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Crocco's LE
Test Description: Random regent's questions
Instructions: Answer all questions to get your test result.
1) Damage to which structure will most directly disrupt water balance within a single-celled organism?
A
chorolplast
B
nucleus
C
ribosome
D
cell membrane
2) The function of most proteins depends primarily on the
A
availability of starch molecules
B
environment of the organism
C
type and order of amino acids
D
nutritional habits of the organism
3) Which procedure would most likely provide valid results in a test to determine if drug A would be effective in treating cancer in white mice?
A
injecting 1 mL of drug A into 100 white mice with cancer and 0.5 mL of drug X into 100 white mice without cancer
B
injecting 1 mL of drug A into 100 white mice with cancer and 1 mL of distilled water into another group of 100 white mice wit
C
injecting 1 mL of drug A into 100 white mice with cancer and 0.5 mL of drug X into another group of 100 white mice with cance
D
injecting 1 mL of drug A into 100 white mice with cancer
4) Chromosomes can be described as
A
large molecules that have only one function
B
coiled strands of genetic material
C
folded chains of bonded glucose molecules
D
reproductive cells composed of molecular bases
5) Which statement indicates one difference between the gene that codes for insulin and the gene that codes for testosterone in humans?
A
The gene for insulin is a sequence of five different molecular bases while the gene for testosterone is a sequence of only fo
B
The gene for insulin is replicated in vacuoles, while the gene for testosterone is replicated in mitochondria.
C
The gene for insulin has a different sequence of molecular bases than the gene for testosterone
D
The gene for insulin is turned on in liver cells, but the gene for testosterone is not.
6) Which condition would most likely upset the stability of an ecosystem
A
energy constantly entering the environment
B
a cycling of elements between organisms and the environment
C
a greater mass of animals than plants
D
green plants incorporating sunlight into organic compounds
7) Enzyme molecules normally interact with substrate molecules. Some medicines work by blocking enzyme activity in pathogens. These medicines are effective because they
A
have a shape that fits into the enzyme
B
have a shape that fits into all cell receptors
C
are the same size as the substrate molecules
D
are the same size as the enzyme
8) A child has brown hair and brown eyes. His father has brown hair and blue eyes. His mother has red hair and brown eyes. The best explanation for the child having brown hair and brown eyes is that
A
a gene mutation occurred that resulted in brown hair and brown eyes
B
gene expression must change in each generation so evolution can occur
C
cells from his mother’s eyes were present in the fertilized egg
D
the child received genetic information from each parent
9) Which substances are found on cell surfaces and respond to nerve and hormone signals?
A
subunits of DNA
B
receptor molecules
C
starches and simple sugars
D
vitamins and minerals
10) Which factor is least likely to contribute to an increase in the rate of evolution?
A
presence of genetic variations in a population
B
chromosomal recombinations
C
environmental selection of organisms best adapted to survive
D
a long period of environmental stability
*select an answer for all questions
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