1.) The aquatic environment in general have less variation in temperature than t
ID: 182541 • Letter: 1
Question
1.) The aquatic environment in general have less variation in temperature than terrestrial environment, this is due to:
a) water is more dense than air
b) the water's capacity of specific heat that could absorb large amount of heat energy with little change of temperature
c) uneven heating of the earth's surface
d)none of the above
2.) Stomata are____________
a.) specialized cells that regulate gas exchange in land plants
b.) unicellular protists that are the cause of harmful algal blooms, or "red tides"
c.) aquatic animals that have radial symmetry
d.) the structures that link bacterial cells during conjugation
e.) tissues that develop into sensory cells in vertebrates
3.) If three organisms are classified in the same class, then they must also be in the same:
a.) species
b.)kingdom
c.)genus
d.)order
e.) family
4.) Adapative radiation_________
a.) reduces the size of prosperous ecological communities
b.)increases extinction rates
c.) allows new species to occupy different habitats
d.) observes trends in the fossil record
5.) All new heritable forms of variation start out as
a.) a result of an indivdual's need
b.) a result of a population's need
c.) an unpredictable change in DNA
d.) independent assortment of chromosomes
e.) a direct result of the envinromental pressures, such as avoiding predators
6.) Which of the following is NOT typically a way that a bacterium acquires new genes?
a.) mutation
b)binary fission
c.)transformation
d.)conjugation
e.) transduction
7.)The underlying basis of silencing of genes via genomic imprinting is
a.) deletion of the DNA
b.) hydroxylation of the DNA
c.) deamination of the DNA
d.) methylation of the DNA
e.) carboxylation of the DNA
8.)The regulatory protein of a positive inducible operon is a (n)________,which is_____, keeping transcription normally turned______.
a.) activator;active;ON
b.) activator;inactive;OFF
c.)repressor;active;OFF
d.)repressor;inactive;ON
e.)activator;active;OFF
9.)What type of amino acid side chains are found on the surface of peripheral proteins?
a.) polar only
b.) nonpolar only
c.) hydrophilic only
d.) hydrophobic only
e.) polar and nonpolar
10.)A technique that could be used to demonstrate that Glu1 and Glut3 are overexpressed in cancer cells as compared to normal cells is
a.) DNA sequencing
b.) Mass spectrometry
c.) Western blotting
d.) Thin layer chromatography
e.) Electron microscopy
11.)A correlation coeffiecient of 0.05 for amount of coffee drank daily and incidence of cancer of observed in humans means that drinking lots of coffee protects against cancer.
A.) TRUE B.) FALSE
12.)Hardy-Weinberg equilibrium leads to fixation of the wild type and mutant recessive alleles in a 50:50 ratio in a population.
A.) TRUE B.) FALSE
13.)What is the average maximum percentage of recombinant progeny that are detected in genetic crosses, taking into account all the different types of chromosomal recombination that occur? A.) 25% B.50% C.75% D.100%
14.)In populations with a high rate of intermarriage between related individuals, such as the Ashkenazi Jewish population, the occurrence of carrier heterozygotes and individuals affected by autosomalrecessive traits is________compared to the general population.
a.) the same b.) significantly lower c.) significantly higher d.)extremely rare
Explanation / Answer
2. ANS: A. specialized cells that regulate gas exchange in land plants.
Explanation: Stomata or pores in the leaf surface are surrounded by specialized leaf cells called guard cells. Guard cells regulate the opening and closing of stomata. Stomata allow oxygen and carbon dioxide to either enter or leave the plant.
3. ANS: b. kingdom
Explanation: Ex: If two organisms are in the same ORDER, they must be in the same class, phylum & kingdom. even though the cat & the housefly have the same species group name (domestica), they CAN'T BE the same species because they are not in the same genus, family, order, etc.
categories: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
4. ANS: C. allows new species to occupy different habitats
Explanation: An adaptive radiation is a burst of evolution, creating several new species out of a single parent species.
5. ANS: c. An unpredictable change in DNA
Explanation: Genetic variation is caused by variation in the order of bases in the nucleotides in genes
6. ANS: c. Transformation
Explanation: Bacteria do not have an obligate sexual reproductive stage in their life cycle, but they can be very active in the exchange of genetic information. Bacteria acquire new genetic information (horizontal transformation).
7. ANS: d. Methylation of the DNA
Explanation: Genomic imprinting is a process of silencing genes through DNA methylation.
9. ANS: c. Hydrophilic only
Explanation: Hydrophilic or water-attracting amino acids are found in the periphery of proteins which help them in solubilizing and interacting with the cellular environment.
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