1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
luda_lava [24]
3 years ago
9

A scientist is using a species of green algae to study the electron transport chain in photosynthesis. He uses a laser to inacti

vate all of chlorophyll A in the algae but leaves chlorophyll B intact (case 1). In a separate experiment, the scientist applies a chemical to the algae that inhibit PS I but do not affect PS II (case 2).
Which of the following results is expected?
A)in case 1, only PS I completely loses function; in case 2, no proton gradient is produced.
B)In case 1, only PS I completely loses function; in case 2, a proton gradient is still produced.
C)In case 1, both PS I and PS II completely lose function; in case 2, no proton gradient is produced.
D)In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.
Biology
1 answer:
jeka943 years ago
3 0

Answer:

D) In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.

Explanation:

The light dependent reaction of photosynthesis, which produces the ATP and NADPH needed in the light independent stage of the process, includes complexes of proteins and pigments called PHOTOSYSTEMS. These photosystems (I and II) are key to the functionality of the light dependent reactions in the thylakoid.

The major pigment present in both photosystems is CHLOROPHYLL A, which absorbs light energy and transfers electrons to the reaction center. Chlorophyll B is only an accessory pigment meaning it can be done without. Hence, if all of the chlorophyll A is inactivated in the algae but leaves chlorophyll B intact as in case 1, both PS I and PS II will lose their function because Chlorophyll A is the major pigment that absorbs light energy in both photosystems.

In case 2, if PS I is inhibited and PS II is unaffected, a PROTON GRADIENT WILL STILL BE PRODUCED because the splitting of water into protons (H+) and electrons (e-) occurs in PSII. Hence, H+ ions can still be pumped into the inner membrane of the thylakoid in order to build a proton gradient even without the occurrence of PS I.

You might be interested in
What are two ways a catalyst affect a chemical reaction
Maksim231197 [3]
1). it either lowers or increases the activation energy. 2). it modifies the rate of the reaction
5 0
3 years ago
Name two types of evidence used to support the theory of evolution. explain how scientist use each type of evidence to provide s
joja [24]

Answer:

There are many types of evidence which support the theory of evolution such as comparative anatomy, fossil records, phylogenetic relationship, embryology et cetera

Comparative anatomy includes homologous organs and analogous organs. They support divergent and convergent evolution respectively.  

For example, the homologous structure of limb of humans, birds, bat, horse, whale et cetera show that they are made up of the same set of bones which are humerus, radius, ulna, carpals, metacarpals, and phalanges.  

It shows divergent evolution and supports that these organisms have evolved from a common ancestor.

Embryological evidence: When early stages of embryological development of different organisms are compared, it is found that these stages are similar at different levels of development.

For example:

  • The appearance of pharyngeal-arch (gill-like structures) in vertebrates during embryo development.
  • Salamanders and terrestrial frogs pass through larval stages within an egg. They possess the features similar to aquatic larvae, however, when they hatched out the eggs being ready for life on land.
3 0
3 years ago
Read 2 more answers
The most easily polluted groundwater reservoirs are A. salt reservoirs. <br> B. sewage plant reservoirs. <br> C. water-table aqu
Luda [366]
Water-table aquifers, I believe! :)

6 0
3 years ago
Soil is best described as _______.
elena-14-01-66 [18.8K]

Answer:

Soil is composed of small pieces of a variety of materials, so it is a heterogeneous mixture.

Explanation:

6 0
2 years ago
WILL GIVE A BRAINLEST
ivolga24 [154]
They will run out. Because nonrenewable means it can't be renewed until like millions of year or so. Hope this helps and You're Welcome! :3
3 0
3 years ago
Read 2 more answers
Other questions:
  • Color blindness is an x-linked recessive trait. under what conditions can an unaffected male have a color-blind daughter? his ma
    10·1 answer
  • WILL MARK BRAINLIEST
    7·2 answers
  • What do the 4 beans represent
    11·2 answers
  • Despite the energy crisis in the 1970s, the United States has increased its dependence on coal energydecreased its dependence on
    14·2 answers
  • Which of the following is the healthiest type of carbohydrate
    15·1 answer
  • 100 POINTS..!!
    12·2 answers
  • Every one person has how many different types of genes
    14·1 answer
  • Which type of plant tissue contains open vessels that transport water, irons, materials and nutrients throughout a plant
    6·1 answer
  • True or false:<br><br> Fish are considered carbon-based organism
    13·1 answer
  • What is the missing word <br> cells ________ during development to perform different functions
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!