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final q& a part 2

front 1

The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction

back 1

loses electrons and loses potential energy.

front 2

Which of the following statements describes the results of this reaction?
C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

back 2

C₆H₁₂O₆ is oxidized and O₂ is reduced

front 3

When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes

back 3

oxidized.

front 4

The ATP made during glycolysis is generated by

back 4

substrate-level phosphorylation.

front 5

In cellular respiration, the energy for most ATP synthesis is supplied by

back 5

a proton gradient across a membrane ****

front 6

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?

back 6

energy released from movement of protons through ATP synthase, down the electrochemical gradient

front 7

Which metabolic pathway is common to both cellular respiration and fermentation?

back 7

glycolysis

front 8

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

back 8

ATP, CO₂, and ethanol (ethyl alcohol).

front 9

Which statement best supports the hypothesis that glycolysis is an ancient metabolic pathway that originated before the last universal common ancestor of life on Earth?

back 9

Glycolysis is widespread and is found in the domains Bacteria, Archaea, and Eukarya. ******************************************

front 10

Why is glycolysis considered to be one of the first metabolic pathways to have evolved?

back 10

It does not involve organelles or specialized structures, does not require oxygen, and is present in most organisms. *****************************************************

front 11

A mutation in yeast makes it unable to convert pyruvate to ethanol. How will this mutation affect these yeast cells?

back 11

The mutant yeast will be unable to grow anaerobically.

front 12

Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?

back 12

glycolysis

front 13

Most CO₂ from catabolism is released during

back 13

the citric acid cycle. **********************************************

front 14

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

back 14

ATP and NADPH

front 15

When oxygen is released as a result of photosynthesis, it is a direct by-product of
A) reducing NADP⁺.

back 15

splitting water molecules.

front 16

Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be

back 16

to test for liberation of O₂ in the light.

front 17

What does the chemiosmotic process in chloroplasts involve?

back 17

establishment of a proton gradient across the thylakoid membrane ***************************************************

front 18

In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

back 18

the stroma to the thylakoid space ***

front 19

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

back 19

Photosynthesis stores energy in complex organic molecules, whereas respiration releases it. **********************************************

front 20

In metabolic processes of cell respiration and photosynthesis, prosthetic groups such as heme and iron-sulfur complexes are encountered in components of the electron transport chain. What do they do?

back 20

both oxidize and reduce during electron transport

front 21

the centromere is a region in which

back 21

chromatids remain attached to one another until anaphase

front 22

why do chromosomes coil during mitosis

back 22

to allow the chromosomes to move without becoming entangled and breaking

front 23

which of the following best describes how chromosomes move toward the poles of the spindle during mitosis

back 23

the chromosomes are "reeled in" by the contraction of spindle microtubules and motor proteins

front 24

during which phase of mitosis do the chromatids become chromosomes

back 24

telophase

front 25

which of the following does not occur during mitosis

back 25

replication of the DNA

front 26

which of the following is true of a species that has a chromosome number of 2n = 16

back 26

each cell has eight homologous pairs

front 27

if a cell has completed the first meiotic division and is just beginning meiosis 2 which of the following is an appropriate description of its contents

back 27

it has half the amount of DNA as the cell that began meiosis.

front 28

chromatids are separated from each other

back 28

the statement is true for mitosis and meiosis II
******************************************

front 29

independent assortment of chromosomes occurs

back 29

the statement is true for meiosis 1 only

front 30

centromeres of sister chromatids disjoin and chromatids separate.

back 30

telophase II

front 31

independent assortment of chromosomes is a result of

back 31

the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I

front 32

which of the following statements is true of linkage?

back 32

the closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.

front 33

if nondisjunction occurs in meiosis II during gametogenesis, what will be the result at the completion of meiosis

back 33

1/4 of the gametes will be n + 1, 1/4 will be n - 1, and 1/2 will be n. ******************************

front 34

suppose that a gene on human chromosome 18 can be imprinted in a given pattern in a female parent but not in a male parent. a couple in whom each maternal meiosis is followed by imprinting of the gene have children. what can we expect as a likely outcome?

back 34

all the children will bear their mother's imprinting pattern but only daughters will then pass it down

front 35

which of the following statements is true about protein synthesis in prokaryotes?

back 35

translation can begin while transcription is still in progress.