Bio Exam 2

Which
of the following best
describes the overall reaction in plants during photosynthesis,
including both light and dark phases?

A. H20 + C02
+
Energy
---) 02
+
Carbohydrate
B.
02
+ Carbohydrate ---) H20 + C02 + Energy
C. H20
+
Carbohydrate ---) 02
+ C02
+ Energy D. 02 +
Carbohydrate ---) H20 + Energy+ C02

E. 02 + H20 + Energy
---)
C02 + Carbohydrate

Most plants are
green because:

A. green
light is absorbed

B.
red and blue light
are reflected

C.
all wavelengths of light are absorbed
equally

D. all wavelengths of light are reflected equally

E. green light is reflected.

The enzyme responsible for fixing carbon in the Calvin cycle
is:
A. lactate dehydrogengenase

B. phosphofructokinase

C. RUBISCO

D. chlorophyll

During the light phase of photosynthesis electron
flow is best described by:

A. Photosystem II ---) Photosystem I ---) Water
---) NADPH
B. Water ---) Photosystem II ---) Photosystem I ---) NADPH
C. Photosystem I ---) Photosystem II ---) NADPH-) Water
D. Photosystem II ---) Photosystem I ---) NADPH---) Water

In
some plants the C4 or CAM' systems have evolved to avoid: A.
loss ofNADPH

B.
shortage of oxygen

C.
shortage of ATP

D.
shortage of glucose

E. shortage of C02

During the light phase of photosynthesis the flow of electrons along the electron transport chain is
used to:

A. produce glucose

B. produce C02

C. move protons (H+) across
a membrane to produce ATP D. produce NADP+

True or false: In the chloroplast during
photosynthesis chlorophyll uses captured light energy to excite electrons.

A. true

B. false

During what stage of the cell cycle does the duplication of chromosomes occur?

A. G1
B. G2
C. S
D. Mitosis

For a growing
human cell the cell cycle takes about:
A. 1 hour
B. 1 day
C. 1 week

The stage of Mitosis when the nuclear
membrane breaks down and chromosomes condense is:

A. Anaphase
B. Telophase
C. Metaphase
D. Interphase
E. Prophase

During cytokinesis the division of the cytoplasm
occurs.

A. true
B. false

The
major difference between
mitosis and meiosis
is:

·· A. during
meiosis 4 diploid daughter
cells are produced

B. during meiosis 4 haploid cells are produced

C. during
mitosis 4 haploid cells are produced

D.
during mitosis 4 diploid daughter
cells are produced

Homologous chromosomes or Homologs pair and recombine:

A. during the second meiotic
division

B. during mitosis

C. during
the first meiotic
division

.·.
D. during all phases of meiosis and mitosis

If Mendel crossed a smooth pea with a wrinkled pea and all the progeny
were smooth the most accurate interpretation would
be:

A. smooth
is dominant

B. smooth
is recessive

If Mendel crossed
a homozygous smooth pea with a homozygous wrinkled pea all the progeny would be expected
to be:

A. homozygous smooth
B. homozygous wrinkled
C. Heterozygous

True or false: The nucleus of a normal human cell contains 46 chromosomes.

A. true B. false

True or false: In humans XX individuals are usually male and XY individuals are usually female.

A. true
B. false

Assume that color is a Mendelian
genetic train in voles. A male gray vole is found.
When the gray male is mated with a gray female V.. of
the offspring are brown,% of the offspring are gray.

When the gray male is mated
with a brown female Yi of the offspring are brown, Yi are gray. What
do these matings tell us about the coat color genes?

A.
gray is dominant and the male is homozygous
B. gray is dominant and the male is heterozygous
C. gray is recessive and the male is homozygous
D. gray is recessive
and the male is heterozygous

If 2 carriers for a recessive
trait mate, what are the chances their child will show the trait?

A. 50%
B. 25%
C. 100%
D. 0%
E. 75%

Assume that a trait is recessive and sex-linked.
If the allele is distributed equally
throughout the

.
population
how would
we expect the trait to appear?

A. the trait will be appear more frequently in males

B. the
trait will be appear more frequently
in females

C. the trait will be appear with equal frequently in both males and females

The Griffith experiment that used mice and two strains ofbacteria (smooth and rough) to show transformation demonstrated:

A. heating
cells kills them by denaturing
(destroying) their DNA

B. heat which kills virulent
bacteria destroys DNA

C. heat which kills virulent bacteria
does not destroy DNA

D. heat which kills virulent
bacteria destroys protein

E. heat which kills virulent bacteria
does not destroy
protein

The most common
structure for DNA is the double helix, in this structure:

A. nucleotides are joined by covalent bonds involving phosphate forming a single strand and 2 strands are bound by H bonds
between purine and pyrimidine bases

B. nucleotides are joined by H bonds between
purine and pyrimidine bases

forming a single strand and 2 strands
are bound by covalent bonds involving phosphate

C. nucleotides
are joined by covalent
bonds involving purine
and pyrimidine forming
a single strand and 2 strands are bound by covalent bonds involving phosphate

.
D. nucleotides are
joined by covalent
bonds involving phosphate forming a single strand and

2 strands are bound by covalent bonds between purine
and pyrimidine bases

Given the following
sequence: 3'- GCATGT -5', which will base pair best with it?

A. 5'-CGTACA-3'

B. 5'-TACGTC-3'

C. 5'-GCATGT-3'

About how many nucleotide pairs does the human genome contain?

A. 3.4 thousand
B. 3.4 million
C. 3.4 billion
D. 3.4 hundred thousand

True or False: For
a gene that codes for a protein
three nucleotides of DNA serve as a template for three nucleotides in the mRNA and these will specify one amino acid in the protein.

A. True
B. False

The process of duplicating
the chromosomal DNA is called:

A. transcription

B. translation

C. replication

D. transformation

E. transduction

The process of producing
an RNA molecule from a DNA template
is called:

A. transcription

B. translation

C. replication

D. transformation

E. transduction

28. Assume
that mammalian cells are grown in culture
in the presence of
fluorescent nucleotides for several generations so that all of the DNA in all the chromosomes is fluorescent. When these cells
are examined under a microscope, all of the chromosomes in the nucleus
glow. If one of these cells is placed in regular media for one generation, what will
the chromosomes of the two daughter cells look like?

A. all the chromosomes in both daughters will glow

B. all the chromosomes in only one of the
daughters will glow, the other cell will not

C. only some of the chromosomes in both cells will glow

True or False:
During Translation the nucleotide sequence
in the messenger (mRNA) determines the order of the amino acids in
the protein. The transfer tRNA brings the amino acids to the ribosome.

A. True
B. False

True or False: The promoter
region in prokaryotes is a region of
DNA where the RNA polymerase binds to start transcription.

A. True
B. False

True or False: In eukaryotes transcription factors must bind at the promoter region before the polymerase will begin transcription.

A. True
B. False

True or False: changing the nucleotides sequence of the promoter region may prevent the gene from being transcribed.

A. True
B. False