Human Biology

Cecie Starr, Beverly McMillan

Chapter 3

Cells and How They Work - all with Video Answers

Educators

Chapter Questions

Problem 1

The plasma membrane _______
a. surrounds the cytoplasm
b. separates the nucleus from the cytoplasm
c. separates the cell interior from the environment
d. both a and C

Rabia Shuaib

Rabia Shuaib

Numerade Educator

Problem 2

The _____ is responsible for a eukaryotic cell's shape, internal organization, and cell movement.

Rabia Shuaib

Numerade Educator

Problem 3

Cell membranes sonsist mainly of _______
a. carbohydrate bilayer and proteins
b. protein bilayer and phospholipids
c. phospholipid bilayer and proteins

Rabia Shuaib

Numerade Educator

Problem 4

________ carry out most membrane functions.
a. Proteins
b. Phospholipids
c. Nucleic acids
d. Hormones

Rabia Shuaib

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Problem 5

The passive movement of a solute through a membrane protein down its concentration gradient is an example of ______
a. osmosis
b. active transport
c. endocytosis
d. diffusion

Rabia Shuaib

Numerade Educator

Problem 6

Match each organelle with its correct function.
$$ \text {protein synthesis} \quad \quad\quad\quad\quad \text {a. mitochondrion} $$
$$ \text {movement} \quad \quad\quad\quad\quad \text {b. ribosome} $$
$$ \text {intracellular digestion} \quad \quad\quad\quad\quad \text {c. smooth ER} $$
$$ \text {modification of proteins} \quad \quad\quad\quad\quad \text {d. rough ER } $$
$$ \text { lipid synthesis} \quad \quad\quad\quad\quad \text {e. nucleolus } $$
$$ \text {ATP formation } \quad \quad\quad\quad\quad \text {f. lysosome} $$
$$ \text {ribosome assembly} \quad \quad\quad\quad\quad \text {g. flagellum} $$

Rabia Shuaib

Numerade Educator

Problem 7

Which of the following statements is not true? Metabolic pathways ________
a. occur in a stepwise series of chemical reactions
b. are speeded up by enzymes
c. may break down or assemble molecules
d. always produce energy (such as ATP)

Danielle Ashley

Danielle Ashley

Numerade Educator

Problem 8

Enzymes _______
a. enhance reaction rates
b. are affected by $\mathrm{pH}$
c. act on specific substrates
d. all of the above

Rabia Shuaib

Numerade Educator

Problem 9

Match each substance with its correct description.
$$ \text {a coenzyme or metal ion} \quad \quad\quad\quad\quad \text {a. reactant} $$
$$ \text {formed at end of a metabolic pathway} \quad \quad\quad\quad\quad \text {b. enzyme} $$
$$ \text {mainly ATP} \quad \quad\quad\quad\quad \text {c. cofactor} $$
$$ \text {enters a reaction} \quad \quad\quad\quad\quad \text {d. energy carrier} $$
$$ \text {catalytic protein} \quad \quad\quad\quad\quad \text {e. product} $$

Danielle Ashley

Danielle Ashley

Numerade Educator

Problem 10

Cellular respiration is completed in the ______
a. nucleus
b. mitochondrion
c. plasma membrane
d. cytoplasm

Rabia Shuaib

Numerade Educator

Problem 11

Match each type of metabolic reaction with its function.
$$ \text {glycolysis} \quad \quad\quad\quad\quad \text {a. many ATP, NADH, $\mathrm{FADH}_{2},$ and $\mathrm{CO}_{2}$ form} $$
$$ \text {Krebs cycle} \quad \quad\quad\quad\quad \text {b. glucose to two pyruvate molecules and some ATP} $$
$$ \text {electron transport} \quad \quad\quad\quad\quad \text {c. $\mathrm{H}^{+}$ flows through channel proteins, ATP forms } $$

Rabia Shuaib

Numerade Educator

Problem 12

In a mitochondrion, where are the electron transport systems and enzymes required for ATP formation located?

Rabia Shuaib

Numerade Educator