Test 3 Flashcards
Fermentation:
Does not require O2
Regardless of the electron or hydrogen acceptor employed, fermentation always produces:
NAD+
When a photon is absorbed by a molecule, the photon:
raises the molecule from a ground state of low energy to an excited state.
Accessory pigments:
allow photosynthetic organisms to absorb visible light of intermediate wavelengths
The O2 produced during photosynthesis is derived from:
water
In both photosynthesis and respiration, protons are pumped across a membrane during:
electron transport
How is the Calvin cycle connected to the light reactions?
The Calvin cycle needs ATP and NADPH produced in the light reactions
A haploid is a cell:
containing only one copy of each chromosome.
The process of programmed cell death is called:
apoptosis
Which of the following statements regarding tumor suppressor drugs and drugs developed to treat cancers resulting from oncogenes is true?
Tumor suppressors need to be reactivated, whereas oncogenes need to be switched off.
One difference between mitosis and meiosis I is that:
homologous chromosome pairs synapse during meiosis but not during mitosis.
Which of the following statements about homologous chromosome pairs is false?
They usually contain slightly different versions of the same genetic information.
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.
47
The number of chromosomes is reduced to half during:
Meiosis I only
All zygotes are:
Diploid
Asexual reproduction produces genetically identical individuals because:
no meiosis or fertilization takes place
Replication of DNA:
S phases
Includes the G1 and G2 phase:
Interphases
Occurs right after cytokinesis:
G1 phase
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 _?
- CDK
- Cyclin
How does a nucleus in G2 differ from a nucleus in G1?
The G2 nucleus has twice the amount of DNA as the G1 nucleus
If two strains of true-breeding plants that have different alleles for a certain character are crossed, their offspring are called:
the F1 generation
What are the expected genotype and Phenotype ratios for the F2 generation in a monohybrid cross?
1:2:1 and 3:1 respectively
If a trait that is not expressed in the F1 generation, the inheritance of the trait in question is an example of:
dominance and recessiveness
Which statement about an individual that is homozygous for an allele is FALSE?
Its parents were necessarily homozygous for that allele
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:
Pp
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:
the short-haired parent is heterozygous
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?
1/2 normal pigmentation, 1/2 albino pigmentation
