Mitosis in that…

Sister chromatids separate during Anaphase