Questions and answers for exam Preparation

MCQs

Total Questions : 121 | Page 3 of 13 pages

Question 21. Which of the following is a second messenger?

lnositol 1,4,5-triphosphate
Diacyl glycerol
Phospholipase C
Both (a) and (b)

Discuss Question

Answer: Option D. -> Both (a) and (b)
Answer: (d).Both (a) and (b)

Question 22. Two key organizing principles for large multicellular organisms are

prokaryotic cell structure and cell specialization
cell specialization and communication between cells
communication between cells and simple nerve reflexes
simple nerve reflexes and cell specialization

Discuss Question

Answer: Option B. -> cell specialization and communication between cells
Answer: (b).cell specialization and communication between cells

Question 23. Which of the following is a hormone whose action requires a cell surface receptor?

Nitric oxide
Progesterone
Adrenaline
Growth factors

Discuss Question

Answer: Option C. -> Adrenaline
Answer: (c).Adrenaline

Question 24. Which of the following statement is incorrect?

The principal lipophilic hormones that binds to receptors located in the plasma membranes are prostaglandins
Prostaglandins are synthesized from arachidonic acid
Prostaglandins act as paracrine signaling molecules
None of the above

Discuss Question

Answer: Option D. -> None of the above
Answer: (d).None of the above

Question 25. The hormone or ligand can be considered as

first messenger
second messenger
both (a) and (b)
none of these

Discuss Question

Answer: Option A. -> first messenger
Answer: (a).first messenger

Question 26. According to the fluid mosaic model of cell membranes,

the most common type of molecules in the membrane are proteins
basic membrane structure results from how the proteins interact with water
the membrane is a highly mobile mixture of phospholipids and proteins
the unique properties of cell types are determined by their phospholipids

Discuss Question

Answer: Option C. -> the membrane is a highly mobile mixture of phospholipids and proteins
Answer: (c).the membrane is a highly mobile mixture of phospholipids and proteins

Question 27. The simplest way to differentiate a prokaryotic cell from a eukaryotic one is to

look for a plasma membrane
see if a nucleus is present
check for the presence of DNA
determine if the cell is an entire organism or not

Discuss Question

Answer: Option B. -> see if a nucleus is present
Answer: (b).see if a nucleus is present

Question 28. The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts

increase the surface area where key chemical processes can occur
help the cell against physical damage
make it possible to package large amounts of DNA within the cell
assist with cell movement

Discuss Question

Answer: Option A. -> increase the surface area where key chemical processes can occur
Answer: (a).increase the surface area where key chemical processes can occur

Question 29. Which of the following is the best criterion for deciding whether a cell is prokaryotic or eukaryotic?

The cell came from a single-celled or multicelled organism
The cell has a nucleus or not
The cell has cytosol or not
DNA is present in the cell or not

Discuss Question

Answer: Option B. -> The cell has a nucleus or not
Answer: (b).The cell has a nucleus or not

Question 30. Lysosomes are specialized vesicles in __________ that contain digestive enzymes for the breakdown of food. A related organalle known as a vacuole, which is found in __________ , also contains enzymes but in addition may act as a storage organelle for nutrients or water.