Gen. Biology Test 2

25

A new form of life is discovered. It has a gentic code much like that of organisms on Earth except that there are five different DNA bases instead of four and the base sequences are translated as doublets instead of triplets. How many different amino acids could be accomodated by this gentic code?

UCA

A particular triplet of bases in the coding sequence of DNA is AGT. The corresponding codon for the mRNA transcribed is

Carbon dioxide is incorporated into PGA

All of the events listed below occur in the energy-capturing light reactions of photosynthesis except

DNA

All of the following are directly involved in translation except...

Production of identical daughter cells

All of the following are functions of meiosis in plants except

Adding electrons and protons to oxygen to form water

All of the following are functions of the Krebs cycle except

The mitituc spindles in prokaryotic cells are composed of microtubules

All of the following statements are true except

the synthesis of ATP

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer seperated from the stroma. This damage will have the most direct effect on which of the following process

Fix CO2 into organis acids during the night

CAM plants can keep stomates closed in daytime, thus reducing loss of water. They can do this because they

Acetic acid or acetyl CoA

Catabolism of proteins, lipids, and carbs can result in a 2-carbon molecule that enters the Krebs cycle. What is the molecule?

Molecular oxygen

During Oxidative phosphorylation, H2O is formed. Where do the oxygen atoms in the H2O come from?

Chain terminator codons occur

During translation, chain elongation continues until what happens?

6

Each time a molecule of glucose is completely oxidized via aerobic respiration, how many oxygen (O2) molecules are required?

phenylalanine

If the triplet UUU codes for the amino acid phenylalanine in bacteria, then in plants UUU should code for

zygotes

In animals, meiosis results in gametes, and fertilization results in

Construct simple sugars from carbon dioxide

In green plants, the primary function of Calvin Cycle is to

To harvest photons and transfer light energy to the reaction-center chlorophyll

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

Krebs cycle > NADH+H > electron transport chain > oxygen

Inside an active mitochondrion, most electrons follow which pathway?

Lactate/NAD

Muscle cells in oxygen deprivation convert pyruvate to ________ and in this step gain _______.

excision of introns

Once transcribed, eukaryotic mRNA typically undergoes substantail alteration that includes

Contains ribose as its sugar and uracil instead of thymine

RNA differs from DNA in that RNA

substrate-level phosphorylation

The ATP made during fermentation is generated by which of the following?

green

The color of light LEAST effective in driving photosynthesis is

accepting electrons at the end of the electron transport chain

The oxygen consumed during cellular resperation is directly involved in

This pigment is best at absorbing light with a wavelength of 70 nm

The reaction-center chlorophyll of photosystems I is known as P700 because

Exons

What are the coding segments of a stretch of eukaryotic DNA called?

mRNA

What is the transcript of eukaryotic genes which is exported from the nucleus?

An agent that closely mimics the structure of glucose but is not metabolized

What kind of metabolic poison would most directly interfere with glycolysis?

stroma of the chloroplast

Where does the Calvin cycle of photosynthesis take place?

ATP and NADPH+H

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calivin cycle?

Photosynthesis stores energy in complex organic molecules, while resperation releases it

Which of the following statements best describes the relationship between photosynthesis and respiration

The light reactions provide ATP and NADPH+H to the Calvin Cycle, and the cycle returns ADP, Pj, and NADP to the light reactions

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

The P680 chloropyll donates a pair of protons to NADPH+H, which is thus converted to NADP

Which of the following statements regarding events in the functioning of photosystem II is false?

They use PEP carboxylase to initally fix C3 plant

Why are C4 plants able to photosynthesize more efficently than a C3 plant?

Karyotype

a display of homologous chromosomes of a cell organized in relation to their number, size and type