Missed Question - Ch. 3 Flashcards
Which of the following statements about the cell membrane in the bilayer model is incorrect?
A) The membrane forms a boundary around the cellular contents. B) The membrane allows some substances to enter and leave the cell but not others. C) The basic structure of the cell membrane is a lipid-protein bilayer. D) The interior of the cell membrane allows water soluble substances to pass through it.
D) The interior of the cell membrane allows water soluble substances to pass through
Explanation - the inside layer is not water soluble
Carbohydrate molecules bound to proteins on the surface of the cell membrane function in
A) controlling substances entry and exit from the cell B) providing a reservoir of energy for intracellular functions C) recognition of self versus non-self D) as hormone receptors
C) recognition of self versus non-self
Explanation: Glycoproteins are recognized by the immune system
Flattened sacs and elongated canals that may contain ribosomes are part of
A) endoplasmic reticulum B) Golgi apparatus C) mitochondria D) lysosomes
A) Endoplasmic Reticulum (ER)
Explanation - You should know this >:(
The organelle essential to reproduction is the
A) centrosome B) celium C) microtubule D) vesicle
A) Centrosome
Explanation - The centrosomes form the spindle fibers in division
Vesicles that have a role in secretion are formed by the
A) Golgi apparatus B) endoplasmic reticulum C) both D) neither
C) both
Explanation - the golgi apparatus and reticulum function in the secretion and transport
(When in doubt pick both. at least you’ll technically be half correct)
Thin, threadlike processes within the cytoplasm that function in various kinds of cell movement are
A) microfilaments and microtubules B) cilia and flagella C) both D) neither
A) Microfilaments and Microtubules
Explanation - come on. tube is literally in the name
The mechanism in which molecules or ions spread randomly from areas of higher concentration to areas of lower concentration is
A) filtration B) osmosis C) exocytosis D) diffusion
D) diffusion
Explanation - They’re distributing/ diffusing themselves.
Substances such as which of these can diffuse readily through the cell membrane?
A) oxygen B) carbon dioxide C) both D) neither
C) both
Explanation - Oxygen and carbon dioxide are small enough to diffuse across membranes
Molecules that are too large to pass through the membrane pores, such as glucose, and are insoluble in lipids enter the cell using
A) active transport B) filtration C) endocytosis D) facilitated transport
D) facilitated transport
Explanation - Facilitated transport uses a carrier molecule to transport molecules such as glucose into a cell
When fluid is forced through a membrane by hydrostatic or blood pressure, the mechanism is called
A) filtration B) facilitated diffusion C) controlled by electrically gated channels D) hormone mediated
A) filtration
Explanation - you filter fluid through the membrane
Processes that require energy to move substances into and out of the cell without crossing through the cell membrane include
A) endocytosis B) pinocytosis C) phagocytosis D) all of the above
D) all of the above
Explanation - All of these are processes of membrane changes that engulf particles; all of these require ATP energy
The phase of the cell cycle in which cell contents grow and duplicate is
A) interphase B) metaphase C) prophase D) telophase
A) interphase
Chromosomes first appear during
A) prophase B) metaphase C) anaphase D) telophase
A) Prophase
Nutrients are received, processed, and used in the cytoplasm of the cell.
A) True B) False
A) True
Flagella are found on the free surfaces of epithelial cells; cilia are longer, more abundant, and move cells within the body.
A) True B) False
B) False
