Cell Biology Answers

Explain how muscles contract - making reference to: Sliding filament theory, Z bands, Actin and Myosin.

Compare and contrast diffusion, osmosis, facilitated diffusion and active transport. In other words, what are the similarities AND differences between the different means of crossing a membrane. Be sure to discuss concentration gradient, use of proteins, what is crossing the membrane, and energy requirements.

what is chromatin

The diploid cells of a moose (Alces alces) contain 54 chromosomes. A non-disjunction in meiosis I of a moose germ cell would form how much chromosomes

Choose one out of paracrine signalling, endocrine signalling, autocrine signalling and direct signalling and describe briefly the process by which this occurs.

Pick a representative signal molecule from the pathway you have chosen and indicate its function, the type of cell in which it is made and the specific manner in which it acts as a signalling molecule, including the receptor that it binds to.

In terms of osmosis and tonicity, what happens to the solute concentration in solutions surrounding the cells when you eat salty foods, and how does that affect your cells?

Which of the following is not the importance of the homeostasis mechanism in a human?

A. To control the exchange of gases through the respiration system

B. To control the waste content

C. To control the balance of the blood osmotic pressure

D. To regulate the body temperature at the normal level

Which of the following is not the importance of the homeostasis mechanism in a human?

A. To control the exchange of gases through the respiration system

B. To control the waste content

C. To control the balance of the blood osmotic pressure

D. To regulate the body temperature at the normal level

Litego school of biology student used a microscope with ×40 objective lens and ×15 eye piece lens which had a 2mm radius. Calculate the area of the field of view in micrometers

Explain how phospholipids and steroids differ in structure from fats. Make sure you discuss all 3 lipids.