Crocco's LE Question Preview (ID: 2287)
Random Regent's Questions.
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Damage to which structure will most directly disrupt water balance within a single-celled organism?
a) ribosome
b) cell membrane
c) chorolplast
d) nucleus
The function of most proteins depends primarily on the
a) type and order of amino acids
b) environment of the organism
c) availability of starch molecules
d) nutritional habits of the organism
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
b) 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
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 and 1 mL of distilled water into another group of 100 white mice wit
Chromosomes can be described as
a) large molecules that have only one function
b) folded chains of bonded glucose molecules
c) reproductive cells composed of molecular bases
d) coiled strands of genetic material
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 replicated in vacuoles, while the gene for testosterone is replicated in mitochondria.
b) The gene for insulin has a different sequence of molecular bases than the gene for testosterone
c) The gene for insulin is turned on in liver cells, but the gene for testosterone is not.
d) The gene for insulin is a sequence of five different molecular bases while the gene for testosterone is a sequence of only fo
Which condition would most likely upset the stability of an ecosystem
a) a cycling of elements between organisms and the environment
b) energy constantly entering the environment
c) green plants incorporating sunlight into organic compounds
d) a greater mass of animals than plants
Enzyme molecules normally interact with substrate molecules. Some medicines work by blocking enzyme activity in pathogens. These medicines are effective because they
a) are the same size as the enzyme
b) are the same size as the substrate molecules
c) have a shape that fits into the enzyme
d) have a shape that fits into all cell receptors
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) the child received genetic information from each parent
d) cells from his mother’s eyes were present in the fertilized egg
Which substances are found on cell surfaces and respond to nerve and hormone signals?
a) starches and simple sugars
b) subunits of DNA
c) vitamins and minerals
d) receptor molecules
Which factor is least likely to contribute to an increase in the rate of evolution?
a) presence of genetic variations in a population
b) environmental selection of organisms best adapted to survive
c) chromosomal recombinations
d) a long period of environmental stability
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