Need help with these two: PLEASE help me; this is like the 4th time I'm posting this.
26. Why do plant cells contain both choroplasts and mitochondria?
a. in the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs.
b. if plants can't produce enough ATP to make sugars during photosynthesis, they can produce it during cellular respiration
c. Sugars are produced in chloroplasts during photosynthesis. These sugars can be stored in the plan for later use during cellular respiration
d. The leaves, and sometimes, the stems of plants contain chloroplasts while the roots of plants contain mitochondria.
27. Which of the following is true for both aerobic and anaerobic respiration?
a. ATP is produced during glycolysis
b. Pyruvate is broken down to ethanol or lactate
c. the electron transport chain pumps hydrogen ions across a membrane
d. An organic hydrogen acceptor recycles NAD+
Thanks
-MC
Unfortunately, none of the regular tutors here is a biologist.
I suggest you Google these questions.
Can't bobpursley answer it?
-MC
26.
A. Ridiculous, look up those definitions
B. Ridiculous. What happens in cellular respiration.
D. Nonsense, an answer for the boys to pick.
You really ought to know the vocab words in those answers.
27.(Broken Link Removed)
Hint:
b. Not in oxygen conditions
c. Isn't Oxygen the receptor in this ETC?
d. Reread the flow if NAD+ in the ETC
26. To answer this question, we need to understand the roles of chloroplasts and mitochondria in plant cells.
a. In the light, plants undergo photosynthesis, where they use chloroplasts to convert sunlight into energy-rich molecules like sugars. This process allows plants to produce their own food and make them photosynthetic autotrophs.
b. However, in the dark or when there is insufficient light for photosynthesis, plants switch to cellular respiration. During cellular respiration, mitochondria break down sugars and release stored energy in the form of ATP (adenosine triphosphate). This ATP can be used by the plant for various cellular processes.
c. Chloroplasts in plant cells are responsible for producing sugars during photosynthesis. These sugars can be stored in the plant for later use during cellular respiration. When photosynthesis is not occurring or there is a higher energy demand, plants can use these stored sugars for ATP production in the mitochondria.
d. The distribution of chloroplasts and mitochondria in plant cells is not limited to specific regions like leaves, stems, or roots. While chloroplasts are primarily found in leaves, mitochondria are present in different parts of the plant, including leaves, stems, and roots. Both organelles are necessary for the overall functioning of the plant in different metabolic processes.
So, the correct answer to this question would be c. Sugars are produced in chloroplasts during photosynthesis. These sugars can be stored in the plant for later use during cellular respiration.
27. To determine the true statement for both aerobic and anaerobic respiration, let's examine the options:
a. ATP is produced during glycolysis: This statement is true for both aerobic and anaerobic respiration. Glycolysis is the initial step of both processes and results in the production of ATP.
b. Pyruvate is broken down to ethanol or lactate: This statement is true only for anaerobic respiration. In the absence of oxygen, some organisms, like certain bacteria or yeast, undergo fermentation, where pyruvate is broken down into ethanol or lactate.
c. The electron transport chain pumps hydrogen ions across a membrane: This statement is true for aerobic respiration. During the electron transport chain, hydrogen ions are pumped across the inner mitochondrial membrane, creating a gradient that ultimately contributes to ATP synthesis.
d. An organic hydrogen acceptor recycles NAD+: This statement is true for both aerobic and anaerobic respiration. In cellular respiration, NAD+ (nicotinamide adenine dinucleotide) is involved in accepting and transferring electrons. It is recycled back to its active form through the donation of hydrogen to an organic molecule.
Therefore, the correct answer to this question is a. ATP is produced during glycolysis.