Biology Final

Front 1

What is the role of oxygen in cellular respiration?

Back 1

it is the final electron acceptor for the electron transport chain.

Front 2

When the poision cyanide blocks the electron transport chain, glycolysis and the citric acid cycle soon grind to a halt. Why do they stop?

Back 2

They run out of NAD+ and FAD.

Front 3

A biochemist wants to study how various substances were used in cellular respiration. In one experiment, he allowed a mouse to breath air containing O2 "labeled" by a particular isotope of oxygen. In the mouse, the labeled oxygen atoms first showed up in

Back 3

NADPH

Front 4

In glycolisys_____ is oxidized and_____is reduced.

Back 4

glucose....NAD+

Front 5

Which of the following is the most immediate source of energy for making most of the ATP in your cells?

Back 5

The diffusion of hyhydrogen ions across a membrane.

Front 6

Which of the following conversions represents a reduction reaction?

Back 6

pyruvate-------->lactate

Front 7

Photosynthesis consumes___and produces__.

Back 7

CO2.....chlorophyll

Front 8

Which of the following are prodcued by reactions that take place in the thylakoids and consumed by reactions in the stroma?

Back 8

ATP and NADPH

Front 9

In photosynthesis,____is oxidzed and____is reduced.

Back 9

water.....carbon dioxide

Front 10

Why is it difficult for most plants to carry out photosynthesis in very hot, dry environments?

Back 10

The closing of stroma keeps CO2 from entering and O2 from leaving the plant.

Front 11

When light strikes chorophyll molecules, they lose electrons, which are ultimately replaced by___.

Back 11

splitting water

Front 12

What is the role of NADP+ in photosynthesis?

Back 12

It carries electrons to the calvin cycle.

Front 13

The reactions of the calvin cycle are not directly dependent on light, but they usually do not occur at night. why?

Back 13

the calvin cycle depends on products of the light reactions.

Front 14

How many turns of the calvin cycle are required to produce one molecule of glucose?

Back 14

6

Front 15

If an intestinal cell in a grasshopper contains 24 chromosomes, a grasshopper sperm cell contains____chromosomes.

Back 15

12

Front 16

Which of the following phases of mitosis is esentially the opposite of prophase in terms of nuclear changes?

Back 16

telophase

Front 17

A biochemist measured the amount of DNA in cells growing in the labratory and found that the quantity of DNA in a cell doubled.

Back 17

between the g1 and g2 phases of the cell cycle.

Front 18

Which of the following is not a function of mitosis in humans?

Back 18

production of gametes from diploid cells.

Front 19

A micrograph of a dividing cell from a mouse showed 19 chromosomes, each consisting of two sister chromatids. During which of the following stages of cell division could this picture have been taken?

Back 19

prophase II of miosis.

Front 20

Cytochalasin B is a chemical that disrupts imcrofilament formation. This chemical would interfere with

Back 20

cleavage

Front 21

It is difficult to observe individual chromosome during interphase because

Back 21

They are in the form of long, thin strands.

Front 22

A fruit fly somatic cell contains 8 chromosomes. This means that ___ different combinations of chromosomes are possible in gametes.

Back 22

16

Front 23

If a fragment of a chromsome breaks off and then reataches to the original chromsome but in reverse direction, the resulting chromosmal abnormality is called

Back 23

a nondisjuntion

Front 24

Why are the indiviuals with an extra chromosome 21, which causes down syndrome, more numeros than individuals with an extra chromosome 3?

Back 24

Nondisjuntional of chromosome 21 probably occurs more frequently.

Front 25

Edward was found to be heterozygous for sickle cell trait. The alleles represenyed by the letter S and s are

Back 25

on homologous chromosomes.

Front 26

Whether and allele is dominant or recessive depends on

Back 26

whether or not it is linked to another gene

Front 27

Two fruit flies with eyes ed color are crossed, and their offsprings are as follows: 77 red-eyed male, 71 ruby eyed male, 152 red-eyed females. the allele for ruby eyes is

Back 27

sex-linked and recessive

Front 28

In some of his experiments, Mendel studied the inheritance pattern of two characteristics at once---flower color and pod color, for example. He did this to find out

Back 28

whether genes for two characteristics ae inheited seperately or together.

Front 29

A man who has type B blood and a woman who has type A blood could have children of whoch of the following phenotypes?

Back 29

A, B, AB or O

Front 30

Scientists have discovered how to put together a bacteriophage with a protein coat of the phage T2 and the DNA of phage lambda. If this composite phage were allowed to infect bacterium, the phages produced in the host cell would have

Back 30

the protein and DNA of lambda

Front 31

A geneticist found that a particular mutation had no effect on the polypeptide coded by a gene. This mutation probably involved

Back 31

substitution of nucleotide

Front 32

Which pf the following corectly rankes the structures in order of size from largest to smallest?

Back 32

chromsome---gene---codon----nucleotide

Front 33

The nucleotide sequence of a DNA codon is GTA. A messenger RNA molecule with a complementary codon is trancsribed from the DNA. In the process of protein synthesis, a transfer RNA pairs with the mRNA codon. What is the nucleotide sequence of the tRNA anticodon?

Back 33

GUA

Front 34

Ancient cyanobacteria, found in fossil stromatolites, were very important on the of life because

Back 34

produced the oxygen in the atmopshere

Front 35

You set your time for three billion years ago and push the start button. When the dust clears you look out the window. Which of the following describes what you would porbably see?

Back 35

A cloud of gas and dust in space

Front 36

In terms of nutrition, autotrophs are to heterotrophs as

Back 36

pathogenic bacteria are to harmless bacteria