Biology T3

The correct sequence of events in the cell-signaling process is

Which of the following is a correct association?

Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?

Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because

Where does the Calvin cycle of photosynthesis take place?

Inside an active mitochondrion, most electrons follow which pathway?

The difference between pinocytosis and receptor-mediated endocytosis is that

Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because

All of the following statements about glycolysis are true except

A distinctive feature of the mechanism of action of thyroid hormones and steroid hormones is that

Growth factors are local regulators that

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

A redox reaction involves the transfer of a(n)

In green plants, the primary function of the Calvin cycle is to

A protein that spans the phospholipid bilayer one or more times is

At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?

What is the primary function of the light reactions of photosynthesis?

What is the voltage across a membrane called?

The cotransport protein that allows two different substances to pass through a membrane in the same direction is

You are working on a team that is designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule selectively enters the target cells?

Which of the following statements correctly describes the normal tonicity conditions for typical animal cells?

How many moles of ATP are produced from the complete oxidation of a mole of glucose in cellular respiration?

Which process in eukaryotic cells will normally proceed whether O2 is present or absent?

Ions diffuse across membranes down their

Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells?

Where is ATP synthase located in the mitochondrion?

Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater?

Which of the following membrane activities requires energy from ATP hydrolysis?

Pyruvate is formed

Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?

Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

What kinds of molecules pass through a cell membrane most easily?

Which of the following is true of transcription factors?

Which of the following types of molecules are the major structural components of the cell membrane?

The oxygen consumed during cellular respiration is directly involved in

A concentration gradient is a form of

All of the following are functions of the Krebs cycle except

In what way do the membranes of a eukaryotic cell vary?

Consider this pathway: epinephrine → G-protein-linked receptor → G protein → adenylyl cyclase → cAMP. Identify the "second messenger."

During aerobic cellular respiration, a proton gradient in mitochondria will be generated by ________ and used primarily for ________ .

According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?