Exam 3

Question 1

Describe the components that make up the cell membrane and what contributes
to its degree of fluidity

Answer 1

Phospholipid bilayer make up cell membrane( boundary between cell and external environment)

Unsaturated hydrogen tails prevent packing, enhancing membrane fluidity, saturated hydrogen tails pack together, increasing membrane viscosity.

Question 2

Compare and contrast photosynthesis with cellular respiration

Answer 2

ATP 30-32 ATP Yes
Sunlight not required Yes
Organic compound + Oxygen —> CO2 + water + energy, CO2 + water + energy —> organic compound + oxygen
Glycolysis, kerbs cycle, oxidative phosphorylation, Light reaction, Calvin Cycle
Catabolism, Anabolism
Products CO2, water, ATP Oxygen, water, glucose
Final electron receptor Oxygen, gas NADP+
Places Mitochondria, Glycolysis (cytoplasm)
Chlorplast

Question 3

Explain why a oxygen is essential to harvesting the most energy and why

Answer 3

Once the electrons are used, they become depleted and must be removed from the body. Oxygen is essential for this task. Used electrons bind with oxygen; these molecules eventually bind with hydrogen to form water.

Question 4

Roots:

Answer 4

Anchoring plant, absorbing minerals and water, storing carbohydrates.

Question 5

Stems:

Answer 5

Elongate - maximize photosynthesis, elevate reproductive structures- dispersal, food storage, Aesexual reproduction

Question 6

Leaves:

Answer 6

Photosynthesis - intercept light, gas exchange, dissipate heat, defense

Question 7

Dermal tissue

Answer 7

protection - damage, pathogens, water lose prevention

Question 8

Ground tissue:

Answer 8

is (pith, cortex), storage, photosynthesis, support, short distance transport

Question 9

Vascular tissue:

Answer 9

Multifunctional. Mechanical support, transport materials.

Question 10

Xylem

Answer 10

water and dissolved minerals from root to shoots

Question 11

Phloem

Answer 11

sugars from leaves to storage or growth sites

Question 12

Gases exchange and transport

Answer 12

the gas goes through leaves(main organ), for the process of photosynthesis, and released through the stomata (move in and out)

Question 13

Water

Answer 13

Short distance - Osmosis, turgor pressure(pressure maintained in a plant when it is health)
and plasmolysis(not enough water intact), Aquaporins(proteins for Osmosis, better but
necessarily)
Long distance - driven by pressure gradients, called bulk flow

Question 14

Sugar

Answer 14

active transport into sink, sources: photosynthesis or break down
sugar move to from source to sink

Question 15

Minerals

Answer 15

because the soil is negatively charged, it does not stick with other Anions, and
that allows these anions be taken up to the roots. However, Cations do attracted to the negatively charged soil and so for the plant to obtain cations, there has to be an exchange of a different negatively charged particles