Which statement describes the fern life cycle?
a. Gametophytes originate within, and are dependent upon, sporophytes
b. Sporophytes originate within, and are dependent upon, gametophytes
c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant
d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation
e. Gametophytes are photosynthetic and partially independent from the sporophytes
ANSWER: d
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All of the following diseases have a genetic component, but which is inherited via a single gene?
1.Alcoholism 2.Alzheimer disease 3.Huntington Disease 4.Schizophrenia 5.Bipolar disorder 6.Depression
A mutation that inactivates a regulatory gene of a repressible operon in an E. coli cell would result in _____
A) continuous transcription of the structural gene controlled by that regulator B) complete inhibition of transcription of the structural gene controlled by that regulator C) irreversible binding of the repressor to the operator D) continuous translation of the mRNA because of alteration of its structure
Which sturcture makes proteins using coded instructions that come from the nucleus?
A. Golgi Apparatus B. mitochondrion C. vacuole D. ribosome
Why is it advantageous for the embryos of reptiles and birds to produce uric acid instead of ammonia?
A. Uric acid will diffuse out of the shell whereas ammonia would be trapped inside of the shell with the developing embryo. B. Uric acid is relatively nontoxic and won't harm the developing embryo as it is stored inside of the egg. Ammonia is far more toxic and could cause developmental problems if it was confined to the interior of an egg alongside of the embryo. C. Uric acid can be recycled by the developing embryo and used as an alternative source of energy. Ammonia cannot be used as an alternative source of energy. D. The uric acid can be broken down much easier than the ammonia by the excretory system of these animals.