Test 3

Question 1

Fermentation:

Answer 1

Does not require O2

Question 2

Regardless of the electron or hydrogen acceptor employed, fermentation always produces:

Answer 2

NAD+

Question 3

When a photon is absorbed by a molecule, the photon:

Answer 3

raises the molecule from a ground state of low energy to an excited state.

Question 4

Accessory pigments:

Answer 4

allow photosynthetic organisms to absorb visible light of intermediate wavelengths

Question 5

The O2 produced during photosynthesis is derived from:

Answer 5

water

Question 6

In both photosynthesis and respiration, protons are pumped across a membrane during:

Answer 6

electron transport

Question 7

How is the Calvin cycle connected to the light reactions?

Answer 7

The Calvin cycle needs ATP and NADPH produced in the light reactions

Question 8

A haploid is a cell:

Answer 8

containing only one copy of each chromosome.

Question 9

The process of programmed cell death is called:

Answer 9

apoptosis

Question 10

Which of the following statements regarding tumor suppressor drugs and drugs developed to treat cancers resulting from oncogenes is true?

Answer 10

Tumor suppressors need to be reactivated, whereas oncogenes need to be switched off.

Question 11

One difference between mitosis and meiosis I is that:

Answer 11

homologous chromosome pairs synapse during meiosis but not during mitosis.

Question 12

Which of the following statements about homologous chromosome pairs is false?

Answer 12

They usually contain slightly different versions of the same genetic information.

Question 13

A diploid human cell normally has 23 pairs of homologous chromosomes, but as a woman ages, the chances of nondisjunction increase. Imagine that a gamete is produced in which the two homologous chromosome 21 have failed to separate. If that gamete is fertilized with a normal sperm, the embryo’s cells will contain _ chromosomes.

Answer 13

47

Question 14

The number of chromosomes is reduced to half during:

Answer 14

Meiosis I only

Question 15

All zygotes are:

Answer 15

Diploid

Question 16

Asexual reproduction produces genetically identical individuals because:

Answer 16

no meiosis or fertilization takes place

Question 17

Replication of DNA:

Answer 17

S phases

Question 18

Includes the G1 and G2 phase:

Answer 18

Interphases

Question 19

Occurs right after cytokinesis:

Answer 19

G1 phase

Question 20

The initiation of S phase of the cell cycle( or movement to the next phase at any time) depends on a pair of molecules called _ and _?

Answer 20

• CDK

- Cyclin

Question 21

How does a nucleus in G2 differ from a nucleus in G1?

Answer 21

The G2 nucleus has twice the amount of DNA as the G1 nucleus

Question 22

If two strains of true-breeding plants that have different alleles for a certain character are crossed, their offspring are called:

Answer 22

the F1 generation

Question 23

What are the expected genotype and Phenotype ratios for the F2 generation in a monohybrid cross?

Answer 23

1:2:1 and 3:1 respectively

Question 24

If a trait that is not expressed in the F1 generation, the inheritance of the trait in question is an example of:

Answer 24

dominance and recessiveness

Question 25

Which statement about an individual that is homozygous for an allele is FALSE?

Answer 25

Its parents were necessarily homozygous for that allele

Question 26

A pea plant with purple flowers is test crossed, and one-half of the resulting offspring has purple flowers, while the other half has white flowers. Therefore, the genotype of the test-crossed parent was:

Answer 26

Pp

Question 27

In mice, short hair is dominant to long hair. If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that:

Answer 27

the short-haired parent is heterozygous

Question 28

Classical albinism (lack of any pigment in the organism) results from a recessive allele. Which of the following is the expected ratio for the offspring when a normally pigmented male with an albino father has children with an albino woman?

Answer 28

1/2 normal pigmentation, 1/2 albino pigmentation