Question 1 (1 point) Which part of the photosynthesis can occur in the absence o

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Question 1 (1 point)

Which part of the photosynthesis can occur in the absence of light?

Question 1 options:

carbon fixation and conversion to glucose

generation of ATP

electron transport

generation of NADPH

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Question 2 (1 point)

What would be the effect of loss of function of the water splitting enzyme in photosystem II and why?

Question 2 options:

no photosynthesis as oxygen created from water splitting is necessary

increase photosynthesis as water splitting is the rate limiting step.

no change in photsynthetic activity

no photosynthesis as electrons cannot be replaced in chlorphyll

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Question 3 (1 point)

Suppose you had a drug that blocked the protons from moving through ATP synthase. What would be the effect on the pH of the Thylakoid space relative to to a cell that had not been given the drug.

Question 3 options:

There would be no difference

Thylakoid space would be less acidic in the drugged cell

Thylakoid space would be more acidic in the drugged cell

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Question 4 (1 point)

Which enzyme did practically every carbon molecule in biological systems have to come in contact with at some point?

Question 4 options:

Rubisco

water splitting enzyme

ATP synthase

chlorophyll

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Question 5 (1 point)

Suppose the enzymes responsible for regenerating RuBP were defective. What would be the effect on the light reactions of photosynthesis and why?

Question 5 options:

the light reaction would stop due to lack of ATP

The light reactions would stop due to a lack of NADP+

The light reactions would stop as RuBP is part of the electron transport chain

The light reactions would continue as they are not connected to the Calvin cycle

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Question 6 (1 point)

In DNA are GC or AT base pairs stronger and why?

Question 6 options:

GC as they form 3 hydrogen bonds while AT forms 2

AT as they form 2 hydrogen bonds to GC pair's three

GC as guanine and cytosine are more stable molecules

AT because they are able to form covalent bonds

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Question 7 (1 point)

Lets assume a normal molecule of Pol III can copy 1,000,000 base pairs of DNA before falling off the DNA molecule. What would you expect of a mutant that can only copy 1000 bp before falling off

Question 7 options:

The mutant can only replicate chromosomes of 1000 bp or less

Pol 1 would have to be more active to remove extra RNA primers

The mutant would be unable to copy the lagging strand

The mutant would operate faster

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Question 8 (1 point)

Why are transcription and translation not linked in eukaryotes?

Question 8 options:

eukaryotic must fold outside of the nucleus

eukaryotic mRNAs must be exported from the nucleus

eukaryotic mRNAs are more difficult to translate

eukaryotes slow the process down for greater proofreading

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Question 9 (1 point)

What is typically the termination signal for transcription

Question 9 options:

A sequence of RNA that forms a hairpin

A sequence of RNA that codes for stop codon

RNA polymerase only works for a fixed length of DNA

The binding of termination proteins to the DNA

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Question 10 (1 point)

Suppose you wanted to extract all of the mRNA from a eukaryotic cell. How could you isolate only mRNA

Question 10 options:

Bind it to a primer with sequence AAAAAAAAAAAAAAAAA

Bind it to a primer with sequence ATGATGATGATGATG

Bind it to a primer with random DNA sequences

Bind it to a primer with multiple RNA stop sites

carbon fixation and conversion to glucose

generation of ATP

electron transport

generation of NADPH

Explanation / Answer

Answer:

1. (a) carbon fixation and conversion to glucose

Explanation:

Carbon fixation and Calvin cycle are reactions that do not require light.

2. (d) no photosynthesis as electrons cannot be replaced in chlorphyll

Explanation:

By replenishing lost electrons with electrons from the splitting of water, photosystem II provides the electrons for all of photosynthesis to occur. The hydrogen ions (protons) generated by the oxidation of water help to create a proton gradient that is used by ATP synthase to generate ATP. The energized electrons transferred to plastoquinone are ultimately used to reduce NADP+ to NADPH or are used in cyclic photophosphorylation.

3. (c) Thylakoid space would be more acidic in the drugged cell

Explanation:

In drugged cell, protons will not be able to come out from thylakoid space onto stromal space. So, thylakoid space will be more acidic.

4.(a) Rubisco

Explanation:

Rubisco is an enzyme involved in the first major step of carbon fixation, a process by which atmospheric carbon dioxide is converted by plants and other photosynthetic organisms to energy-rich molecules such as glucose. In chemical terms, it catalyzes the carboxylation of ribulose-1,5-bisphosphate (also known as RuBP). It is probably the most abundant enzyme on Earth.

(Since there are more than 1 question, the first 4 questions have been answered according to the rules of Chegg)

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