A
Cholesterol's role in the plasma membrane is best described as:
a. increasing permeability to water
b. preventing phospholipid tails from sticking together
c. anchoring proteins to the cytoskeleton
d. acting as a receptor for chemical signals
b. preventing phospholipid tails from sticking together
which organelle's malfunction would most likely impair protein packaging for secretion?
a. ribosome
b. golgi apparatus
c. mitochondria
d. lysosome
b. golgi apparatus
which principle of cell theory explains why cancer cells originate from existing body cells?
a. all living things are made of cells
b. cells are the basic unit of life
c. cells arise only from pre-existing cells
d. cells contain organelles for division
c. cells arise only from pre-existing cells
which feature distinguishes eukaryotic cells from prokaryotic cells?
a. plasma membrane
b. cytoplasm
c. membrane-bound organelles
d. presence of genetic material
c. membrane-bound organelles
why is the plasma membrane described as a "fluid mosaic"?
a. proteins are rigidly fixed
b. phospholipids move laterally
c. carbohydrates form a solid wall
d. cholesterol prevents movement
b. phospholipids move laterally
what happens to a plant cell in a hypotonic solution?
a. it shrivels
b. it bursts
c. it keeps its shape
d. it loses chlorophyll
a. it shrivels
The Na+/K+ pump moves ions against their gradient by:
a. Facilitated diffusion
b. Osmosis
c. Using ATP energy
d. Passive transport
c. using ATP energy
which process is used to secrete large particles like hormones out of the cell?
a. endocytosis
b. exocytosis
c. osmosis
d. facilitated diffusion
b. exocytosis
which protein waterproofs and protects skin cells?
a. melanin
b. collagen
c. keratin
d. elastin
c. keratin
why does acne occur?
a. excess keratin production
b. blocked sebaceous glands
c. UV damage to melanin
d. excess sweat secretion
b. blocked sebaceous glands
which marrow type produces blood cells?
red bone marrow
which cells form osteocytes during ossification?
osteoblasts
which cells break down old bone tissue?
osteoclasts
which structure is inflamed in bursitis?
fluid-filled sac OR bursae
the most essential mineral needed for bone formation is:
calcium
Which arthritis type results from cartilage deterioration?
osteoarthritis
why does a third-degree burn often cause no pain despite severe damage?
nerve cells are destroyed
which structure in compact bone contains blood vessels and nerves?
osteons
which type of skin cancer originates in melanocytes?
melanoma
which structure in the dermis produces oil that lubricates hair and skin?
sebaceous glands
the joint that allows side-to-side and back-and-forth movement in wrists, ankles and vertebrae
gliding
the joints found in the skull that are not movable
sutures
joint found in lower arm, neck, elbow with rotation as the main movement
pivot
joint found in the hips and shoulders with the widest range of motion
ball-and-socket
convex surface of one bone fits in the concave shape of the other, found in elbows and knees with a motion same to the door's
hinge